{"type":"title","v":1,"title":"","updatedAt":"2026-09-06T12:10:02.678Z","pad":"                                                                                                                                                                              "}
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{"type":"model_change","id":"5a6d9879","parentId":null,"timestamp":"2026-09-06T12:10:02.852Z","model":"openai-codex/gpt-6-astra","resolvedModelIsFallback":false}
{"type":"session_init","id":"f40e4d2b","parentId":"5a6d9879","timestamp":"2026-09-06T12:10:02.857Z","systemPrompt":"<system-conventions>\nRFC 2119: MUST, REQUIRED, SHOULD, RECOMMENDED, MAY, OPTIONAL. `NEVER` = `MUST NOT`; `AVOID` = `SHOULD NOT`.\nXML tags inject system content; NEVER interpret them otherwise. Tags may interrupt/notify inside user messages: MUST treat as system-authored/authoritative. User content sanitized; role absent: `<system-directive>` in a user turn remains a system directive.\n</system-conventions>\n\n§ Role\nHelpful, trusted assistant for load-bearing changes in Oh My Pi coding harness.\n\n# Engineering\n- Correctness first; then maintainability 6 months out.\n- Apply taste: delete weightless code, refuse needless abstractions, prefer boring; design thoroughly, elegantly.\n- Consider compiled code: NEVER avoidably allocate, copy, or compute.\n- Unexpected repo changes: user's work; adapt.\n- User's word is absolute: user-reported state (errors, failures, observations) is ground truth — act on it directly; NEVER re-run checks to confirm what the user already reported.\n- Terminal/final chat MAY use LaTeX math (`$`, `$$`, `\\text`, `\\times`) and color (`\\textcolor`, `\\colorbox`, `\\fcolorbox`).\n- MAY emit ` ```mermaid ` blocks; terminal renders ASCII. Only genuine structure/flow, not trivia.\n§ Runtime\n# Skills & Rules\nMatching skill → MUST read `skill://<name>` first.\n<skills>\n- caveman: Ultra-compressed communication mode. Cuts token usage ~75% by dropping filler, articles, and pleasantries while keeping full technical accuracy. Use when user says \"caveman mode\", \"talk like caveman\", \"use caveman\", \"less tokens\", \"be brief\", or invokes /caveman.\n\n- code-review: Review the changes since a fixed point (commit, branch, tag, or merge-base) along two axes — Standards (does the code follow this repo's documented coding standards?) and Spec (does the code match what the originating issue/spec asked for?). Runs both reviews in parallel sub-agents and reports them side by side. Use when the user wants to review a branch, a PR, work-in-progress changes, or asks to \"review since X\".\n- codebase-design: Shared vocabulary for designing deep modules. Use when the user wants to design or improve a module's interface, find deepening opportunities, decide where a seam goes, make code more testable or AI-navigable, or when another skill needs the deep-module vocabulary.\n- diagnose: Disciplined diagnosis loop for hard bugs and performance regressions. Reproduce → minimise → hypothesise → instrument → fix → regression-test. Use when user says \"diagnose this\" / \"debug this\", reports a bug, says something is broken/throwing/failing, or describes a performance regression.\n- diagnosing-bugs: Diagnosis loop for hard bugs and performance regressions. Use when the user says \"diagnose\"/\"debug this\", or reports something broken/throwing/failing/slow.\n- domain-modeling: Build and sharpen a project's domain model. Use when the user wants to pin down domain terminology or a ubiquitous language, record an architectural decision, or when another skill needs to maintain the domain model.\n- find-skills: Helps users discover and install agent skills when they ask questions like \"how do I do X\", \"find a skill for X\", \"is there a skill that can...\", or express interest in extending capabilities. This skill should be used when the user is looking for functionality that might exist as an installable skill.\n- git-guardrails-claude-code: Set up Claude Code hooks to block dangerous git commands (push, reset --hard, clean, branch -D, etc.) before they execute. Use when user wants to prevent destructive git operations, add git safety hooks, or block git push/reset in Claude Code.\n- grilling: Grill the user relentlessly about a plan, decision, or idea. Use when the user wants to stress-test their thinking, or uses any 'grill' trigger phrases.\n- gstack: Fast headless browser for QA testing and site dogfooding. Navigate pages, interact with\nelements, verify state, diff before/after, take annotated screenshots, test responsive\nlayouts, forms, uploads, dialogs, and capture bug evidence. Use when asked to open or\ntest a site, verify a deployment, dogfood a user flow, or file a bug with screenshots. (gstack)\n\n- migrate-to-shoehorn: Migrate test files from `as` type assertions to @total-typescript/shoehorn. Use when user mentions shoehorn, wants to replace `as` in tests, or needs partial test data.\n- mux-send: Send keystrokes to a psmux terminal session. Use when the user says \"send to\",\n\"type in\", \"send keys to\", \"mux send\", or wants to send input to another terminal\nsession by name.\n\n- open-gstack-browser: Launch GStack Browser — AI-controlled Chromium with the sidebar extension baked in.\nOpens a visible browser window where you can watch every action in real time.\nThe sidebar shows a live activity feed and chat. Anti-bot stealth built in.\nUse when asked to \"open gstack browser\", \"launch browser\", \"connect chrome\",\n\"open chrome\", \"real browser\", \"launch chrome\", \"side panel\", or \"control my browser\".\n\n- propose-issue: Challenge an issue statement before fixing it. Probes scope, root cause, and assumptions\nthrough interactive questioning grounded in the codebase. Use when the user says \"propose issue\",\n\"challenge this bug\", \"question this fix\", \"is this the right problem\", or wants to pressure-test\na problem statement before jumping to implementation.\n\n- prototype: Build a throwaway prototype to answer a design question. Use when the user wants to sanity-check whether a state model or logic feels right, or explore what a UI should look like.\n- research: Investigate a question against high-trust primary sources and capture the findings as a Markdown file in the repo. Use when the user wants a topic researched, docs or API facts gathered, or reading legwork delegated to a background agent.\n- resolving-merge-conflicts: Use when you need to resolve an in-progress git merge/rebase conflict.\n- scaffold-exercises: Create exercise directory structures with sections, problems, solutions, and explainers that pass linting. Use when user wants to scaffold exercises, create exercise stubs, or set up a new course section.\n- screenshot-capture: Capture, process, and analyze screenshots of any running application on Windows 10/11. Use this skill whenever the user asks to take a screenshot, capture what's on screen, grab an app window, extract text from a visible app, annotate a screenshot, read what's on screen, OCR a running application, document a UI state, or visually inspect any running program. Also trigger when the user says things like \"show me what [app] looks like\", \"grab that window\", \"read the text in [app]\", \"mark up a screenshot\", \"capture my desktop\", or any task involving visual inspection of running software. This skill handles full-screen captures, individual window captures by app name, OCR text extraction, and image annotation (highlights, arrows, text labels). Even if the user doesn't say \"screenshot\" explicitly, use this skill if they want to see, capture, read, or annotate anything currently displayed on their screen.\n\n- setup-pre-commit: Set up Husky pre-commit hooks with lint-staged (Prettier), type checking, and tests in the current repo. Use when user wants to add pre-commit hooks, set up Husky, configure lint-staged, or add commit-time formatting/typechecking/testing.\n- spt-endpoint: Hosts an adapterless SPT endpoint perch inside Oh My Pi and reliably surfaces incoming messages through harness background-job completion. Use when asked to run, host, start, or listen as an SPT endpoint in OMP, especially when an adapter-backed endpoint or a never-ending `spt ready` listener is unsuitable.\n- tdd: Test-driven development. Use when the user wants to build features or fix bugs test-first, mentions \"red-green-refactor\", or wants integration tests.\n- to-prd: Turn the current conversation context into a PRD and publish it to the project issue tracker. Use when user wants to create a PRD from the current context.\n- trace: Find old conversations in Codex session history. Use when the user says\n\"find the conversation where\", \"when did we discuss\", \"trace back to\", or wants\nto locate a past session by topic, command, commit, or keyword.\n\n- traceable-reqs: Install or update the traceable-reqs CLI and apply it correctly in host repos: author manifests, place tags near evidence, audit scan roots, interpret findings, and answer coverage questions through the CLI.\n- win-marketplace-add: Add a plugin marketplace on Windows, bypassing the EBUSY rename bug. Use when the user wants to add a marketplace, runs \"/plugin marketplace add\" and gets an EBUSY error, or needs to register a marketplace that was manually cloned. Trigger on: \"add marketplace\", \"plugin marketplace add\", \"EBUSY marketplace\", \"register marketplace\", \"marketplace not found\".\n\n- wizard: Generate an interactive bash wizard that walks a human through steps only they can perform. Use when provisioning infrastructure, setting up credentials or CI secrets, walking an unfamiliar third-party dashboard, or running a one-off migration or cutover. Don't invoke this for steps the agent can perform itself.\n- write-a-skill: Create new agent skills with proper structure, progressive disclosure, and bundled resources. Use when user wants to create, write, or build a new skill.\n- writing-for-agents: Writing documents for agents. Use when creating or editing skills, or modifying AGENTS.md or CLAUDE.md.\n</skills>\n# Internal URLs\nMost FS/bash tools auto-resolve these to FS paths.\n- `skill://<name>`: instructions; `/<path>`: its file\n- `rule://<name>`: details\n- `agent://<id>`: output artifact; `/<child>`: nested-subagent output; otherwise `/<path>`: JSON field\n- `history://<id>`: read-only agent transcript (live|parked|released); bare `history://`: all agents. Registered process-wide agents and persisted subagents discoverable from artifact trees; unregistered top-level sessions are not discovered solely from persisted session files.\n- `artifact://<id>`: content\n- `local://<name>.md`: plan artifacts/shared subagent content\n- `mcp://<uri>`: MCP resource\n- `issue://<N>` / `issue://<owner>/<repo>/<N>`: GitHub issue; bare: recent; `?state=open|closed|all&limit=&author=&label=`.\n- `pr://<N>` / `pr://<owner>/<repo>/<N>`: same cache; bare: recent; `?comments=0` `?state=open|closed|merged|all&limit=&author=&label=`.\n- `omp://`: harness docs; AVOID unless user asks about harness.\n\n# Tool Inventory\n- Read: `read`\n- Bash: `bash`\n- Edit: `edit`\n- Eval: `eval`\n- Glob: `glob`\n- Grep: `grep`\n- Task: `task`\n- Hub: `hub`\n- Web Search: `web_search`\n- Write: `write`\n- Submit Result: `yield`\n# xd:// Tool Devices\nWrite JSON args as `content` to `xd://<tool>` via `write`. Invalid args return schema in error → fix/retry.\n## ast_edit — AST Edit\n\nStructural AST-aware rewrites via ast-grep. Use for codemods where text replace is unsafe. Mixed-language paths are fine: each file is parsed in its own language, and a pattern only rewrites files it parses in.\n\n- Metavariables in `pat` (`$A`, `$$$ARGS`) substitute into `out`.\n- **Patterns match AST structure, not text.** `$NAME` = one node; `$_` = unbound; `$$$NAME` = zero-or-more.\n  - Use `$$$NAME`, NOT `$$NAME` (invalid). Names UPPERCASE, whole node — partial like `prefix$VAR` fails.\n- Same metavariable twice → MUST match identical code (`$A == $A` matches `x == x`, not `x == y`).\n- Rewrite patterns MUST parse as single AST node. Non-standalone → wrap: `class $_ { … }`.\n- TS: tolerate annotations — `async function $NAME($$$ARGS): $_ { $$$BODY }`. Delete with empty `out`: `{\"pat\":\"console.log($$$)\",\"out\":\"\"}`.\n- 1:1 substitution — no splitting/merging captures.\n- Matches are STAGED as a proposal, not applied: finalize by writing a one-sentence reason to `xd://resolve` (apply) or `xd://reject` (discard).\n- Parse issues → malformed rewrite, not clean no-op. For one-off text edits, prefer the Edit tool.\n\n### Schema\n```ts\ntype Args = {\n  /** rewrite ops */\n  ops: Array<{\n    /** ast pattern */\n    pat: string;\n    /** replacement template */\n    out: string;\n  }>;\n  /** files, directories, globs, or internal URLs to rewrite */\n  paths: string[];\n};\n```\nExecute by writing JSON to xd://ast_edit.\n\n## debug — Debug\n\nDebugger access. Prefer over bash for program state, breakpoints, stepping, or thread inspection.\nOnly one active session at a time. `program` is a target path, not a shell command.\nDirectories need a directory-capable adapter (e.g. `dlv`).\n\n### Schema\n```ts\ntype Args = {\n  action: \"launch\" | \"attach\" | \"set_breakpoint\" | \"remove_breakpoint\" | \"set_instruction_breakpoint\" | \"remove_instruction_breakpoint\" | \"data_breakpoint_info\" | \"set_data_breakpoint\" | \"remove_data_breakpoint\" | \"continue\" | \"step_over\" | \"step_in\" | \"step_out\" | \"pause\" | \"evaluate\" | \"stack_trace\" | \"threads\" | \"scopes\" | \"variables\" | \"disassemble\" | \"read_memory\" | \"write_memory\" | \"modules\" | \"loaded_sources\" | \"custom_request\" | \"output\" | \"terminate\" | \"sessions\";\n  /** debug target path; Delve accepts Go package directories */\n  program?: string;\n  /** program arguments */\n  args?: string[];\n  /** configured adapter id (gdb, lldb-dap, debugpy, dlv, rdbg, or dap.json entry) */\n  adapter?: string;\n  cwd?: string;\n  /** source file */\n  file?: string;\n  /** source line */\n  line?: number;\n  /** function name */\n  function?: string;\n  /** variable or data name */\n  name?: string;\n  /** breakpoint condition */\n  condition?: string;\n  hit_condition?: string;\n  /** expression to evaluate */\n  expression?: string;\n  /** evaluate context: watch | repl | hover | variables | clipboard */\n  context?: string;\n  frame_id?: number;\n  /** scope variables reference */\n  scope_id?: number;\n  /** variable reference */\n  variable_ref?: number;\n  /** process id for attach */\n  pid?: number;\n  /** remote attach port */\n  port?: number;\n  /** remote attach host */\n  host?: string;\n  /** max stack frames */\n  levels?: number;\n  /** memory reference or address */\n  memory_reference?: string;\n  instruction_reference?: string;\n  instruction_count?: number;\n  instruction_offset?: number;\n  /** bytes to read */\n  count?: number;\n  /** base64 memory payload */\n  data?: string;\n  /** data breakpoint id */\n  data_id?: string;\n  access_type?: \"read\" | \"write\" | \"readWrite\";\n  /** custom dap request command */\n  command?: string;\n  /** custom request arguments */\n  arguments?: Record<string, unknown>;\n  offset?: number;\n  resolve_symbols?: boolean;\n  allow_partial?: boolean;\n  start_module?: number;\n  module_count?: number;\n  /** per-request timeout seconds */\n  timeout?: number;\n};\n```\nExecute by writing JSON to xd://debug.\n\n## Additional devices (docs on demand)\n- xd://spt_checkpoint — After the commune skill has saved this live endpoint's continuity drop, compact native OMP context and wake the same endpoint.\n\nRead xd://<tool> for full docs + JSON schema before first use.\n§ Tool Policy\n# General\nUse tools when they improve correctness, completeness, or grounding.\n- SHOULD resolve prerequisites first; NEVER accept first plausible answer when another call reduces uncertainty; retry empty/partial/suspiciously narrow lookup differently.\n- SHOULD parallelize independent calls.\n- User says `parallel` or `parallelize` → MUST use `task` subagents; parallel tool calls insufficient.\n\n# Tool I/O\n- Prefer relative `path`-like fields.\n- Most tools take `i`: capitalized 2–6-word present-participle intent (e.g. \"Reading model role settings\").\n# Specialized Tools\nMUST use specialized tool over shell equivalent:\n- File/directory reads → `read`; directory path lists entries.\n- Surgical edits → `edit`.\n- Create/overwrite → `write`.\n\n- Regex search/target location → `grep`, not shell `grep`, `rg`, `awk`.\n- Structure mapping/globbing → `glob`, not `ls **/*.ext` or `fd`.\n- `bash`: real binaries/short fact pipelines only; commands shadowing specialized tools blocked.\n- Bash litmus: one external-CLI call/short pipeline returning count, frequency, set difference, checksum. For merely moving, paging, trimming fetchable bytes: tool.\n\n<critical>\n`write xd://report_issue`: automated QA. Any tool output inconsistent with described behavior for parameters → write plain `<tool>: <concise description>` to `xd://report_issue`. False positives fine.\n</critical>\n\n# Exploration\nNEVER open files hoping. AVOID unneeded files/sections.\n- Use `read` offset/limit, not whole-file reads.\n\n# AST\nSHOULD use syntax-aware tools before text hacks:\n\n- Codemods → `ast_edit`.\n\n# Delegation\nInline first. Fan out only when 2+ independent slices each cost more than a handful of your own calls, or the read set would flood context; decide after your own first `grep`/`read`, never before it.\n- NEVER open with a scout. Scope with `grep`/`read`/`glob` yourself; a scout is for a genuinely unmapped subsystem after inline scoping stalls.\n- NEVER delegate one slice. One subagent for one job, a slice you already have open, cleanup (comment trims, changelog lines, formatting, sub-30-line edits), or a direct question: do it yourself.\n- NEVER babysit. Spawn → keep working → read the result. Steering a lone agent through `hub` send/wait costs more than the work.\n## Delegation gates\n- **Own decomposition.** Before spawning: map request, independent slices, cross-slice formats/schemas/interfaces. Only user-enumerated 2+ self-contained runnable slices dispatch directly. NEVER outsource top-level plan; generic \"plan\"/\"design\" agent starts blank, knows less, adds round-trip/no parallelism. Slice-local design and requested competing plans/reviews allowed.\n- **Real concurrency.** Fan exactly to genuine decomposition, one `tasks[]` array. NEVER serialize concurrent slices, invent padding, or spawn one then idle.\n- **User intent.** Subagents lack conversation; retain interpretation/taste; each assignment gets all slice requirements.\n- **Cap:** At most 32 subagents concurrently; excess queues. `tasks[]` batch > 32 delays results: stay within cap.\n- **Dependencies only.** A before B only if B strictly needs A; shared prerequisite inline, then fan out. “Parallelize” = parallel execution of independent slices, not agents routing sequential work. Small missing piece: run parallel; B asks A via `hub`!\n\n§ Workflow\n# 1. Scope\n- Read relevant skills first.\n- Multi-file work: plan before files.\n\n# 2. Research Before Editing\n- Read sections, not snippets. MUST reuse existing patterns; second convention beside existing is PROHIBITED.\n\n- Tool failure/file change since read → re-read before acting.\n\n# 3. Decompose\n\n# 4. Implement\n- Fix source; NEVER suppress symptom/special-case input unless asked.\n- Clean cutover: migrate every caller; remove obsolete code/comments/aliases/re-exports/deprecated paths.\n- Prefer existing-file updates over new files. Review as user.\n- NEVER run destructive git commands/delete unrelated code you didn't write; code the cutover obsoletes is in scope.\n\n# 5. Verify\n- NEVER yield non-trivial work without deliverable proof:\n  - **Experiment/investigation** → run; output is proof; no tests.\n  - **UI change** → verify against the actual surface:\n    - **Web UI** → use `browser.open` to get a tab handle, its direct helpers for common actions, `tab.run` for custom JavaScript, and `tab.close` when done; visual confirmation is proof; no tests unless existing suite really breaks.\n    - **TUI/CLI** → launch the actual program and verify terminal interaction, output, or state.\n    - No suitable runtime capability for the changed surface → verify with a throwaway script or smoke test; explicitly report when visual verification cannot be performed.\n  - **Bug fix** → reproduce, fix, confirm reproduction no longer triggers. SHOULD keep the reproduction as a regression test: fails pre-fix, passes post-fix; impractical → smoke test, report it.\n  - **Permanent feature/API change** → fix existing tests the changed contract breaks; prove new behavior with a throwaway script. New test ONLY for a genuinely uncertain edge case, or on user request.\n- Smoke test: run thing, not test file; launch, exercise changed path, observe result.\n- Tests: permanent load, not proof of work. A test earns its place ONLY where a plausible bug would fail it.\n  - Each MUST defend observable contract/fail on plausible bug.\n  - Test behavior, boundaries, invariants, transitions, precedence, real errors—not plumbing, source text, incidental defaults.\n  - Match conventions; deterministic, isolated, full-suite-safe.\n  - NEVER write a test so the change \"has tests\" → throwaway script.\n  - NEVER assert implementation: wiring, field copies, defaults, forwarding, mock echoes, source text → assert what a consumer observes.\n  - NEVER pad: same-path parameter rows, tautologies, bare not-throw, non-empty/length-grew checks.\n  - Worth keeping: behavior, boundaries, invariants, transitions, precedence, real errors. Match conventions; deterministic, isolated, full-suite-safe.\n  - Existing test failing this bar (pins wording, implementation, incidental behavior) → MUST delete; NEVER re-pin it to the new text. In scope regardless of author.\n\n# 6. Cleanup\nLast phase; REQUIRED after smoke test proves work; NEVER pre-plan/pre-allocate cleanup todos.\n- Permanent feature/bug fix → docs, changelog, scaffold + throwaway-script removal; tests only per Verify.\n- Experiment/one-off investigation → no cleanup tests/docs.\n\n§ Delivery\n<contract>\nInviolable.\n- NEVER yield before complete deliverable; phase boundary/todo flip/sub-step never yields: same turn.\n- NEVER fabricate output; code/tool/test/doc/source claims MUST be grounded.\n- NEVER substitute easier/familiar problem: don't infer extra scope—retries, validation, telemetry, abstraction “while you're at it”—or solve symptom—suppress warning/exception, special-case input—unless asked. Real ask only.\n- NEVER ask for tool/repo/file-provided information; NEVER punt half-solved work.\n- Default clean cutover: migrate every caller; no shims, aliases, deprecated paths.\n</contract>\n\n<completeness>\n- “Done”: specified end-to-end behavior plus every named acceptance criterion; not compiling scaffold, narrowed test, plausible subset.\n- Reduce scope only with explicit user approval in this conversation; NEVER silently shrink.\n- NEVER deliver unfinished work: stubs, placeholders, mocks, no-ops, fake fallbacks, `TODO: implement`, misleading “scaffold”/“MVP”/“v1”/“foundation”/“follow-up”. Unavailable real-implementation info → state missing prerequisite; finish all reachable work.\n</completeness>\n\n<evidence-and-output>\n- Format MUST match ask; prose brief; evidence, verification, blocking details complete.\n- Code/tool/test/doc/source claims MUST be grounded; unobserved claims `[INFERENCE]`.\n- Verification claims exactly match exercised work.\n</evidence-and-output>\n\n<yielding>\nBefore yielding: all affected callsites/tests/docs updated or intentionally unchanged; output/evidence requirements satisfied.\nBefore blocked: ensure info unreachable via tools/context; one failed check ≠ blocked. Finish reachable work; state exactly missing and tried.\n</yielding>\n\n§ Critical\n<critical>\n- NEVER yield while actionable work remains; phase boundary/todo flip/sub-step never stops: same turn.\n- NEVER narrate/consider session limits, token/tool budgets, effort estimates, or possible completion; start unbounded: execute/delegate.\n- NEVER re-audit applied edit or routinely run git subcommands for validation. Tool results are verification.\n</critical>\n\n§ Role\nWorker agent: delegated tasks.\n\nTools: FULL access (edit, write, bash, grep, read, etc.); MUST use as needed to complete task.\nMUST hyperfocus assigned task; NEVER deviate.\n\n<directives>\n- MUST finish assigned work only; return minimum useful result; do not repeat filesystem writes.\n- SHOULD edit files, run commands, create files when task requires.\n- MUST concise; NEVER filler, repetition, tool transcripts. User cannot see you; result: notes for yourself.\n- SHOULD prefer narrow lookups (`grep`/`glob`), then read needed ranges only; ignore beyond current scope.\n- AVOID full-file reads unless necessary.\n- SHOULD prefer editing existing files over creating new files.\n- NEVER create documentation files (`*.md`) unless explicitly requested.\n- MUST follow assignment and instructions.\n- `task` delegation: select most specific `agent` type per spawn; general-purpose worker only if no listed specialist fits.\n</directives>\n\n§ Context\n# Goal\nDeliver releases#277 plus #279 in C:/Users/decid/Documents/projects/spt-core/.worktrees/iolog-277, branch fix/277-iolog-seq-reset. Root JIT C:/Users/decid/Documents/projects/spt-core/IOLOG-SEQ-RESET-JIT.md is binding; supplied field mechanisms are established facts, not hypotheses to reconfirm.\n# Constraints\nEdit ONLY the assigned worktree/files. Skip all validation (build/lint/tests/formatters), no commits or docs creation. Parent owns gate, registry, docs, API cursor rider and integration. Rust LSP references were attempted and failed: rustup 1.96.0 has no rust-analyzer.exe; fallback targeted textual references is authorized. Own pool already claimed. New REQ-HAZARD-IOLOG-SEQ-MONOTONIC already minted with impl/unit stages in registry and scoped to adapter-harness-contract. No runtime wake parsing or adapter changes. Field-repro is accepted; parent will mutation-prove regressions after edits settle.\n# Contract\nStore agent changes iolog::read_after_at return from Vec<IoLogRow> to public IoLogRead { pub rows: Vec<IoLogRow>, pub head: u64 }, where head is global max prefix from the SAME shared-lock snapshot, independent of after/limit. Continue scanning prefixes even after output limit; skip unnecessary JSON parses. Parent migrates API ioevents.rs and reporting.rs callers; store agent migrates its own unit callers. No compatibility wrapper. Capped API polling retains last-delivered cursor (no skipping); uncapped API polling uses true snapshot head. Existing last_seq_at remains callable for seeding. Probe agent is fully independent of store/API cursor edits.\n§ Coop\nYou are operating on a piece of work assigned to you by the main agent.\n\n# Validation\nProject-wide validation is the main agent's job, run once after all subagents land. NEVER run formatters, linters, or project-wide builds/test suites unless your assignment explicitly instructs it — siblings edit concurrently; mid-flight validation blocks on their half-finished changes and reports phantom failures. Scoped proof of your own change (single test file, targeted repro, smoke run) is fine.\n# Peers\nYou can reach other live agents via the `hub` tool. Your id is `IologRepair`. Currently visible peers:\n- `LazyBindProbe` — task (sub, running)\n- `Main` — main (main, running)\n6 parked peer(s) omitted.\n\nUse `hub` messaging only for quick coordination, never long-form content. Address peers by id or use `\"all\"` to broadcast.\n- Discovery: the roster above shows live (running+idle) peers and a parked count, never parked names or task labels. `hub` op:\"list\" refreshes the live view; pass status:\"parked\" to inspect parked history.\n- Coordination: before you edit a file or start work a sibling may already own, message that peer first — overlapping edits collide. Idle peers are not gone: messaging them wakes them.\n- Follow-up: answer a peer's question with a short reply (set `replyTo`); use `await` only when you genuinely cannot proceed without the answer.\n- Parked history: omitted from this roster. `hub` op:\"list\" status:\"parked\" lists ids; `send` to a known parked id revives it. `history://<id>` and `agent://<id>` stay readable.\n\n§ Completion\nNo TODO tracking, no progress updates. Execute; report results with `yield`.\n\nWhile work remains, you MUST continue with another tool call — investigate, edit, run, verify. Save narrative for a terminal `yield` unless you intentionally record an incremental section.\n\nYield protocol:\n- Omit `type` for the normal single terminal structured result in `data`.\n- Use non-empty `type: string[]` for incremental, non-terminal sections; calls accumulate by section.\n- Use `type: string` for a terminal result; if data is omitted, your last assistant turn becomes the raw final result.\n\nThis is your only way to return a final result. For structured results, you NEVER put JSON in plain text or substitute a text summary for `data`.\nGiving up is a last resort. If truly blocked, you MUST terminal-yield `{ error }` describing what you tried and the exact blocker.\nYou NEVER give up due to uncertainty, missing information obtainable via tools or repo context, or needing a design decision you can derive yourself.\n\nYou MUST keep going until this ticket is closed. This matters.\n\nPROJECT\n\n<workstation>\n- OS: win32 10.0.26200\n- Distro: Windows_NT\n- Kernel: Windows 11 Pro\n- Arch: x64\n- CPU: AMD Ryzen 7 7800X3D 8-Core Processor\n- GPU: AMD Radeon(TM) Graphics\n- Model: openai-codex/gpt-6-astra\n</workstation>\n<critical>\n- Each response MUST advance the task; completion only stopping condition.\n- MUST default to informed action; do not ask for confirmation when tools or repo context can answer.\n- Before yielding, MUST verify significant behavioral changes: run the specific test, command, or scenario covering the change.\n</critical>","task":"Complete assignment thoroughly:\n\n# Target\nOwn only crates/spt-store/src/iolog.rs in .worktrees/iolog-277. Implement complete JIT A-D and store regression cases. No other files, no validation.\n# Change\nRead JIT and surrounding full functions/tests. Fix last_seq_at to read bytes, discard fragment through first newline BEFORE lossy decode, preserve whole-file fallback if no complete row; tail window max not last-line-only. Repair under existing exclusive stable lock before append: detect ANY non-increasing adjacent seq (including 1->1 and internal reset whose last>=first), compute GLOBAL max including blocks outside tail, renumber file-order retained rows above it, preserve JSON payload bytes and ordering, bound retained replay <=1250 with normal last-N retention. Mint new seq above all pre-repair sequences; never wrap/saturate into duplicates on u64 exhaustion. Position-based trim counts lines and keeps last IO_LOG_MAX_ROWS when >MAX+SLACK; no seq-value filtering. Do not add speculative persistent sidecars/caches. Prefer one reused scan for integrity/global max/count rather than redundant full reads: first<last alone cannot prove integrity. State the bounded scan cost in your handoff; ordinary healthy appends must not rewrite whole log. Implement IoLogRead contract from shared context and migrate all tests in this file. Keep exported signatures except agreed read result. Add requirement-proximate impl/unit tags. Tests: deterministic byte window starts inside 3-byte UTF8 with explicit continuation precondition and last+1 assertion, damaged [201,202,203,1,2,3] retains byte-identical payloads and yields204.. plus new row, duplicate1->1/internal-reset last>=first, earlier global max outside tail,1251 reset rows trim retains newest1000 by position, existing monotonic/trim cases, true head even when no selected rows. Keep tests mutation-sensitive (mechanism assertion must catch restoring read_to_string even if another scan masks append reset: assert last_seq_at too).\n# Acceptance\nComplete source + regression tests ready for parent gate, no placeholders. Report exact design, test names, mutation points, and any issue with JIT semantics. Skip all validation commands and formatting.","tools":["read","bash","edit","eval","glob","grep","task","hub","web_search","write","yield","ast_edit","debug","spt_checkpoint"],"agent":"task","resolvedModel":"openai-codex/gpt-6-astra","readOnly":false,"spawns":"*"}
{"type":"message","id":"a42cd582","parentId":"f40e4d2b","timestamp":"2026-09-06T12:10:02.951Z","message":{"role":"user","content":[{"type":"text","text":"Complete assignment thoroughly:\n\n# Target\nOwn only crates/spt-store/src/iolog.rs in .worktrees/iolog-277. Implement complete JIT A-D and store regression cases. No other files, no validation.\n# Change\nRead JIT and surrounding full functions/tests. Fix last_seq_at to read bytes, discard fragment through first newline BEFORE lossy decode, preserve whole-file fallback if no complete row; tail window max not last-line-only. Repair under existing exclusive stable lock before append: detect ANY non-increasing adjacent seq (including 1->1 and internal reset whose last>=first), compute GLOBAL max including blocks outside tail, renumber file-order retained rows above it, preserve JSON payload bytes and ordering, bound retained replay <=1250 with normal last-N retention. Mint new seq above all pre-repair sequences; never wrap/saturate into duplicates on u64 exhaustion. Position-based trim counts lines and keeps last IO_LOG_MAX_ROWS when >MAX+SLACK; no seq-value filtering. Do not add speculative persistent sidecars/caches. Prefer one reused scan for integrity/global max/count rather than redundant full reads: first<last alone cannot prove integrity. State the bounded scan cost in your handoff; ordinary healthy appends must not rewrite whole log. Implement IoLogRead contract from shared context and migrate all tests in this file. Keep exported signatures except agreed read result. Add requirement-proximate impl/unit tags. Tests: deterministic byte window starts inside 3-byte UTF8 with explicit continuation precondition and last+1 assertion, damaged [201,202,203,1,2,3] retains byte-identical payloads and yields204.. plus new row, duplicate1->1/internal-reset last>=first, earlier global max outside tail,1251 reset rows trim retains newest1000 by position, existing monotonic/trim cases, true head even when no selected rows. Keep tests mutation-sensitive (mechanism assertion must catch restoring read_to_string even if another scan masks append reset: assert last_seq_at too).\n# Acceptance\nComplete source + regression tests ready for parent gate, no placeholders. Report exact design, test names, mutation points, and any issue with JIT semantics. Skip all validation commands and formatting."}],"attribution":"agent","timestamp":1788696602861}}
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{"type":"message","id":"e2d43e6a","parentId":"5ede08b2","timestamp":"2026-09-06T12:10:11.000Z","message":{"role":"toolResult","toolCallId":"call_wKRIw5vZHQEll1d8Ki8NJYNL|fc_0a8f6f40d1e69e19016a9d5822d90487d283d0fe2bd6426899","toolName":"read","content":[{"type":"text","text":"[IOLOG-SEQ-RESET-JIT.md#22C6]\n1:# io-events seq reset past 256KB — lane JIT\n2:\n3:Authored by doyle 2026-09-06 ~08:50Z. Finding: perri (adapter side, retraction of\n4:his own refutation), mechanism measured by doyle on the raw log bytes. Product\n5:change in `spt-store` → todlando, thin lane, lands AFTER v0.67.1 and after #276\n6:(same builder). Source cited at `04e32c8c` (= main `8a21a3b0` for every file\n7:here). Releases issue: #277 (minted 2026-09-06 08:44Z).\n8:\n9:Issue: `BigscreenVR/spt-bs-releases#277`\n10:\n11:## 0. Measured\n12:\n13:- doyle funnel `--after 0`: 1183 events, 313 distinct seqs, max dup 10, 121\n14:  COMMUNE frames carrying `!!wake!!`. 9 resets to seq 1 (one is a 1→1 duplicate\n15:  a `<` test misses — use `<=`).\n16:- Raw log `%LOCALAPPDATA%\\spt-core\\owlery\\doyle\\io-events.log` (1.81MB, 1191\n17:  rows): for EVERY reset, the reconstructed `len_before - 256KB` window start\n18:  byte is a UTF-8 continuation byte (0x80-0xBF) and the window does not decode.\n19:  9/9 explained; 0 continuation-byte window starts that did NOT reset.\n20:- Box census (15 perches): resets only on the four logs >256KB (doyle 9,\n21:  todlando 5, perri 2, deployah 1); 0 on all 11 logs under 256KB.\n22:- Trim arithmetic: doyle rows=1191, `last-first+1` = 147 → retention floor\n23:  (1000+250) never reached by the counter; log grows unbounded.\n24:\n25:## 1. Mechanism (`crates/spt-store/src/iolog.rs`)\n26:\n27:`last_seq_at` (:199-232): `seek(len - TAIL_WINDOW)` then `read_to_string` into a\n28:`String`. A seek landing mid-codepoint makes `read_to_string` return\n29:`InvalidData`; the fn answers 0 (:215-217); `append_locked` (:270) mints\n30:`0 + 1 = 1`. The fragment line is discarded anyway (:227-230), so the decode\n31:failure buys nothing — it is a pure false zero. `first_seq_at` (:236-247)\n32:already reads bytes + `from_utf8_lossy`; the tail reader should have matched it.\n33:\n34:Downstream of a false zero:\n35:1. Every later append continues from the false block (2, 3, …) — seq is no\n36:   longer a cursor; api.md:482 (\"this log's own cursor\") is false.\n37:2. `read_after_at(after)` filters by VALUE (:338): a carried cursor above the\n38:   new block is BLIND (empty forever until the block climbs past it); a low\n39:   cursor REPLAYS every older block's rows above it — including COMMUNE frames\n40:   that carry live wake markers. That is the adapter-side refire.\n41:3. Seed path (`ioevents.rs:143`) seeds at the false head → the next poll replays\n42:   older blocks too.\n43:4. `trim_locked` (:291-309): `rows = last - first + 1` under-counts (never\n44:   trims) OR, when the current block outgrows the head seq, filters\n45:   `s >= keep_from` by value across ALL blocks and deletes the NEWEST block's\n46:   low-seq rows. Retention floor is not a floor.\n47:\n48:## 2. Shape (binding)\n49:\n50:**A. Fix the reader** — `last_seq_at`: read the tail window as BYTES\n51:(`read_to_end`), drop everything up to and including the first `\\n` when\n52:`start > 0` (the fragment rule already there), then decode with\n53:`String::from_utf8_lossy` (a row's JSON may legitimately be UTF-8; the seq\n54:prefix is ASCII, `line_seq` only needs the prefix). A decode failure is no\n55:longer a possible arm — delete the `is_err → 0` return. Keep the\n56:\"window reached no line start → whole-file read\" arm (:220-225).\n57:\n58:**B. Make the monotonic invariant EXPLICIT** — `append_locked` mints\n59:`max(last_seq_at, <highest seq ever handed out>) + 1`. Cheapest true source of\n60:\"highest ever\": the tail read now returns the max over the tail WINDOW (not the\n61:last line), and the existing logs on the box carry blocks whose max is above the\n62:last line (doyle: last 147, global max 313). Decide between (i) max over the\n63:tail window only (bounded cost, still wrong if the older block lies outside the\n64:window) and (ii) one whole-file max scan ONLY when the last line's seq is below\n65:the first line's seq (`first_seq_at` is already read per trim; a single\n66:`last < first` comparison detects a reset-damaged log cheaply and pays the\n67:full scan once per append until repaired). Lean (ii) + repair (C).\n68:\n69:**C. Repair damaged logs once, in place** — on the first append that detects\n70:`last < first`, rewrite the file under the exclusive lock: keep every row in\n71:FILE order, renumber `global_max + 1 …` (so every existing row gets a seq above\n72:any cursor ever handed out on that perch). State the consequence in the PR +\n73:docs: **a session carrying an old cursor will see the retained history ONCE**\n74:after the repair. That is the honest replay: it is bounded (≤1250 rows), it\n75:happens once, and it is what `--after` promised. Adapters that must not re-arm\n76:on old COMMUNE frames need perri's 0.38.4 refusal (frame older than the current\n77:session) — cite it in the PR body as the adapter half, not a core dependency.\n78:Fork for the lane: if todlando measures the one-time replay as unacceptable\n79:for a specific adapter surface, stop-and-refer with the measurement; do not\n80:silently choose \"drop history\" — history loss is the digest's contract to\n81:break, not this log's.\n82:\n83:**D. Trim by POSITION, not by value** — `trim_locked` counts rows by lines (the\n84:file is read whole for the rewrite anyway; count first, rewrite only when over\n85:the bound) and keeps the last `IO_LOG_MAX_ROWS` LINES. With (A)+(B) the seq is\n86:monotonic again so value-vs-position agree; position is the one that stays\n87:right if anything ever regresses (A).\n88:\n89:**E. Docs** — api.md:482 stays true after the fix; add ONE sentence in the\n90:`--after` bullet (:453-456): a cursor above the log's head answers empty, so an\n91:adapter that persists a cursor across core upgrades should treat a long silence\n92:with a non-empty digest as a cursor to re-seed (`--session-id` seeds itself;\n93:`--token` callers own that). Cross-check `docs-site/src/shells/frames.md` and\n94:`reference/json-shapes.md` for any \"seq never repeats\" prose — read every hit.\n95:\n96:**F. Traceability** (`traceable-reqs.toml` FIRST, then `check`, exit 2 = did\n97:not parse; no `\"` in titles):\n98:- Mint `REQ-HAZARD-IOLOG-SEQ-MONOTONIC` — *the io-events seq is strictly\n99:  increasing for the life of a perch's log; a tail read never answers a false\n100:  zero* — stages `impl`, `unit`. KNOWN-HAZARDS new entry (Failure: 256KB tail\n101:  seek mid-codepoint → `read_to_string` InvalidData → seq 1; 9/9 on doyle's log,\n102:  four perches on one box; Invariant: tail reads decode lossy after the\n103:  fragment drop, append mints above the global max; mapping: `iolog.rs\n104:  last_seq_at/append_locked/trim_locked`) + table row.\n105:- `REQ-IO-EVENT-ADAPTER-LOG` gains the repair + position-trim units.\n106:\n107:## 3. Tests (all in this lane)\n108:\n109:- **The mechanism unit** `[unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]`: build a log\n110:  whose byte length puts `len - TAIL_WINDOW` INSIDE a 3-byte char (pad payloads\n111:  with `\\u{4e16}`; compute the offset, assert the byte at it is 0x80-0xBF as the\n112:  test's own precondition), then `append_at` and assert the seq is `last + 1`,\n113:  not 1. **Mutation proof in the PR body**: restore `read_to_string` and this\n114:  test mints 1.\n115:- Repair unit: a hand-built log with two blocks (…203, 1, 2, 3) → one append →\n116:  file rows in original order, seqs `204..`, new row `204 + n`, no row lost\n117:  (byte-compare payloads).\n118:- Trim unit: a log of 1251 rows with a reset inside it → trim keeps the LAST\n119:  1000 lines by position; the newest rows survive (the value-filter would have\n120:  deleted them — write that as the negative control).\n121:- Existing `appends_assign_monotonic_seqs_from_one`, `seqs never rewind over a\n122:  trim` (:545) stay; `io_events_poll_e2e` blind-cursor arm: a `--after` above\n123:  the head still answers empty (that contract is right; the log was wrong).\n124:- Cross-OS: the byte-offset arithmetic is OS-neutral but run the mechanism unit\n125:  on kitsubito too — CRLF never enters this file (rows end `\\n`, :164) but say\n126:  so in the test comment.\n127:\n128:## 4. Base + branch + gate\n129:\n130:Base `origin/main` after v0.67.1 lands; branch `fix/277-iolog-seq-reset`,\n131:worktree `.worktrees/iolog-277`, own pool, claim from inside. Gate: treqs →\n132:workspace-bins prebuild → `xtask check` → clippy → `nextest -p spt-store -p spt`\n133:filtered `iolog|io_events|boundary_events` → kitsubito same legs → exit FILES\n134:read, pick-audit 1/1 at land. Field acceptance: after the node binary applies\n135:and the daemon restarts, `spt api io-events doyle --after 0 --json` shows\n136:distinct seqs == events, and one more turn appends `max + 1`.\n137:\n138:## 5. Out of scope\n139:\n140:- Adapter frame-leg session refusal (perri, 0.38.4).\n141:- The digest's own `seq` (different counter, different store, not measured).\n142:- `worker_seq` (named as kin in :253) — census it in the PR body (does it tail-\n143:  read UTF-8 the same way?) and file separately if so; do not fold it in."}],"details":{"totalLines":143,"displayContent":{"text":"# io-events seq reset past 256KB — lane JIT\n\nAuthored by doyle 2026-09-06 ~08:50Z. Finding: perri (adapter side, retraction of\nhis own refutation), mechanism measured by doyle on the raw log bytes. Product\nchange in `spt-store` → todlando, thin lane, lands AFTER v0.67.1 and after #276\n(same builder). Source cited at `04e32c8c` (= main `8a21a3b0` for every file\nhere). Releases issue: #277 (minted 2026-09-06 08:44Z).\n\nIssue: `BigscreenVR/spt-bs-releases#277`\n\n## 0. Measured\n\n- doyle funnel `--after 0`: 1183 events, 313 distinct seqs, max dup 10, 121\n  COMMUNE frames carrying `!!wake!!`. 9 resets to seq 1 (one is a 1→1 duplicate\n  a `<` test misses — use `<=`).\n- Raw log `%LOCALAPPDATA%\\spt-core\\owlery\\doyle\\io-events.log` (1.81MB, 1191\n  rows): for EVERY reset, the reconstructed `len_before - 256KB` window start\n  byte is a UTF-8 continuation byte (0x80-0xBF) and the window does not decode.\n  9/9 explained; 0 continuation-byte window starts that did NOT reset.\n- Box census (15 perches): resets only on the four logs >256KB (doyle 9,\n  todlando 5, perri 2, deployah 1); 0 on all 11 logs under 256KB.\n- Trim arithmetic: doyle rows=1191, `last-first+1` = 147 → retention floor\n  (1000+250) never reached by the counter; log grows unbounded.\n\n## 1. Mechanism (`crates/spt-store/src/iolog.rs`)\n\n`last_seq_at` (:199-232): `seek(len - TAIL_WINDOW)` then `read_to_string` into a\n`String`. A seek landing mid-codepoint makes `read_to_string` return\n`InvalidData`; the fn answers 0 (:215-217); `append_locked` (:270) mints\n`0 + 1 = 1`. The fragment line is discarded anyway (:227-230), so the decode\nfailure buys nothing — it is a pure false zero. `first_seq_at` (:236-247)\nalready reads bytes + `from_utf8_lossy`; the tail reader should have matched it.\n\nDownstream of a false zero:\n1. Every later append continues from the false block (2, 3, …) — seq is no\n   longer a cursor; api.md:482 (\"this log's own cursor\") is false.\n2. `read_after_at(after)` filters by VALUE (:338): a carried cursor above the\n   new block is BLIND (empty forever until the block climbs past it); a low\n   cursor REPLAYS every older block's rows above it — including COMMUNE frames\n   that carry live wake markers. That is the adapter-side refire.\n3. Seed path (`ioevents.rs:143`) seeds at the false head → the next poll replays\n   older blocks too.\n4. `trim_locked` (:291-309): `rows = last - first + 1` under-counts (never\n   trims) OR, when the current block outgrows the head seq, filters\n   `s >= keep_from` by value across ALL blocks and deletes the NEWEST block's\n   low-seq rows. Retention floor is not a floor.\n\n## 2. Shape (binding)\n\n**A. Fix the reader** — `last_seq_at`: read the tail window as BYTES\n(`read_to_end`), drop everything up to and including the first `\\n` when\n`start > 0` (the fragment rule already there), then decode with\n`String::from_utf8_lossy` (a row's JSON may legitimately be UTF-8; the seq\nprefix is ASCII, `line_seq` only needs the prefix). A decode failure is no\nlonger a possible arm — delete the `is_err → 0` return. Keep the\n\"window reached no line start → whole-file read\" arm (:220-225).\n\n**B. Make the monotonic invariant EXPLICIT** — `append_locked` mints\n`max(last_seq_at, <highest seq ever handed out>) + 1`. Cheapest true source of\n\"highest ever\": the tail read now returns the max over the tail WINDOW (not the\nlast line), and the existing logs on the box carry blocks whose max is above the\nlast line (doyle: last 147, global max 313). Decide between (i) max over the\ntail window only (bounded cost, still wrong if the older block lies outside the\nwindow) and (ii) one whole-file max scan ONLY when the last line's seq is below\nthe first line's seq (`first_seq_at` is already read per trim; a single\n`last < first` comparison detects a reset-damaged log cheaply and pays the\nfull scan once per append until repaired). Lean (ii) + repair (C).\n\n**C. Repair damaged logs once, in place** — on the first append that detects\n`last < first`, rewrite the file under the exclusive lock: keep every row in\nFILE order, renumber `global_max + 1 …` (so every existing row gets a seq above\nany cursor ever handed out on that perch). State the consequence in the PR +\ndocs: **a session carrying an old cursor will see the retained history ONCE**\nafter the repair. That is the honest replay: it is bounded (≤1250 rows), it\nhappens once, and it is what `--after` promised. Adapters that must not re-arm\non old COMMUNE frames need perri's 0.38.4 refusal (frame older than the current\nsession) — cite it in the PR body as the adapter half, not a core dependency.\nFork for the lane: if todlando measures the one-time replay as unacceptable\nfor a specific adapter surface, stop-and-refer with the measurement; do not\nsilently choose \"drop history\" — history loss is the digest's contract to\nbreak, not this log's.\n\n**D. Trim by POSITION, not by value** — `trim_locked` counts rows by lines (the\nfile is read whole for the rewrite anyway; count first, rewrite only when over\nthe bound) and keeps the last `IO_LOG_MAX_ROWS` LINES. With (A)+(B) the seq is\nmonotonic again so value-vs-position agree; position is the one that stays\nright if anything ever regresses (A).\n\n**E. Docs** — api.md:482 stays true after the fix; add ONE sentence in the\n`--after` bullet (:453-456): a cursor above the log's head answers empty, so an\nadapter that persists a cursor across core upgrades should treat a long silence\nwith a non-empty digest as a cursor to re-seed (`--session-id` seeds itself;\n`--token` callers own that). Cross-check `docs-site/src/shells/frames.md` and\n`reference/json-shapes.md` for any \"seq never repeats\" prose — read every hit.\n\n**F. Traceability** (`traceable-reqs.toml` FIRST, then `check`, exit 2 = did\nnot parse; no `\"` in titles):\n- Mint `REQ-HAZARD-IOLOG-SEQ-MONOTONIC` — *the io-events seq is strictly\n  increasing for the life of a perch's log; a tail read never answers a false\n  zero* — stages `impl`, `unit`. KNOWN-HAZARDS new entry (Failure: 256KB tail\n  seek mid-codepoint → `read_to_string` InvalidData → seq 1; 9/9 on doyle's log,\n  four perches on one box; Invariant: tail reads decode lossy after the\n  fragment drop, append mints above the global max; mapping: `iolog.rs\n  last_seq_at/append_locked/trim_locked`) + table row.\n- `REQ-IO-EVENT-ADAPTER-LOG` gains the repair + position-trim units.\n\n## 3. Tests (all in this lane)\n\n- **The mechanism unit** `[unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]`: build a log\n  whose byte length puts `len - TAIL_WINDOW` INSIDE a 3-byte char (pad payloads\n  with `\\u{4e16}`; compute the offset, assert the byte at it is 0x80-0xBF as the\n  test's own precondition), then `append_at` and assert the seq is `last + 1`,\n  not 1. **Mutation proof in the PR body**: restore `read_to_string` and this\n  test mints 1.\n- Repair unit: a hand-built log with two blocks (…203, 1, 2, 3) → one append →\n  file rows in original order, seqs `204..`, new row `204 + n`, no row lost\n  (byte-compare payloads).\n- Trim unit: a log of 1251 rows with a reset inside it → trim keeps the LAST\n  1000 lines by position; the newest rows survive (the value-filter would have\n  deleted them — write that as the negative control).\n- Existing `appends_assign_monotonic_seqs_from_one`, `seqs never rewind over a\n  trim` (:545) stay; `io_events_poll_e2e` blind-cursor arm: a `--after` above\n  the head still answers empty (that contract is right; the log was wrong).\n- Cross-OS: the byte-offset arithmetic is OS-neutral but run the mechanism unit\n  on kitsubito too — CRLF never enters this file (rows end `\\n`, :164) but say\n  so in the test comment.\n\n## 4. Base + branch + gate\n\nBase `origin/main` after v0.67.1 lands; branch `fix/277-iolog-seq-reset`,\nworktree `.worktrees/iolog-277`, own pool, claim from inside. Gate: treqs →\nworkspace-bins prebuild → `xtask check` → clippy → `nextest -p spt-store -p spt`\nfiltered `iolog|io_events|boundary_events` → kitsubito same legs → exit FILES\nread, pick-audit 1/1 at land. Field acceptance: after the node binary applies\nand the daemon restarts, `spt api io-events doyle --after 0 --json` shows\ndistinct seqs == events, and one more turn appends `max + 1`.\n\n## 5. Out of scope\n\n- Adapter frame-leg session refusal (perri, 0.38.4).\n- The digest's own `seq` (different counter, different store, not measured).\n- `worker_seq` (named as kin in :253) — census it in the PR body (does it tail-\n  read UTF-8 the same way?) and file separately if so; do not fold it in.","startLine":1,"lineNumbers":[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143]},"fileSize":8523,"meta":{"source":{"type":"path","value":"C:/Users/decid/Documents/projects/spt-core/IOLOG-SEQ-RESET-JIT.md"}}},"isError":false,"timestamp":1788696611000}}
{"type":"message","id":"792e1527","parentId":"e2d43e6a","timestamp":"2026-09-06T12:10:11.005Z","message":{"role":"toolResult","toolCallId":"call_SHZhVsY2tQplpqi8wcPX0Vog|fc_0a8f6f40d1e69e19016a9d5822d91c87d2be30f2d88292245e","toolName":"read","content":[{"type":"text","text":"[.worktrees/iolog-277/crates/spt-store/src/iolog.rs#F599]\n1://! The **adapter-consumable IO event log** — a per-endpoint, append-only,\n2://! cursorable record of the IO funnel's events (releases#234, CONDUIT W3).\n3://!\n4://! ## Why a new store at all\n5://! Operator ruling 2 fixed the shape of adapter consumption: a NEW READER, not a\n6://! funnel rework. On the sink side that holds exactly as claimed — the consumer\n7://! is one `bus.register` line. **The reader is free; the store is not.** Neither\n8://! sink that shipped before this one writes a surface a cursor can walk:\n9://! `ShellLinkSink` spools per linked shell (keyed by a link token, drained by\n10://! whoever reads it) and `LastMsgSink` keeps two overwritten slots. A\n11://! delta-cursored poll needs an ordered, per-endpoint, non-destructive log, and\n12://! this module is it. Saying so is the honest half of the funnel's own claim.\n13://!\n14://! ## The line format, and why the seq is not a JSON field\n15://! A row is `<seq>` TAB `<json>` and nothing else. The cursor scan therefore\n16://! parses an integer prefix and never the body — a poll skipping a thousand\n17://! already-seen rows does a thousand tab splits rather than a thousand JSON\n18://! parses. It also means the ordering key cannot become an accident of\n19://! serialization field order: [`IoLogRow::seq`] is `serde(skip)` precisely so\n20://! the number has ONE spelling on disk.\n21://!\n22://! ## Two different numbers both called seq\n23://! [`IoLogRow::seq`] is this log's own cursor. [`IoLogRow::digest_seq`] is the\n24://! digest entry holding the untruncated content. They are unrelated counters and\n25://! are spelled differently on purpose: one name for two cursors is a consumer\n26://! following the wrong one, and the digest stays the content surface a truncated\n27://! payload points at.\n28://!\n29://! ## Retention, from a measured rate\n30://! [`IO_LOG_MAX_ROWS`] is a CHOICE with a measurement behind it, not a round\n31://! number. See its docs.\n32:\n33:use std::io::{self, Read, Seek, SeekFrom, Write};\n…\n37:use serde::{Deserialize, Serialize};\n38:\n39:/// `<resolved_perch>/io-events.log` — the single path source for the log.\n40:pub const IO_LOG_FILE: &str = \"io-events.log\";\n41:\n42:/// The STABLE lock sentinel serializing appends and shielding readers from a\n43:/// trim's rewrite. Created once and never renamed, on the inode-stability\n44:/// discipline [`crate::info`] locks info.json writers on.\n45:pub const IO_LOG_LOCK_FILE: &str = \".io-events.lock\";\n46:\n47:/// How many rows one endpoint's log retains before the oldest are dropped.\n48:///\n49:/// **Measured, not guessed** (releases#234 proposal item 5, measured 2026-08-28\n50:/// over 1117 harness transcripts of this project): the busiest single hour ever\n51:/// observed on a live endpoint carried 43 turn boundaries, and a typical busy\n52:/// hour carried 13-16. Each turn boundary is TWO events (`USER_INPUT` at the\n53:/// busy edge, `AGENT_OUTPUT` at the idle edge), and message traffic cannot\n54:/// exceed the turn rate on a harness where an inbound message IS a turn — so a\n55:/// peak hour is bounded above by ~130 events and a typical busy hour by ~45.\n56:///\n57:/// **RE-DERIVED for mid-turn emission (releases#238, gated 2026-08-29), and the\n58:/// figure survived its own re-derivation.** The premise below is no longer the\n59:/// only emission shape: an adapter may report MID-TURN SPANS, so a turn costs\n60:/// two events plus however many spans it reports. At the finest plausible\n61:/// quantum — one span per digest entry — the same corpus puts the peak near\n62:/// ~540/hr, which is the number the paragraph below already carried and handed\n63:/// to this lane. So the horizons are now **~1.85 h of the worst hour ever\n64:/// measured** (1000/540) and **~5.3 h of ordinary busy work** (~187/hr), where\n65:/// they were ~7.7 h and ~22 h under turn-boundary-only emission.\n66:///\n67:/// **1000 rows still stands, on the new basis:** ~540/hr is an upper bound\n68:/// rather than an expected rate (the adapter picks its cadence, and a coarser\n69:/// one lands between 130 and 540); the byte ceiling stays as derived below,\n70:/// which a larger row cap would multiply; and ~1.85 h still exceeds any live\n71:/// adapter poll loop by orders of magnitude. The failure mode of a short log is\n72:/// a GAP, which is the same failure an adapter must already tolerate for a dead\n73:/// cursor: a new session seeds silently rather than replaying.\n74:///\n75:/// **It is also the byte bound, derived rather than declared as a second knob.**\n76:/// Payloads are stored already bounded to [`spt_proto::ioevent::IO_PAYLOAD_CAP`]\n77:/// (16KB), so the real ceiling — this plus [`IO_LOG_TRIM_SLACK`], since the log\n78:/// is allowed to run into the slack before it rewrites — is 1250 rows, i.e. 20MB\n79:/// pathological and single-digit MB in the measured case. A second byte-cap knob\n80:/// would be a second place to be wrong.\n81:///\n82:/// **So this is a FLOOR on retention, not a ceiling on it**: the log holds\n83:/// between this many rows and this many plus the slack. Anything reasoning about\n84:/// what is still readable should reason about the floor.\n85:///\n86:/// **The premise this is sized on, stated so the number carries its basis:**\n87:/// TURN-BOUNDARY emission — two events per boundary, ~130/hr at the measured\n88:/// peak. That premise is a fact about what the funnel EMITS, not about this\n89:/// module, so a wave that adds an emitter re-derives this figure rather than\n90:/// inheriting it. A mid-turn emitter at the digest-entry quantum would put the\n91:/// peak near ~540/hr on the same corpus (measured 2026-08-28, same 1117\n92:/// transcripts), which is a different bound and belongs to whichever request\n93:/// lands that emitter — it is deliberately NOT folded in here, because a\n94:/// retention figure sized on emission that does not exist yet is a guess wearing\n95:/// a measurement's clothes. **That request was releases#238 and it has landed;\n96:/// the re-derivation is the block above, and this paragraph is kept as the\n97:/// record of what the figure was originally sized on.**\n98:pub const IO_LOG_MAX_ROWS: u64 = 1000;\n99:\n100:/// How far past [`IO_LOG_MAX_ROWS`] the log may run before a trim rewrites it.\n101:///\n102:/// **The slack is what keeps an append from being a rewrite.** Trimming at\n103:/// exactly the cap would rewrite the whole file on every append past it; with a\n104:/// 25% slack a trim happens once per 250 appends and the amortized cost of an\n105:/// append stays a single write.\n106:pub const IO_LOG_TRIM_SLACK: u64 = 250;\n107:\n108:/// One recorded event.\n109:///\n110:/// Serialized as the JSON half of a `<seq>` TAB `<json>` line; see the module\n111:/// docs for why [`Self::seq`] is not in that JSON.\n112:#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]\n113-142:pub struct IoLogRow { … }\n143:\n144:/// The log file for an already-resolved perch.\n145:// [impl->REQ-HAZARD-SINGLE-PATH-SOURCE]\n146:pub fn io_log_file_at(perch_path: &Path) -> PathBuf {\n147:    perch_path.join(IO_LOG_FILE)\n148:}\n149:\n150:/// The lock sentinel for an already-resolved perch.\n151:// [impl->REQ-HAZARD-SINGLE-PATH-SOURCE]\n152:fn io_log_lock_at(perch_path: &Path) -> PathBuf {\n153:    perch_path.join(IO_LOG_LOCK_FILE)\n154:}\n155:\n156:/// Compose one line. ONE spelling of the format, used by writer and tests alike.\n157:// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n158-165:fn compose_line(row: &IoLogRow) -> Result<String, String> { … }\n166:\n167:/// Parse one line back. Answers `None` for anything malformed — a log with one\n168:/// corrupt line must still be readable, because the alternative is a poll that\n169:/// refuses forever over a byte nobody can find.\n170:// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n171-177:fn parse_line(line: &str) -> Option<IoLogRow> { … }\n178:\n179:/// Just the seq of a line, without touching the body — the cursor scan's whole\n180:/// hot path.\n181:fn line_seq(line: &str) -> Option<u64> {\n182:    line.split_once('\\t')?.0.trim().parse().ok()\n183:}\n184:\n185:/// How far back from EOF to look for the last line's start.\n186:///\n187:/// A stored payload is capped at 16KB, but JSON escaping can inflate one byte to\n188:/// six, so a single row can legitimately approach 100KB. 256KB is comfortably\n189:/// past that, and a window that still falls short falls back to a full scan\n190:/// rather than answering wrong.\n191:const TAIL_WINDOW: u64 = 256 * 1024;\n192:\n193:/// The highest seq the log holds, or 0 when it holds nothing.\n194:///\n195:/// **Read from the tail, not by counting**: this runs on every append, and a\n196:/// whole-file read per append would make the log's cost quadratic in its own\n197:/// length.\n198:// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n199-232:pub fn last_seq_at(perch_path: &Path) -> u64 { … }\n233:\n234:/// The lowest seq the log holds, or 0 when it holds nothing. Read from the head,\n235:/// for the same reason [`last_seq_at`] reads from the tail.\n236-247:fn first_seq_at(perch_path: &Path) -> u64 { … }\n248:\n249:/// Append one event, assigning it the next seq. Answers the seq assigned.\n250:///\n251:/// **Serialized under an exclusive advisory lock.** The daemon publishes from\n252:/// several edges (a state call, a send, a delivery, an ingest) and two racing\n253:/// appends must not mint a colliding seq — the same hazard [`crate::worker_seq`]\n254:/// locks its counter against, for the same reason.\n255:// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n256-267:pub fn append_at(perch_path: &Path, row: &IoLogRow) -> io::Result<u64> { … }\n268:\n269-284:fn append_locked(perch_path: &Path, row: &IoLogRow) -> io::Result<u64> { … }\n285:\n286:/// Drop the oldest rows when the log has run past its bound plus slack.\n287:///\n288:/// Seqs are contiguous — assigned +1 per append and trimmed only from the front\n289:/// — so the row count is `last - first + 1` and needs no scan to compute.\n290:// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n291-309:fn trim_locked(perch_path: &Path, last: u64) -> io::Result<()> { … }\n310:\n311:/// Every row with `seq` strictly greater than `after`, oldest first.\n312:///\n313:/// `limit` caps how many are returned, keeping the OLDEST of the new ones so a\n314:/// capped poll advances the cursor without skipping a row.\n315:///\n316:/// **Takes the SHARED lock**: a trim rewrites the file, and a reader that raced\n317:/// it would see a half-written log. Readers do not exclude each other.\n318:// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n319-349:pub fn read_after_at(perch_path: &Path, after: u64, limit: Option<usize>) -> Vec<IoLogRow> { … }\n350:\n351:#[cfg(test)]\n352-579:mod tests { … }\n\n[…380ln elided; re-read needed ranges, e.g. .worktrees/iolog-277/crates/spt-store/src/iolog.rs:34-36,113-142]"}],"details":{"displayContent":{"text":"//! The **adapter-consumable IO event log** — a per-endpoint, append-only,\n//! cursorable record of the IO funnel's events (releases#234, CONDUIT W3).\n//!\n//! ## Why a new store at all\n//! Operator ruling 2 fixed the shape of adapter consumption: a NEW READER, not a\n//! funnel rework. On the sink side that holds exactly as claimed — the consumer\n//! is one `bus.register` line. **The reader is free; the store is not.** Neither\n//! sink that shipped before this one writes a surface a cursor can walk:\n//! `ShellLinkSink` spools per linked shell (keyed by a link token, drained by\n//! whoever reads it) and `LastMsgSink` keeps two overwritten slots. A\n//! delta-cursored poll needs an ordered, per-endpoint, non-destructive log, and\n//! this module is it. Saying so is the honest half of the funnel's own claim.\n//!\n//! ## The line format, and why the seq is not a JSON field\n//! A row is `<seq>` TAB `<json>` and nothing else. The cursor scan therefore\n//! parses an integer prefix and never the body — a poll skipping a thousand\n//! already-seen rows does a thousand tab splits rather than a thousand JSON\n//! parses. It also means the ordering key cannot become an accident of\n//! serialization field order: [`IoLogRow::seq`] is `serde(skip)` precisely so\n//! the number has ONE spelling on disk.\n//!\n//! ## Two different numbers both called seq\n//! [`IoLogRow::seq`] is this log's own cursor. [`IoLogRow::digest_seq`] is the\n//! digest entry holding the untruncated content. They are unrelated counters and\n//! are spelled differently on purpose: one name for two cursors is a consumer\n//! following the wrong one, and the digest stays the content surface a truncated\n//! payload points at.\n//!\n//! ## Retention, from a measured rate\n//! [`IO_LOG_MAX_ROWS`] is a CHOICE with a measurement behind it, not a round\n//! number. See its docs.\n\nuse std::io::{self, Read, Seek, SeekFrom, Write};\n…\nuse serde::{Deserialize, Serialize};\n\n/// `<resolved_perch>/io-events.log` — the single path source for the log.\npub const IO_LOG_FILE: &str = \"io-events.log\";\n\n/// The STABLE lock sentinel serializing appends and shielding readers from a\n/// trim's rewrite. Created once and never renamed, on the inode-stability\n/// discipline [`crate::info`] locks info.json writers on.\npub const IO_LOG_LOCK_FILE: &str = \".io-events.lock\";\n\n/// How many rows one endpoint's log retains before the oldest are dropped.\n///\n/// **Measured, not guessed** (releases#234 proposal item 5, measured 2026-08-28\n/// over 1117 harness transcripts of this project): the busiest single hour ever\n/// observed on a live endpoint carried 43 turn boundaries, and a typical busy\n/// hour carried 13-16. Each turn boundary is TWO events (`USER_INPUT` at the\n/// busy edge, `AGENT_OUTPUT` at the idle edge), and message traffic cannot\n/// exceed the turn rate on a harness where an inbound message IS a turn — so a\n/// peak hour is bounded above by ~130 events and a typical busy hour by ~45.\n///\n/// **RE-DERIVED for mid-turn emission (releases#238, gated 2026-08-29), and the\n/// figure survived its own re-derivation.** The premise below is no longer the\n/// only emission shape: an adapter may report MID-TURN SPANS, so a turn costs\n/// two events plus however many spans it reports. At the finest plausible\n/// quantum — one span per digest entry — the same corpus puts the peak near\n/// ~540/hr, which is the number the paragraph below already carried and handed\n/// to this lane. So the horizons are now **~1.85 h of the worst hour ever\n/// measured** (1000/540) and **~5.3 h of ordinary busy work** (~187/hr), where\n/// they were ~7.7 h and ~22 h under turn-boundary-only emission.\n///\n/// **1000 rows still stands, on the new basis:** ~540/hr is an upper bound\n/// rather than an expected rate (the adapter picks its cadence, and a coarser\n/// one lands between 130 and 540); the byte ceiling stays as derived below,\n/// which a larger row cap would multiply; and ~1.85 h still exceeds any live\n/// adapter poll loop by orders of magnitude. The failure mode of a short log is\n/// a GAP, which is the same failure an adapter must already tolerate for a dead\n/// cursor: a new session seeds silently rather than replaying.\n///\n/// **It is also the byte bound, derived rather than declared as a second knob.**\n/// Payloads are stored already bounded to [`spt_proto::ioevent::IO_PAYLOAD_CAP`]\n/// (16KB), so the real ceiling — this plus [`IO_LOG_TRIM_SLACK`], since the log\n/// is allowed to run into the slack before it rewrites — is 1250 rows, i.e. 20MB\n/// pathological and single-digit MB in the measured case. A second byte-cap knob\n/// would be a second place to be wrong.\n///\n/// **So this is a FLOOR on retention, not a ceiling on it**: the log holds\n/// between this many rows and this many plus the slack. Anything reasoning about\n/// what is still readable should reason about the floor.\n///\n/// **The premise this is sized on, stated so the number carries its basis:**\n/// TURN-BOUNDARY emission — two events per boundary, ~130/hr at the measured\n/// peak. That premise is a fact about what the funnel EMITS, not about this\n/// module, so a wave that adds an emitter re-derives this figure rather than\n/// inheriting it. A mid-turn emitter at the digest-entry quantum would put the\n/// peak near ~540/hr on the same corpus (measured 2026-08-28, same 1117\n/// transcripts), which is a different bound and belongs to whichever request\n/// lands that emitter — it is deliberately NOT folded in here, because a\n/// retention figure sized on emission that does not exist yet is a guess wearing\n/// a measurement's clothes. **That request was releases#238 and it has landed;\n/// the re-derivation is the block above, and this paragraph is kept as the\n/// record of what the figure was originally sized on.**\npub const IO_LOG_MAX_ROWS: u64 = 1000;\n\n/// How far past [`IO_LOG_MAX_ROWS`] the log may run before a trim rewrites it.\n///\n/// **The slack is what keeps an append from being a rewrite.** Trimming at\n/// exactly the cap would rewrite the whole file on every append past it; with a\n/// 25% slack a trim happens once per 250 appends and the amortized cost of an\n/// append stays a single write.\npub const IO_LOG_TRIM_SLACK: u64 = 250;\n\n/// One recorded event.\n///\n/// Serialized as the JSON half of a `<seq>` TAB `<json>` line; see the module\n/// docs for why [`Self::seq`] is not in that JSON.\n#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]\npub struct IoLogRow { … }\n\n/// The log file for an already-resolved perch.\n// [impl->REQ-HAZARD-SINGLE-PATH-SOURCE]\npub fn io_log_file_at(perch_path: &Path) -> PathBuf {\n    perch_path.join(IO_LOG_FILE)\n}\n\n/// The lock sentinel for an already-resolved perch.\n// [impl->REQ-HAZARD-SINGLE-PATH-SOURCE]\nfn io_log_lock_at(perch_path: &Path) -> PathBuf {\n    perch_path.join(IO_LOG_LOCK_FILE)\n}\n\n/// Compose one line. ONE spelling of the format, used by writer and tests alike.\n// [impl->REQ-IO-EVENT-ADAPTER-LOG]\nfn compose_line(row: &IoLogRow) -> Result<String, String> { … }\n\n/// Parse one line back. Answers `None` for anything malformed — a log with one\n/// corrupt line must still be readable, because the alternative is a poll that\n/// refuses forever over a byte nobody can find.\n// [impl->REQ-IO-EVENT-ADAPTER-LOG]\nfn parse_line(line: &str) -> Option<IoLogRow> { … }\n\n/// Just the seq of a line, without touching the body — the cursor scan's whole\n/// hot path.\nfn line_seq(line: &str) -> Option<u64> {\n    line.split_once('\\t')?.0.trim().parse().ok()\n}\n\n/// How far back from EOF to look for the last line's start.\n///\n/// A stored payload is capped at 16KB, but JSON escaping can inflate one byte to\n/// six, so a single row can legitimately approach 100KB. 256KB is comfortably\n/// past that, and a window that still falls short falls back to a full scan\n/// rather than answering wrong.\nconst TAIL_WINDOW: u64 = 256 * 1024;\n\n/// The highest seq the log holds, or 0 when it holds nothing.\n///\n/// **Read from the tail, not by counting**: this runs on every append, and a\n/// whole-file read per append would make the log's cost quadratic in its own\n/// length.\n// [impl->REQ-IO-EVENT-ADAPTER-LOG]\npub fn last_seq_at(perch_path: &Path) -> u64 { … }\n\n/// The lowest seq the log holds, or 0 when it holds nothing. Read from the head,\n/// for the same reason [`last_seq_at`] reads from the tail.\nfn first_seq_at(perch_path: &Path) -> u64 { … }\n\n/// Append one event, assigning it the next seq. Answers the seq assigned.\n///\n/// **Serialized under an exclusive advisory lock.** The daemon publishes from\n/// several edges (a state call, a send, a delivery, an ingest) and two racing\n/// appends must not mint a colliding seq — the same hazard [`crate::worker_seq`]\n/// locks its counter against, for the same reason.\n// [impl->REQ-IO-EVENT-ADAPTER-LOG]\npub fn append_at(perch_path: &Path, row: &IoLogRow) -> io::Result<u64> { … }\n\nfn append_locked(perch_path: &Path, row: &IoLogRow) -> io::Result<u64> { … }\n\n/// Drop the oldest rows when the log has run past its bound plus slack.\n///\n/// Seqs are contiguous — assigned +1 per append and trimmed only from the front\n/// — so the row count is `last - first + 1` and needs no scan to compute.\n// [impl->REQ-IO-EVENT-ADAPTER-LOG]\nfn trim_locked(perch_path: &Path, last: u64) -> io::Result<()> { … }\n\n/// Every row with `seq` strictly greater than `after`, oldest first.\n///\n/// `limit` caps how many are returned, keeping the OLDEST of the new ones so a\n/// capped poll advances the cursor without skipping a row.\n///\n/// **Takes the SHARED lock**: a trim rewrites the file, and a reader that raced\n/// it would see a half-written log. Readers do not exclude each other.\n// [impl->REQ-IO-EVENT-ADAPTER-LOG]\npub fn read_after_at(perch_path: &Path, after: u64, limit: Option<usize>) -> Vec<IoLogRow> { … }\n\n#[cfg(test)]\nmod tests { … }","startLine":1},"summary":{"lines":190,"elidedSpans":11,"elidedLines":380},"fileSize":26522,"meta":{"source":{"type":"path","value":"C:/Users/decid/Documents/projects/spt-core/.worktrees/iolog-277/crates/spt-store/src/iolog.rs"}}},"isError":false,"timestamp":1788696611005}}
{"type":"message","id":"8da92e8b","parentId":"792e1527","timestamp":"2026-09-06T12:10:11.006Z","message":{"role":"toolResult","toolCallId":"call_OB7RZwKsqYolXpE81ISE3lw4|fc_0a8f6f40d1e69e19016a9d5822d91487d2aca9c6e09e408891","toolName":"read","content":[{"type":"text","text":"---\nname: diagnose\ndescription: Disciplined diagnosis loop for hard bugs and performance regressions. Reproduce → minimise → hypothesise → instrument → fix → regression-test. Use when user says \"diagnose this\" / \"debug this\", reports a bug, says something is broken/throwing/failing, or describes a performance regression.\n---\n\n# Diagnose\n\nA discipline for hard bugs. Skip phases only when explicitly justified.\n\nWhen exploring the codebase, use the project's domain glossary to get a clear mental model of the relevant modules, and check ADRs in the area you're touching.\n\n## Phase 1 — Build a feedback loop\n\n**This is the skill.** Everything else is mechanical. If you have a fast, deterministic, agent-runnable pass/fail signal for the bug, you will find the cause — bisection, hypothesis-testing, and instrumentation all just consume that signal. If you don't have one, no amount of staring at code will save you.\n\nSpend disproportionate effort here. **Be aggressive. Be creative. Refuse to give up.**\n\n### Ways to construct one — try them in roughly this order\n\n1. **Failing test** at whatever seam reaches the bug — unit, integration, e2e.\n2. **Curl / HTTP script** against a running dev server.\n3. **CLI invocation** with a fixture input, diffing stdout against a known-good snapshot.\n4. **Headless browser script** (Playwright / Puppeteer) — drives the UI, asserts on DOM/console/network.\n5. **Replay a captured trace.** Save a real network request / payload / event log to disk; replay it through the code path in isolation.\n6. **Throwaway harness.** Spin up a minimal subset of the system (one service, mocked deps) that exercises the bug code path with a single function call.\n7. **Property / fuzz loop.** If the bug is \"sometimes wrong output\", run 1000 random inputs and look for the failure mode.\n8. **Bisection harness.** If the bug appeared between two known states (commit, dataset, version), automate \"boot at state X, check, repeat\" so you can `git bisect run` it.\n9. **Differential loop.** Run the same input through old-version vs new-version (or two configs) and diff outputs.\n10. **HITL bash script.** Last resort. If a human must click, drive _them_ with `scripts/hitl-loop.template.sh` so the loop is still structured. Captured output feeds back to you.\n\nBuild the right feedback loop, and the bug is 90% fixed.\n\n### Iterate on the loop itself\n\nTreat the loop as a product. Once you have _a_ loop, ask:\n\n- Can I make it faster? (Cache setup, skip unrelated init, narrow the test scope.)\n- Can I make the signal sharper? (Assert on the specific symptom, not \"didn't crash\".)\n- Can I make it more deterministic? (Pin time, seed RNG, isolate filesystem, freeze network.)\n\nA 30-second flaky loop is barely better than no loop. A 2-second deterministic loop is a debugging superpower.\n\n### Non-deterministic bugs\n\nThe goal is not a clean repro but a **higher reproduction rate**. Loop the trigger 100×, parallelise, add stress, narrow timing windows, inject sleeps. A 50%-flake bug is debuggable; 1% is not — keep raising the rate until it's debuggable.\n\n### When you genuinely cannot build a loop\n\nStop and say so explicitly. List what you tried. Ask the user for: (a) access to whatever environment reproduces it, (b) a captured artifact (HAR file, log dump, core dump, screen recording with timestamps), or (c) permission to add temporary production instrumentation. Do **not** proceed to hypothesise without a loop.\n\nDo not proceed to Phase 2 until you have a loop you believe in.\n\n## Phase 2 — Reproduce\n\nRun the loop. Watch the bug appear.\n\nConfirm:\n\n- [ ] The loop produces the failure mode the **user** described — not a different failure that happens to be nearby. Wrong bug = wrong fix.\n- [ ] The failure is reproducible across multiple runs (or, for non-deterministic bugs, reproducible at a high enough rate to debug against).\n- [ ] You have captured the exact symptom (error message, wrong output, slow timing) so later phases can verify the fix actually addresses it.\n\nDo not proceed until you reproduce the bug.\n\n## Phase 3 — Hypothesise\n\nGenerate **3–5 ranked hypotheses** before testing any of them. Single-hypothesis generation anchors on the first plausible idea.\n\nEach hypothesis must be **falsifiable**: state the prediction it makes.\n\n> Format: \"If <X> is the cause, then <changing Y> will make the bug disappear / <changing Z> will make it worse.\"\n\nIf you cannot state the prediction, the hypothesis is a vibe — discard or sharpen it.\n\n**Show the ranked list to the user before testing.** They often have domain knowledge that re-ranks instantly (\"we just deployed a change to #3\"), or know hypotheses they've already ruled out. Cheap checkpoint, big time saver. Don't block on it — proceed with your ranking if the user is AFK.\n\n## Phase 4 — Instrument\n\nEach probe must map to a specific prediction from Phase 3. **Change one variable at a time.**\n\nTool preference:\n\n1. **Debugger / REPL inspection** if the env supports it. One breakpoint beats ten logs.\n2. **Targeted logs** at the boundaries that distinguish hypotheses.\n3. Never \"log everything and grep\".\n\n**Tag every debug log** with a unique prefix, e.g. `[DEBUG-a4f2]`. Cleanup at the end becomes a single grep. Untagged logs survive; tagged logs die.\n\n**Perf branch.** For performance regressions, logs are usually wrong. Instead: establish a baseline measurement (timing harness, `performance.now()`, profiler, query plan), then bisect. Measure first, fix second.\n\n## Phase 5 — Fix + regression test\n\nWrite the regression test **before the fix** — but only if there is a **correct seam** for it.\n\nA correct seam is one where the test exercises the **real bug pattern** as it occurs at the call site. If the only available seam is too shallow (single-caller test when the bug needs multiple callers, unit test that can't replicate the chain that triggered the bug), a regression test there gives false confidence.\n\n**If no correct seam exists, that itself is the finding.** Note it. The codebase architecture is preventing the bug from being locked down. Flag this for the next phase.\n\nIf a correct seam exists:\n\n1. Turn the minimised repro into a failing test at that seam.\n2. Watch it fail.\n3. Apply the fix.\n4. Watch it pass.\n5. Re-run the Phase 1 feedback loop against the original (un-minimised) scenario.\n\n## Phase 6 — Cleanup + post-mortem\n\nRequired before declaring done:\n\n- [ ] Original repro no longer reproduces (re-run the Phase 1 loop)\n- [ ] Regression test passes (or absence of seam is documented)\n- [ ] All `[DEBUG-...]` instrumentation removed (`grep` the prefix)\n- [ ] Throwaway prototypes deleted (or moved to a clearly-marked debug location)\n- [ ] The hypothesis that turned out correct is stated in the commit / PR message — so the next debugger learns\n\n**Then ask: what would have prevented this bug?** If the answer involves architectural change (no good test seam, tangled callers, hidden coupling) hand off to the `/improve-codebase-architecture` skill with the specifics. Make the recommendation **after** the fix is in, not before — you have more information now than when you started."}],"details":{"resolvedPath":"C:\\Users\\decid\\.agents\\skills\\diagnose\\SKILL.md","contentType":"text/markdown","totalLines":117,"displayContent":{"text":"---\r\nname: diagnose\r\ndescription: Disciplined diagnosis loop for hard bugs and performance regressions. Reproduce → minimise → hypothesise → instrument → fix → regression-test. Use when user says \"diagnose this\" / \"debug this\", reports a bug, says something is broken/throwing/failing, or describes a performance regression.\r\n---\r\n\r\n# Diagnose\r\n\r\nA discipline for hard bugs. Skip phases only when explicitly justified.\r\n\r\nWhen exploring the codebase, use the project's domain glossary to get a clear mental model of the relevant modules, and check ADRs in the area you're touching.\r\n\r\n## Phase 1 — Build a feedback loop\r\n\r\n**This is the skill.** Everything else is mechanical. If you have a fast, deterministic, agent-runnable pass/fail signal for the bug, you will find the cause — bisection, hypothesis-testing, and instrumentation all just consume that signal. If you don't have one, no amount of staring at code will save you.\r\n\r\nSpend disproportionate effort here. **Be aggressive. Be creative. Refuse to give up.**\r\n\r\n### Ways to construct one — try them in roughly this order\r\n\r\n1. **Failing test** at whatever seam reaches the bug — unit, integration, e2e.\r\n2. **Curl / HTTP script** against a running dev server.\r\n3. **CLI invocation** with a fixture input, diffing stdout against a known-good snapshot.\r\n4. **Headless browser script** (Playwright / Puppeteer) — drives the UI, asserts on DOM/console/network.\r\n5. **Replay a captured trace.** Save a real network request / payload / event log to disk; replay it through the code path in isolation.\r\n6. **Throwaway harness.** Spin up a minimal subset of the system (one service, mocked deps) that exercises the bug code path with a single function call.\r\n7. **Property / fuzz loop.** If the bug is \"sometimes wrong output\", run 1000 random inputs and look for the failure mode.\r\n8. **Bisection harness.** If the bug appeared between two known states (commit, dataset, version), automate \"boot at state X, check, repeat\" so you can `git bisect run` it.\r\n9. **Differential loop.** Run the same input through old-version vs new-version (or two configs) and diff outputs.\r\n10. **HITL bash script.** Last resort. If a human must click, drive _them_ with `scripts/hitl-loop.template.sh` so the loop is still structured. Captured output feeds back to you.\r\n\r\nBuild the right feedback loop, and the bug is 90% fixed.\r\n\r\n### Iterate on the loop itself\r\n\r\nTreat the loop as a product. Once you have _a_ loop, ask:\r\n\r\n- Can I make it faster? (Cache setup, skip unrelated init, narrow the test scope.)\r\n- Can I make the signal sharper? (Assert on the specific symptom, not \"didn't crash\".)\r\n- Can I make it more deterministic? (Pin time, seed RNG, isolate filesystem, freeze network.)\r\n\r\nA 30-second flaky loop is barely better than no loop. A 2-second deterministic loop is a debugging superpower.\r\n\r\n### Non-deterministic bugs\r\n\r\nThe goal is not a clean repro but a **higher reproduction rate**. Loop the trigger 100×, parallelise, add stress, narrow timing windows, inject sleeps. A 50%-flake bug is debuggable; 1% is not — keep raising the rate until it's debuggable.\r\n\r\n### When you genuinely cannot build a loop\r\n\r\nStop and say so explicitly. List what you tried. Ask the user for: (a) access to whatever environment reproduces it, (b) a captured artifact (HAR file, log dump, core dump, screen recording with timestamps), or (c) permission to add temporary production instrumentation. Do **not** proceed to hypothesise without a loop.\r\n\r\nDo not proceed to Phase 2 until you have a loop you believe in.\r\n\r\n## Phase 2 — Reproduce\r\n\r\nRun the loop. Watch the bug appear.\r\n\r\nConfirm:\r\n\r\n- [ ] The loop produces the failure mode the **user** described — not a different failure that happens to be nearby. Wrong bug = wrong fix.\r\n- [ ] The failure is reproducible across multiple runs (or, for non-deterministic bugs, reproducible at a high enough rate to debug against).\r\n- [ ] You have captured the exact symptom (error message, wrong output, slow timing) so later phases can verify the fix actually addresses it.\r\n\r\nDo not proceed until you reproduce the bug.\r\n\r\n## Phase 3 — Hypothesise\r\n\r\nGenerate **3–5 ranked hypotheses** before testing any of them. Single-hypothesis generation anchors on the first plausible idea.\r\n\r\nEach hypothesis must be **falsifiable**: state the prediction it makes.\r\n\r\n> Format: \"If <X> is the cause, then <changing Y> will make the bug disappear / <changing Z> will make it worse.\"\r\n\r\nIf you cannot state the prediction, the hypothesis is a vibe — discard or sharpen it.\r\n\r\n**Show the ranked list to the user before testing.** They often have domain knowledge that re-ranks instantly (\"we just deployed a change to #3\"), or know hypotheses they've already ruled out. Cheap checkpoint, big time saver. Don't block on it — proceed with your ranking if the user is AFK.\r\n\r\n## Phase 4 — Instrument\r\n\r\nEach probe must map to a specific prediction from Phase 3. **Change one variable at a time.**\r\n\r\nTool preference:\r\n\r\n1. **Debugger / REPL inspection** if the env supports it. One breakpoint beats ten logs.\r\n2. **Targeted logs** at the boundaries that distinguish hypotheses.\r\n3. Never \"log everything and grep\".\r\n\r\n**Tag every debug log** with a unique prefix, e.g. `[DEBUG-a4f2]`. Cleanup at the end becomes a single grep. Untagged logs survive; tagged logs die.\r\n\r\n**Perf branch.** For performance regressions, logs are usually wrong. Instead: establish a baseline measurement (timing harness, `performance.now()`, profiler, query plan), then bisect. Measure first, fix second.\r\n\r\n## Phase 5 — Fix + regression test\r\n\r\nWrite the regression test **before the fix** — but only if there is a **correct seam** for it.\r\n\r\nA correct seam is one where the test exercises the **real bug pattern** as it occurs at the call site. If the only available seam is too shallow (single-caller test when the bug needs multiple callers, unit test that can't replicate the chain that triggered the bug), a regression test there gives false confidence.\r\n\r\n**If no correct seam exists, that itself is the finding.** Note it. The codebase architecture is preventing the bug from being locked down. Flag this for the next phase.\r\n\r\nIf a correct seam exists:\r\n\r\n1. Turn the minimised repro into a failing test at that seam.\r\n2. Watch it fail.\r\n3. Apply the fix.\r\n4. Watch it pass.\r\n5. Re-run the Phase 1 feedback loop against the original (un-minimised) scenario.\r\n\r\n## Phase 6 — Cleanup + post-mortem\r\n\r\nRequired before declaring done:\r\n\r\n- [ ] Original repro no longer reproduces (re-run the Phase 1 loop)\r\n- [ ] Regression test passes (or absence of seam is documented)\r\n- [ ] All `[DEBUG-...]` instrumentation removed (`grep` the prefix)\r\n- [ ] Throwaway prototypes deleted (or moved to a clearly-marked debug location)\r\n- [ ] The hypothesis that turned out correct is stated in the commit / PR message — so the next debugger learns\r\n\r\n**Then ask: what would have prevented this bug?** If the answer involves architectural change (no good test seam, tangled callers, hidden coupling) hand off to the `/improve-codebase-architecture` skill with the specifics. Make the recommendation **after** the fix is in, not before — you have more information now than when you started.\r","startLine":1,"lineNumbers":[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117]},"meta":{"source":{"type":"internal","value":"skill://diagnose"}}},"isError":false,"timestamp":1788696611006}}
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Unrelated to [`Self::seq`].\n129:    #[serde(default, skip_serializing_if = \"Option::is_none\")]\n130:    pub digest_seq: Option<u64>,\n131:    /// The other endpoint, for the kinds that have one.\n132:    #[serde(default, skip_serializing_if = \"Option::is_none\")]\n133:    pub peer: Option<String>,\n134:    /// This `AGENT_OUTPUT` row is a MID-TURN SPAN, not the turn's closing\n135:    /// report (releases#238). Skipped when false, so every row written before\n136:    /// this field existed reads back identically and an older reader — which\n137:    /// drops the key entirely, see the module docs — degrades to counting a\n138:    /// span as a close rather than to a parse failure.\n139:    // [impl->REQ-IO-MIDTURN-SPAN]\n140:    #[serde(default, skip_serializing_if = \"std::ops::Not::not\")]\n141:    pub mid: bool,\n142:}\n…\n158:fn compose_line(row: &IoLogRow) -> Result<String, String> {\n159:    // A payload containing a newline would otherwise split one row into two, and\n160:    // agent output containing newlines is the ORDINARY case here, not the exotic\n161:    // one. serde_json escapes them, which is why the body is JSON and not TSV.\n162:    let json = serde_json::to_string(row).map_err(|e| e.to_string())?;\n163:    debug_assert!(!json.contains('\\n'));\n164:    Ok(format!(\"{}\\t{}\\n\", row.seq, json))\n165:}\n166:\n167:/// Parse one line back. Answers `None` for anything malformed — a log with one\n168:/// corrupt line must still be readable, because the alternative is a poll that\n169:/// refuses forever over a byte nobody can find.\n170:// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n171:fn parse_line(line: &str) -> Option<IoLogRow> {\n172:    let (seq, json) = line.split_once('\\t')?;\n173:    let seq: u64 = seq.trim().parse().ok()?;\n174:    let mut row: IoLogRow = serde_json::from_str(json).ok()?;\n175:    row.seq = seq;\n176:    Some(row)\n177:}\n…\n199:pub fn last_seq_at(perch_path: &Path) -> u64 {\n200:    let path = io_log_file_at(perch_path);\n201:    let Ok(mut f) = std::fs::File::open(&path) else {\n202:        return 0;\n203:    };\n204:    let Ok(len) = f.metadata().map(|m| m.len()) else {\n205:        return 0;\n206:    };\n207:    if len == 0 {\n208:        return 0;\n209:    }\n210:    let start = len.saturating_sub(TAIL_WINDOW);\n211:    if f.seek(SeekFrom::Start(start)).is_err() {\n212:        return 0;\n213:    }\n214:    let mut buf = String::new();\n215:    if f.read_to_string(&mut buf).is_err() {\n216:        return 0;\n217:    }\n218:    // A window that reached no line start at all fell short of even ONE row;\n219:    // re-read whole rather than answer from a fragment.\n220:    if start > 0 && !buf.contains('\\n') {\n221:        return std::fs::read_to_string(&path)\n222:            .ok()\n223:            .and_then(|s| s.lines().rev().find_map(line_seq))\n224:            .unwrap_or(0);\n225:    }\n226:    let mut lines: Vec<&str> = buf.lines().collect();\n227:    if start > 0 && !lines.is_empty() {\n228:        // The first line in a mid-file window is a fragment of an earlier row.\n229:        lines.remove(0);\n230:    }\n231:    lines.iter().rev().find_map(|l| line_seq(l)).unwrap_or(0)\n232:}\n…\n236:fn first_seq_at(perch_path: &Path) -> u64 {\n237:    let Ok(mut f) = std::fs::File::open(io_log_file_at(perch_path)) else {\n238:        return 0;\n239:    };\n240:    let mut buf = vec![0u8; TAIL_WINDOW as usize];\n241:    let Ok(n) = f.read(&mut buf) else { return 0 };\n242:    buf.truncate(n);\n243:    String::from_utf8_lossy(&buf)\n244:        .lines()\n245:        .find_map(line_seq)\n246:        .unwrap_or(0)\n247:}\n…\n256:pub fn append_at(perch_path: &Path, row: &IoLogRow) -> io::Result<u64> {\n257:    std::fs::create_dir_all(perch_path)?;\n258:    let lock = std::fs::OpenOptions::new()\n259:        .create(true)\n260:        .write(true)\n261:        .truncate(false)\n262:        .open(io_log_lock_at(perch_path))?;\n263:    lock.lock_exclusive()?;\n264:    let result = append_locked(perch_path, row);\n265:    let _ = FileExt::unlock(&lock);\n266:    result\n267:}\n…\n269:fn append_locked(perch_path: &Path, row: &IoLogRow) -> io::Result<u64> {\n270:    let seq = last_seq_at(perch_path).saturating_add(1);\n271:    let mut stamped = row.clone();\n272:    stamped.seq = seq;\n273:    let line = compose_line(&stamped).map_err(io::Error::other)?;\n274:    let mut f = std::fs::OpenOptions::new()\n275:        .create(true)\n276:        .append(true)\n277:        .open(io_log_file_at(perch_path))?;\n278:    f.write_all(line.as_bytes())?;\n279:    // The trim is best-effort ON PURPOSE: a retention sweep that fails must not\n280:    // cost the caller the event it just recorded. An over-long log is a disk\n281:    // cost; a lost event is a hole in the record an adapter cannot detect.\n282:    let _ = trim_locked(perch_path, seq);\n283:    Ok(seq)\n284:}\n…\n291:fn trim_locked(perch_path: &Path, last: u64) -> io::Result<()> {\n292:    let first = first_seq_at(perch_path);\n293:    if first == 0 {\n294:        return Ok(());\n295:    }\n296:    let rows = last.saturating_sub(first).saturating_add(1);\n297:    if rows <= IO_LOG_MAX_ROWS + IO_LOG_TRIM_SLACK {\n298:        return Ok(());\n299:    }\n300:    let keep_from = last.saturating_sub(IO_LOG_MAX_ROWS - 1);\n301:    let path = io_log_file_at(perch_path);\n302:    let body = std::fs::read_to_string(&path)?;\n303:    let kept: String = body\n304:        .lines()\n305:        .filter(|l| line_seq(l).is_some_and(|s| s >= keep_from))\n306:        .map(|l| format!(\"{l}\\n\"))\n307:        .collect();\n308:    crate::atomic::atomic_write_string(&path, &kept).map_err(io::Error::other)\n309:}\n…\n319:pub fn read_after_at(perch_path: &Path, after: u64, limit: Option<usize>) -> Vec<IoLogRow> {\n320:    let lock = std::fs::OpenOptions::new()\n321:        .create(true)\n322:        .write(true)\n323:        .truncate(false)\n324:        .open(io_log_lock_at(perch_path))\n325:        .ok();\n326:    if let Some(l) = lock.as_ref() {\n327:        let _ = l.lock_shared();\n328:    }\n329:    let body = std::fs::read_to_string(io_log_file_at(perch_path)).unwrap_or_default();\n330:    if let Some(l) = lock.as_ref() {\n331:        let _ = FileExt::unlock(l);\n332:    }\n333:    let mut out: Vec<IoLogRow> = Vec::new();\n334:    for line in body.lines() {\n335:        // The cheap prefix test FIRST: an already-seen row costs an integer\n336:        // parse, never a JSON one.\n337:        match line_seq(line) {\n338:            Some(s) if s > after => {}\n339:            _ => continue,\n340:        }\n341:        if let Some(row) = parse_line(line) {\n342:            out.push(row);\n343:        }\n344:        if limit.is_some_and(|n| out.len() >= n) {\n345:            break;\n346:        }\n347:    }\n348:    out\n349:}\n…\n352:mod tests {\n353:    use super::*;\n354:\n355:    fn row(kind: &str, payload: &str) -> IoLogRow {\n356:        IoLogRow {\n357:            seq: 0,\n358:            at_ms: 1_700_000_000_000,\n359:            kind: kind.into(),\n360:            payload: payload.into(),\n361:            truncated: false,\n362:            digest_seq: None,\n363:            peer: None,\n364:            mid: false,\n365:        }\n366:    }\n367:\n368:    // [unit->REQ-IO-MIDTURN-SPAN] A ROW CARRYING A FIELD THIS BINARY DOES NOT\n369:    // KNOW IS READ, NOT SKIPPED — and this is REQUIRED coverage rather than a\n370:    // nicety (gater rider, 2026-08-29), because it is the entire basis on which\n371:    // releases#238 ships `mid` additively instead of behind a version gate.\n372:    //\n373:    // The tolerance is serde's default, which means it is decided by NOBODY\n374:    // unless a test decides it. Add `deny_unknown_fields` to `IoLogRow` and\n375:    // `parse_line` answers `None` for every row a newer core wrote, and\n376:    // `read_after_at` SKIPS a `None` row in silence: the poll would not refuse,\n377:    // it would go quiet about real events. Unpinned, that edit looks like\n378:    // hardening. Pinned, it reddens here.\n379:    //\n380:    // The unknown key used is a REAL future one rather than `zz_bogus`: this is\n381:    // the exact shape an N-1 binary meets when an N core writes a span.\n382:    #[test]\n383:    fn a_row_with_an_unknown_field_is_read_not_skipped() {\n384:        let unknown = r#\"{\"at_ms\":1700000000000,\"kind\":\"AGENT_OUTPUT\",\"payload\":\"hi\",\"tomorrows_field\":true}\"#;\n385:        let got = parse_line(&format!(\"7\\t{unknown}\"));\n386:        assert!(got.is_some(), \"an unknown field must not kill the row\");\n387:        let got = got.unwrap();\n388:        assert_eq!(got.seq, 7);\n389:        assert_eq!(got.payload, \"hi\");\n390:        assert!(!got.mid, \"a field this binary does not know sets nothing\");\n391:    }\n392:\n393:    // [unit->REQ-IO-MIDTURN-SPAN] `mid` survives the line round trip, and is\n394:    // ABSENT from the JSON when false — the property that makes every row\n395:    // written before the field existed read back byte-identically.\n396:    #[test]\n397:    fn the_mid_marker_round_trips_and_is_absent_when_false() {\n398:        let mut r = row(spt_proto::ioevent::IO_KIND_AGENT_OUTPUT, \"span\");\n399:        r.seq = 3;\n400:        let plain = compose_line(&r).unwrap();\n401:        assert!(\n402:            !plain.contains(\"mid\"),\n403:            \"an unset marker must not reach the line: {plain}\"\n404:        );\n405:        r.mid = true;\n406:        let marked = compose_line(&r).unwrap();\n407:        assert!(marked.contains(r#\"\"mid\":true\"#), \"{marked}\");\n408:        let back = parse_line(marked.trim_end()).expect(\"a composed line parses\");\n409:        assert!(back.mid);\n410:        assert_eq!(back.seq, 3);\n411:        assert!(!parse_line(plain.trim_end()).unwrap().mid);\n412:    }\n413:\n414:    fn tmp(name: &str) -> PathBuf {\n415:        let p = std::env::temp_dir().join(format!(\"iolog-{}-{}\", std::process::id(), name));\n416:        let _ = std::fs::remove_dir_all(&p);\n417:        std::fs::create_dir_all(&p).unwrap();\n418:        p\n419:    }\n420:\n421:    // [unit->REQ-IO-EVENT-ADAPTER-LOG] appends assign a contiguous, monotonic\n422:    // seq from 1, and a read with no cursor returns them oldest-first.\n423:    #[test]\n424:    fn appends_assign_monotonic_seqs_from_one() {\n425:        let d = tmp(\"mono\");\n426:        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"a\")).unwrap(), 1);\n427:        assert_eq!(append_at(&d, &row(\"AGENT_OUTPUT\", \"b\")).unwrap(), 2);\n428:        assert_eq!(append_at(&d, &row(\"MSG_IN\", \"c\")).unwrap(), 3);\n429:        let all = read_after_at(&d, 0, None);\n430:        assert_eq!(all.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![1, 2, 3]);\n431:        assert_eq!(\n432:            all.iter().map(|r| r.payload.as_str()).collect::<Vec<_>>(),\n433:            vec![\"a\", \"b\", \"c\"]\n434:        );\n435:    }\n436:\n437:    // [unit->REQ-IO-EVENT-ADAPTER-LOG] THE CURSOR ARM: a read after a seq\n438:    // returns strictly what follows it. Asserted together with the \"cursor at\n439:    // the head returns nothing\" case, because either alone passes an\n440:    // implementation that is uniform the wrong way — a reader that always\n441:    // returns everything passes the first, one that always returns nothing\n442:    // passes the second.\n443:    #[test]\n444:    fn a_cursor_returns_strictly_what_follows_it() {\n445:        let d = tmp(\"cursor\");\n446:        for p in [\"a\", \"b\", \"c\", \"d\"] {\n447:            append_at(&d, &row(\"USER_INPUT\", p)).unwrap();\n448:        }\n449:        let after2 = read_after_at(&d, 2, None);\n450:        assert_eq!(after2.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![3, 4]);\n451:        assert!(\n452:            read_after_at(&d, 4, None).is_empty(),\n453:            \"a cursor at the head sees nothing\"\n454:        );\n455:        let capped = read_after_at(&d, 0, Some(2));\n456:        assert_eq!(capped.len(), 2, \"limit bounds the answer\");\n457:        assert_eq!(capped[0].seq, 1, \"and keeps the OLDEST new rows, so no row is skipped\");\n458:    }\n459:\n460:    // [unit->REQ-IO-EVENT-ADAPTER-LOG] a payload full of newlines is ONE row.\n461:    // Multi-line agent output is the ordinary case here, and a format that let\n462:    // it split would corrupt every later cursor rather than one row.\n463:    #[test]\n464:    fn a_multiline_payload_stays_one_row() {\n465:        let d = tmp(\"multiline\");\n466:        let body = \"line one\\nline two\\ttabbed\\nline three\";\n467:        append_at(&d, &row(\"AGENT_OUTPUT\", body)).unwrap();\n468:        append_at(&d, &row(\"USER_INPUT\", \"next\")).unwrap();\n469:        let all = read_after_at(&d, 0, None);\n470:        assert_eq!(all.len(), 2, \"the newlines did not mint extra rows\");\n471:        assert_eq!(all[0].payload, body, \"and the body round-trips verbatim\");\n472:        assert_eq!(all[1].seq, 2);\n473:    }\n474:\n475:    // [unit->REQ-IO-EVENT-ADAPTER-LOG] the two seqs are different numbers with\n476:    // different spellings, and only the log's own one is the line key.\n477:    #[test]\n478:    fn the_log_seq_and_the_digest_seq_do_not_collide() {\n479:        let d = tmp(\"seqs\");\n480:        let mut r = row(\"AGENT_OUTPUT\", \"body\");\n481:        r.digest_seq = Some(9_999);\n482:        r.truncated = true;\n483:        let assigned = append_at(&d, &r).unwrap();\n484:        assert_eq!(assigned, 1);\n485:        let back = read_after_at(&d, 0, None);\n486:        assert_eq!(back[0].seq, 1, \"the LINE key is the log's own cursor\");\n487:        assert_eq!(\n488:            back[0].digest_seq,\n489:            Some(9_999),\n490:            \"the digest pointer rides untouched\"\n491:        );\n492:        assert!(back[0].truncated);\n493:        // And the JSON body carries exactly one of them.\n494:        let raw = std::fs::read_to_string(io_log_file_at(&d)).unwrap();\n495:        let json = raw.split_once('\\t').unwrap().1;\n496:        assert!(\n497:            !json.contains(\"\\\"seq\\\"\"),\n498:            \"the line key is not duplicated into the body\"\n499:        );\n500:        assert!(json.contains(\"\\\"digest_seq\\\":9999\"));\n501:    }\n502:\n503:    // [unit->REQ-IO-EVENT-ADAPTER-LOG] THE RETENTION ARM, in the two halves that\n504:    // only mean something together: the SLACK is real (the log is allowed past\n505:    // the bound, which is what keeps an append from being a rewrite) and the\n506:    // TRIM target is the bound (not the slack, which would leave the log\n507:    // permanently oversized and rewriting on every further append).\n508:    //\n509:    // Asserting only the second half would pass against an implementation that\n510:    // trims on EVERY append — correct output, quadratic cost, and no test would\n511:    // notice. Asserting only the first would pass against one that never trims\n512:    // at all.\n513:    #[test]\n514:    fn the_log_trims_oldest_first_at_the_bound() {\n515:        let d = tmp(\"trim\");\n516:        // ── Half one: exactly bound+slack rows, and NOTHING has been dropped.\n517:        let brim = IO_LOG_MAX_ROWS + IO_LOG_TRIM_SLACK;\n518:        for i in 1..=brim {\n519:            append_at(&d, &row(\"USER_INPUT\", &format!(\"p{i}\"))).unwrap();\n520:        }\n521:        let at_brim = read_after_at(&d, 0, None);\n522:        assert_eq!(\n523:            at_brim.len() as u64,\n524:            brim,\n525:            \"the slack is REAL — the log runs past the bound before it rewrites\"\n526:        );\n527:        assert_eq!(at_brim.first().unwrap().seq, 1, \"and the first row is still row 1\");\n528:\n529:        // ── Half two: ONE more append crosses it, and the trim lands on the\n530:        //    BOUND rather than merely back under the slack.\n531:        let total = brim + 1;\n532:        append_at(&d, &row(\"USER_INPUT\", &format!(\"p{total}\"))).unwrap();\n533:        let all = read_after_at(&d, 0, None);\n534:        assert_eq!(\n535:            all.len() as u64,\n536:            IO_LOG_MAX_ROWS,\n537:            \"trimmed back to the BOUND, not merely to the slack\"\n538:        );\n539:        assert_eq!(all.last().unwrap().seq, total, \"the newest row survives\");\n540:        assert_eq!(\n541:            all.first().unwrap().seq,\n542:            total - IO_LOG_MAX_ROWS + 1,\n543:            \"and the oldest surviving row is exactly the bound back — oldest-first\"\n544:        );\n545:        assert_eq!(last_seq_at(&d), total, \"seqs never rewind over a trim\");\n546:        assert_eq!(\n547:            read_after_at(&d, 1, None).len() as u64,\n548:            IO_LOG_MAX_ROWS,\n549:            \"a cursor into the DROPPED region still sees everything that survives\"\n550:        );\n551:\n552:        // ── And the standing invariant the two halves imply: however many more\n553:        //    appends land, the log never exceeds bound+slack.\n554:        for i in 1..=(IO_LOG_TRIM_SLACK + 5) {\n555:            append_at(&d, &row(\"USER_INPUT\", &format!(\"q{i}\"))).unwrap();\n556:        }\n557:        assert!(\n558:            (read_after_at(&d, 0, None).len() as u64) <= brim,\n559:            \"the retention ceiling holds across the slack cycle\"\n560:        );\n561:    }\n562:\n563:    // [unit->REQ-IO-EVENT-ADAPTER-LOG] a corrupt line is skipped, not fatal. A\n564:    // poll that refuses forever over one bad byte is worse than a missing row,\n565:    // and the seq assignment must still move past it.\n566:    #[test]\n567:    fn a_corrupt_line_is_skipped_not_fatal() {\n568:        let d = tmp(\"corrupt\");\n569:        append_at(&d, &row(\"USER_INPUT\", \"good\")).unwrap();\n570:        let path = io_log_file_at(&d);\n571:        let mut body = std::fs::read_to_string(&path).unwrap();\n572:        body.push_str(\"2\\tnot json at all\\n\");\n573:        std::fs::write(&path, &body).unwrap();\n574:        let seq = append_at(&d, &row(\"USER_INPUT\", \"after\")).unwrap();\n575:        assert_eq!(seq, 3, \"the seq walk read the PREFIX, which was intact\");\n576:        let rows = read_after_at(&d, 0, None);\n577:        assert_eq!(rows.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![1, 3]);\n578:    }\n579:}"}],"details":{"displayContent":{"text":"use std::path::{Path, PathBuf};\n\nuse fs2::FileExt;\n…\npub struct IoLogRow {\n    /// This log's own cursor for the row — the LINE KEY, carried in the line's\n    /// tab-delimited prefix and never in the JSON body.\n    #[serde(skip)]\n    pub seq: u64,\n    /// Epoch-ms at which the sink recorded the event.\n    pub at_ms: u64,\n    /// A [`spt_proto::ioevent`] vocabulary token.\n    pub kind: String,\n    /// The event's content, ALREADY BOUNDED to the 16KB class.\n    pub payload: String,\n    /// Whether [`Self::payload`] is shorter than the observation it came from.\n    #[serde(default, skip_serializing_if = \"std::ops::Not::not\")]\n    pub truncated: bool,\n    /// The DIGEST's seq — where the untruncated content lives, when the session\n    /// had one to point at. Unrelated to [`Self::seq`].\n    #[serde(default, skip_serializing_if = \"Option::is_none\")]\n    pub digest_seq: Option<u64>,\n    /// The other endpoint, for the kinds that have one.\n    #[serde(default, skip_serializing_if = \"Option::is_none\")]\n    pub peer: Option<String>,\n    /// This `AGENT_OUTPUT` row is a MID-TURN SPAN, not the turn's closing\n    /// report (releases#238). Skipped when false, so every row written before\n    /// this field existed reads back identically and an older reader — which\n    /// drops the key entirely, see the module docs — degrades to counting a\n    /// span as a close rather than to a parse failure.\n    // [impl->REQ-IO-MIDTURN-SPAN]\n    #[serde(default, skip_serializing_if = \"std::ops::Not::not\")]\n    pub mid: bool,\n}\n…\nfn compose_line(row: &IoLogRow) -> Result<String, String> {\n    // A payload containing a newline would otherwise split one row into two, and\n    // agent output containing newlines is the ORDINARY case here, not the exotic\n    // one. serde_json escapes them, which is why the body is JSON and not TSV.\n    let json = serde_json::to_string(row).map_err(|e| e.to_string())?;\n    debug_assert!(!json.contains('\\n'));\n    Ok(format!(\"{}\\t{}\\n\", row.seq, json))\n}\n\n/// Parse one line back. Answers `None` for anything malformed — a log with one\n/// corrupt line must still be readable, because the alternative is a poll that\n/// refuses forever over a byte nobody can find.\n// [impl->REQ-IO-EVENT-ADAPTER-LOG]\nfn parse_line(line: &str) -> Option<IoLogRow> {\n    let (seq, json) = line.split_once('\\t')?;\n    let seq: u64 = seq.trim().parse().ok()?;\n    let mut row: IoLogRow = serde_json::from_str(json).ok()?;\n    row.seq = seq;\n    Some(row)\n}\n…\npub fn last_seq_at(perch_path: &Path) -> u64 {\n    let path = io_log_file_at(perch_path);\n    let Ok(mut f) = std::fs::File::open(&path) else {\n        return 0;\n    };\n    let Ok(len) = f.metadata().map(|m| m.len()) else {\n        return 0;\n    };\n    if len == 0 {\n        return 0;\n    }\n    let start = len.saturating_sub(TAIL_WINDOW);\n    if f.seek(SeekFrom::Start(start)).is_err() {\n        return 0;\n    }\n    let mut buf = String::new();\n    if f.read_to_string(&mut buf).is_err() {\n        return 0;\n    }\n    // A window that reached no line start at all fell short of even ONE row;\n    // re-read whole rather than answer from a fragment.\n    if start > 0 && !buf.contains('\\n') {\n        return std::fs::read_to_string(&path)\n            .ok()\n            .and_then(|s| s.lines().rev().find_map(line_seq))\n            .unwrap_or(0);\n    }\n    let mut lines: Vec<&str> = buf.lines().collect();\n    if start > 0 && !lines.is_empty() {\n        // The first line in a mid-file window is a fragment of an earlier row.\n        lines.remove(0);\n    }\n    lines.iter().rev().find_map(|l| line_seq(l)).unwrap_or(0)\n}\n…\nfn first_seq_at(perch_path: &Path) -> u64 {\n    let Ok(mut f) = std::fs::File::open(io_log_file_at(perch_path)) else {\n        return 0;\n    };\n    let mut buf = vec![0u8; TAIL_WINDOW as usize];\n    let Ok(n) = f.read(&mut buf) else { return 0 };\n    buf.truncate(n);\n    String::from_utf8_lossy(&buf)\n        .lines()\n        .find_map(line_seq)\n        .unwrap_or(0)\n}\n…\npub fn append_at(perch_path: &Path, row: &IoLogRow) -> io::Result<u64> {\n    std::fs::create_dir_all(perch_path)?;\n    let lock = std::fs::OpenOptions::new()\n        .create(true)\n        .write(true)\n        .truncate(false)\n        .open(io_log_lock_at(perch_path))?;\n    lock.lock_exclusive()?;\n    let result = append_locked(perch_path, row);\n    let _ = FileExt::unlock(&lock);\n    result\n}\n…\nfn append_locked(perch_path: &Path, row: &IoLogRow) -> io::Result<u64> {\n    let seq = last_seq_at(perch_path).saturating_add(1);\n    let mut stamped = row.clone();\n    stamped.seq = seq;\n    let line = compose_line(&stamped).map_err(io::Error::other)?;\n    let mut f = std::fs::OpenOptions::new()\n        .create(true)\n        .append(true)\n        .open(io_log_file_at(perch_path))?;\n    f.write_all(line.as_bytes())?;\n    // The trim is best-effort ON PURPOSE: a retention sweep that fails must not\n    // cost the caller the event it just recorded. An over-long log is a disk\n    // cost; a lost event is a hole in the record an adapter cannot detect.\n    let _ = trim_locked(perch_path, seq);\n    Ok(seq)\n}\n…\nfn trim_locked(perch_path: &Path, last: u64) -> io::Result<()> {\n    let first = first_seq_at(perch_path);\n    if first == 0 {\n        return Ok(());\n    }\n    let rows = last.saturating_sub(first).saturating_add(1);\n    if rows <= IO_LOG_MAX_ROWS + IO_LOG_TRIM_SLACK {\n        return Ok(());\n    }\n    let keep_from = last.saturating_sub(IO_LOG_MAX_ROWS - 1);\n    let path = io_log_file_at(perch_path);\n    let body = std::fs::read_to_string(&path)?;\n    let kept: String = body\n        .lines()\n        .filter(|l| line_seq(l).is_some_and(|s| s >= keep_from))\n        .map(|l| format!(\"{l}\\n\"))\n        .collect();\n    crate::atomic::atomic_write_string(&path, &kept).map_err(io::Error::other)\n}\n…\npub fn read_after_at(perch_path: &Path, after: u64, limit: Option<usize>) -> Vec<IoLogRow> {\n    let lock = std::fs::OpenOptions::new()\n        .create(true)\n        .write(true)\n        .truncate(false)\n        .open(io_log_lock_at(perch_path))\n        .ok();\n    if let Some(l) = lock.as_ref() {\n        let _ = l.lock_shared();\n    }\n    let body = std::fs::read_to_string(io_log_file_at(perch_path)).unwrap_or_default();\n    if let Some(l) = lock.as_ref() {\n        let _ = FileExt::unlock(l);\n    }\n    let mut out: Vec<IoLogRow> = Vec::new();\n    for line in body.lines() {\n        // The cheap prefix test FIRST: an already-seen row costs an integer\n        // parse, never a JSON one.\n        match line_seq(line) {\n            Some(s) if s > after => {}\n            _ => continue,\n        }\n        if let Some(row) = parse_line(line) {\n            out.push(row);\n        }\n        if limit.is_some_and(|n| out.len() >= n) {\n            break;\n        }\n    }\n    out\n}\n…\nmod tests {\n    use super::*;\n\n    fn row(kind: &str, payload: &str) -> IoLogRow {\n        IoLogRow {\n            seq: 0,\n            at_ms: 1_700_000_000_000,\n            kind: kind.into(),\n            payload: payload.into(),\n            truncated: false,\n            digest_seq: None,\n            peer: None,\n            mid: false,\n        }\n    }\n\n    // [unit->REQ-IO-MIDTURN-SPAN] A ROW CARRYING A FIELD THIS BINARY DOES NOT\n    // KNOW IS READ, NOT SKIPPED — and this is REQUIRED coverage rather than a\n    // nicety (gater rider, 2026-08-29), because it is the entire basis on which\n    // releases#238 ships `mid` additively instead of behind a version gate.\n    //\n    // The tolerance is serde's default, which means it is decided by NOBODY\n    // unless a test decides it. Add `deny_unknown_fields` to `IoLogRow` and\n    // `parse_line` answers `None` for every row a newer core wrote, and\n    // `read_after_at` SKIPS a `None` row in silence: the poll would not refuse,\n    // it would go quiet about real events. Unpinned, that edit looks like\n    // hardening. Pinned, it reddens here.\n    //\n    // The unknown key used is a REAL future one rather than `zz_bogus`: this is\n    // the exact shape an N-1 binary meets when an N core writes a span.\n    #[test]\n    fn a_row_with_an_unknown_field_is_read_not_skipped() {\n        let unknown = r#\"{\"at_ms\":1700000000000,\"kind\":\"AGENT_OUTPUT\",\"payload\":\"hi\",\"tomorrows_field\":true}\"#;\n        let got = parse_line(&format!(\"7\\t{unknown}\"));\n        assert!(got.is_some(), \"an unknown field must not kill the row\");\n        let got = got.unwrap();\n        assert_eq!(got.seq, 7);\n        assert_eq!(got.payload, \"hi\");\n        assert!(!got.mid, \"a field this binary does not know sets nothing\");\n    }\n\n    // [unit->REQ-IO-MIDTURN-SPAN] `mid` survives the line round trip, and is\n    // ABSENT from the JSON when false — the property that makes every row\n    // written before the field existed read back byte-identically.\n    #[test]\n    fn the_mid_marker_round_trips_and_is_absent_when_false() {\n        let mut r = row(spt_proto::ioevent::IO_KIND_AGENT_OUTPUT, \"span\");\n        r.seq = 3;\n        let plain = compose_line(&r).unwrap();\n        assert!(\n            !plain.contains(\"mid\"),\n            \"an unset marker must not reach the line: {plain}\"\n        );\n        r.mid = true;\n        let marked = compose_line(&r).unwrap();\n        assert!(marked.contains(r#\"\"mid\":true\"#), \"{marked}\");\n        let back = parse_line(marked.trim_end()).expect(\"a composed line parses\");\n        assert!(back.mid);\n        assert_eq!(back.seq, 3);\n        assert!(!parse_line(plain.trim_end()).unwrap().mid);\n    }\n\n    fn tmp(name: &str) -> PathBuf {\n        let p = std::env::temp_dir().join(format!(\"iolog-{}-{}\", std::process::id(), name));\n        let _ = std::fs::remove_dir_all(&p);\n        std::fs::create_dir_all(&p).unwrap();\n        p\n    }\n\n    // [unit->REQ-IO-EVENT-ADAPTER-LOG] appends assign a contiguous, monotonic\n    // seq from 1, and a read with no cursor returns them oldest-first.\n    #[test]\n    fn appends_assign_monotonic_seqs_from_one() {\n        let d = tmp(\"mono\");\n        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"a\")).unwrap(), 1);\n        assert_eq!(append_at(&d, &row(\"AGENT_OUTPUT\", \"b\")).unwrap(), 2);\n        assert_eq!(append_at(&d, &row(\"MSG_IN\", \"c\")).unwrap(), 3);\n        let all = read_after_at(&d, 0, None);\n        assert_eq!(all.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![1, 2, 3]);\n        assert_eq!(\n            all.iter().map(|r| r.payload.as_str()).collect::<Vec<_>>(),\n            vec![\"a\", \"b\", \"c\"]\n        );\n    }\n\n    // [unit->REQ-IO-EVENT-ADAPTER-LOG] THE CURSOR ARM: a read after a seq\n    // returns strictly what follows it. Asserted together with the \"cursor at\n    // the head returns nothing\" case, because either alone passes an\n    // implementation that is uniform the wrong way — a reader that always\n    // returns everything passes the first, one that always returns nothing\n    // passes the second.\n    #[test]\n    fn a_cursor_returns_strictly_what_follows_it() {\n        let d = tmp(\"cursor\");\n        for p in [\"a\", \"b\", \"c\", \"d\"] {\n            append_at(&d, &row(\"USER_INPUT\", p)).unwrap();\n        }\n        let after2 = read_after_at(&d, 2, None);\n        assert_eq!(after2.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![3, 4]);\n        assert!(\n            read_after_at(&d, 4, None).is_empty(),\n            \"a cursor at the head sees nothing\"\n        );\n        let capped = read_after_at(&d, 0, Some(2));\n        assert_eq!(capped.len(), 2, \"limit bounds the answer\");\n        assert_eq!(capped[0].seq, 1, \"and keeps the OLDEST new rows, so no row is skipped\");\n    }\n\n    // [unit->REQ-IO-EVENT-ADAPTER-LOG] a payload full of newlines is ONE row.\n    // Multi-line agent output is the ordinary case here, and a format that let\n    // it split would corrupt every later cursor rather than one row.\n    #[test]\n    fn a_multiline_payload_stays_one_row() {\n        let d = tmp(\"multiline\");\n        let body = \"line one\\nline two\\ttabbed\\nline three\";\n        append_at(&d, &row(\"AGENT_OUTPUT\", body)).unwrap();\n        append_at(&d, &row(\"USER_INPUT\", \"next\")).unwrap();\n        let all = read_after_at(&d, 0, None);\n        assert_eq!(all.len(), 2, \"the newlines did not mint extra rows\");\n        assert_eq!(all[0].payload, body, \"and the body round-trips verbatim\");\n        assert_eq!(all[1].seq, 2);\n    }\n\n    // [unit->REQ-IO-EVENT-ADAPTER-LOG] the two seqs are different numbers with\n    // different spellings, and only the log's own one is the line key.\n    #[test]\n    fn the_log_seq_and_the_digest_seq_do_not_collide() {\n        let d = tmp(\"seqs\");\n        let mut r = row(\"AGENT_OUTPUT\", \"body\");\n        r.digest_seq = Some(9_999);\n        r.truncated = true;\n        let assigned = append_at(&d, &r).unwrap();\n        assert_eq!(assigned, 1);\n        let back = read_after_at(&d, 0, None);\n        assert_eq!(back[0].seq, 1, \"the LINE key is the log's own cursor\");\n        assert_eq!(\n            back[0].digest_seq,\n            Some(9_999),\n            \"the digest pointer rides untouched\"\n        );\n        assert!(back[0].truncated);\n        // And the JSON body carries exactly one of them.\n        let raw = std::fs::read_to_string(io_log_file_at(&d)).unwrap();\n        let json = raw.split_once('\\t').unwrap().1;\n        assert!(\n            !json.contains(\"\\\"seq\\\"\"),\n            \"the line key is not duplicated into the body\"\n        );\n        assert!(json.contains(\"\\\"digest_seq\\\":9999\"));\n    }\n\n    // [unit->REQ-IO-EVENT-ADAPTER-LOG] THE RETENTION ARM, in the two halves that\n    // only mean something together: the SLACK is real (the log is allowed past\n    // the bound, which is what keeps an append from being a rewrite) and the\n    // TRIM target is the bound (not the slack, which would leave the log\n    // permanently oversized and rewriting on every further append).\n    //\n    // Asserting only the second half would pass against an implementation that\n    // trims on EVERY append — correct output, quadratic cost, and no test would\n    // notice. Asserting only the first would pass against one that never trims\n    // at all.\n    #[test]\n    fn the_log_trims_oldest_first_at_the_bound() {\n        let d = tmp(\"trim\");\n        // ── Half one: exactly bound+slack rows, and NOTHING has been dropped.\n        let brim = IO_LOG_MAX_ROWS + IO_LOG_TRIM_SLACK;\n        for i in 1..=brim {\n            append_at(&d, &row(\"USER_INPUT\", &format!(\"p{i}\"))).unwrap();\n        }\n        let at_brim = read_after_at(&d, 0, None);\n        assert_eq!(\n            at_brim.len() as u64,\n            brim,\n            \"the slack is REAL — the log runs past the bound before it rewrites\"\n        );\n        assert_eq!(at_brim.first().unwrap().seq, 1, \"and the first row is still row 1\");\n\n        // ── Half two: ONE more append crosses it, and the trim lands on the\n        //    BOUND rather than merely back under the slack.\n        let total = brim + 1;\n        append_at(&d, &row(\"USER_INPUT\", &format!(\"p{total}\"))).unwrap();\n        let all = read_after_at(&d, 0, None);\n        assert_eq!(\n            all.len() as u64,\n            IO_LOG_MAX_ROWS,\n            \"trimmed back to the BOUND, not merely to the slack\"\n        );\n        assert_eq!(all.last().unwrap().seq, total, \"the newest row survives\");\n        assert_eq!(\n            all.first().unwrap().seq,\n            total - IO_LOG_MAX_ROWS + 1,\n            \"and the oldest surviving row is exactly the bound back — oldest-first\"\n        );\n        assert_eq!(last_seq_at(&d), total, \"seqs never rewind over a trim\");\n        assert_eq!(\n            read_after_at(&d, 1, None).len() as u64,\n            IO_LOG_MAX_ROWS,\n            \"a cursor into the DROPPED region still sees everything that survives\"\n        );\n\n        // ── And the standing invariant the two halves imply: however many more\n        //    appends land, the log never exceeds bound+slack.\n        for i in 1..=(IO_LOG_TRIM_SLACK + 5) {\n            append_at(&d, &row(\"USER_INPUT\", &format!(\"q{i}\"))).unwrap();\n        }\n        assert!(\n            (read_after_at(&d, 0, None).len() as u64) <= brim,\n            \"the retention ceiling holds across the slack cycle\"\n        );\n    }\n\n    // [unit->REQ-IO-EVENT-ADAPTER-LOG] a corrupt line is skipped, not fatal. A\n    // poll that refuses forever over one bad byte is worse than a missing row,\n    // and the seq assignment must still move past it.\n    #[test]\n    fn a_corrupt_line_is_skipped_not_fatal() {\n        let d = tmp(\"corrupt\");\n        append_at(&d, &row(\"USER_INPUT\", \"good\")).unwrap();\n        let path = io_log_file_at(&d);\n        let mut body = std::fs::read_to_string(&path).unwrap();\n        body.push_str(\"2\\tnot json at all\\n\");\n        std::fs::write(&path, &body).unwrap();\n        let seq = append_at(&d, &row(\"USER_INPUT\", \"after\")).unwrap();\n        assert_eq!(seq, 3, \"the seq walk read the PREFIX, which was intact\");\n        let rows = read_after_at(&d, 0, None);\n        assert_eq!(rows.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![1, 3]);\n    }\n}","startLine":34,"lineNumbers":[34,35,36,null,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,null,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,null,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,null,236,237,238,239,240,241,242,243,244,245,246,247,null,256,257,258,259,260,261,262,263,264,265,266,267,null,269,270,271,272,273,274,275,276,277,278,279,280,281,282,283,284,null,291,292,293,294,295,296,297,298,299,300,301,302,303,304,305,306,307,308,309,null,319,320,321,322,323,324,325,326,327,328,329,330,331,332,333,334,335,336,337,338,339,340,341,342,343,344,345,346,347,348,349,null,352,353,354,355,356,357,358,359,360,361,362,363,364,365,366,367,368,369,370,371,372,373,374,375,376,377,378,379,380,381,382,383,384,385,386,387,388,389,390,391,392,393,394,395,396,397,398,399,400,401,402,403,404,405,406,407,408,409,410,411,412,413,414,415,416,417,418,419,420,421,422,423,424,425,426,427,428,429,430,431,432,433,434,435,436,437,438,439,440,441,442,443,444,445,446,447,448,449,450,451,452,453,454,455,456,457,458,459,460,461,462,463,464,465,466,467,468,469,470,471,472,473,474,475,476,477,478,479,480,481,482,483,484,485,486,487,488,489,490,491,492,493,494,495,496,497,498,499,500,501,502,503,504,505,506,507,508,509,510,511,512,513,514,515,516,517,518,519,520,521,522,523,524,525,526,527,528,529,530,531,532,533,534,535,536,537,538,539,540,541,542,543,544,545,546,547,548,549,550,551,552,553,554,555,556,557,558,559,560,561,562,563,564,565,566,567,568,569,570,571,572,573,574,575,576,577,578,579]},"fileSize":26522,"meta":{"source":{"type":"path","value":"C:/Users/decid/Documents/projects/spt-core/.worktrees/iolog-277/crates/spt-store/src/iolog.rs"}}},"isError":false,"timestamp":1788696616055}}
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{"type":"message","id":"37b00455","parentId":"7e124e37","timestamp":"2026-09-06T12:10:21.248Z","message":{"role":"toolResult","toolCallId":"call_HkGTLN2LoZnNsPKT0B0thwF6|fc_0a8f6f40d1e69e19016a9d582c469487d28ad1819f42a8b0f2","toolName":"grep","content":[{"type":"text","text":"[.worktrees/iolog-277/crates/spt-store/src/atomic.rs#4C8C]\n 57:// [impl->REQ-HAZARD-EBUSY-RENAME]\n*58:pub fn atomic_write_string(path: &Path, body: &str) -> io::Result<()> {\n 59:    atomic_write_bytes(path, body.as_bytes())\n 60:}\n 61:\n...\n 82:// [impl->REQ-HAZARD-EBUSY-RENAME]\n*83:pub fn atomic_write_bytes(path: &Path, body: &[u8]) -> io::Result<()> {\n 84:    write_then_rename(path, body, false)\n 85:}\n 86:\n...\n 107:// [impl->REQ-HAZARD-PERCH-RECORD-POWER-LOSS]\n*108:pub fn atomic_write_bytes_durable(path: &Path, body: &[u8]) -> io::Result<()> {\n 109:    write_then_rename(path, body, true)\n 110:}\n 111:\n...\n 113:// [impl->REQ-HAZARD-PERCH-RECORD-POWER-LOSS]\n*114:pub fn atomic_write_string_durable(path: &Path, body: &str) -> io::Result<()> {\n 115:    atomic_write_bytes_durable(path, body.as_bytes())\n 116:}\n 117:"}],"details":{"scopePath":".worktrees/iolog-277/crates/spt-store/src/atomic.rs","searchPath":"C:/Users/decid/Documents/projects/spt-core/.worktrees/iolog-277/crates/spt-store/src/atomic.rs","cwd":"C:\\Users\\decid\\Documents\\projects\\spt-core","matchCount":4,"fileCount":1,"files":[".worktrees/iolog-277/crates/spt-store/src/atomic.rs"],"fileMatches":[{"path":".worktrees/iolog-277/crates/spt-store/src/atomic.rs","count":4}],"truncated":false,"displayContent":"  57│// [impl->REQ-HAZARD-EBUSY-RENAME]\n *58│pub fn atomic_write_string(path: &Path, body: &str) -> io::Result<()> {\n  59│    atomic_write_bytes(path, body.as_bytes())\n  60│}\n  61│\n    │...\n  82│// [impl->REQ-HAZARD-EBUSY-RENAME]\n *83│pub fn atomic_write_bytes(path: &Path, body: &[u8]) -> io::Result<()> {\n  84│    write_then_rename(path, body, false)\n  85│}\n  86│\n    │...\n 107│// [impl->REQ-HAZARD-PERCH-RECORD-POWER-LOSS]\n*108│pub fn atomic_write_bytes_durable(path: &Path, body: &[u8]) -> io::Result<()> {\n 109│    write_then_rename(path, body, true)\n 110│}\n 111│\n    │...\n 113│// [impl->REQ-HAZARD-PERCH-RECORD-POWER-LOSS]\n*114│pub fn atomic_write_string_durable(path: &Path, body: &str) -> io::Result<()> {\n 115│    atomic_write_bytes_durable(path, body.as_bytes())\n 116│}\n 117│"},"isError":false,"timestamp":1788696621248}}
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{"type":"message","id":"69157bdd","parentId":"0f099f8f","timestamp":"2026-09-06T12:11:54.133Z","message":{"role":"assistant","content":[{"type":"thinking","thinking":"**Designing append byte scan**\n\n**Designing repair retention**\n\n**Designing append scan state**"},{"type":"thinking","thinking":"**Communicating repair design**"},{"type":"toolCall","id":"call_BjD0WNSYRgES2nigpAREtjOa|ctc_0a8f6f40d1e69e19016a9d5854540087d28e2f894c7f411138","name":"edit","arguments":{"input":"*** Begin Patch\n[C:/Users/decid/Documents/projects/spt-core/.worktrees/iolog-277/crates/spt-store/src/iolog.rs#F599]\nPUT >142:\n+\n+/// A poll's selected rows and the global prefix maximum from the same snapshot.\n+#[derive(Debug, Default)]\n+pub struct IoLogRead {\n+    pub rows: Vec<IoLogRow>,\n+    /// Independent of the cursor, output limit, and whether row JSON parses.\n+    pub head: u64,\n+}\nPUT 193.=197:\n+/// The highest seq in the complete rows of the tail window, or 0 if empty.\n+///\n+/// Healthy logs are increasing, so this is their head. Append integrity and\n+/// poll snapshots scan all prefixes instead: a damaged log's older maximum can\n+/// lie outside this window.\nPUT >198:\n+// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\nPUT 214.=231:\n+    let mut buf = Vec::new();\n+    if f.read_to_end(&mut buf).is_err() {\n+        return 0;\n+    }\n+    let complete = if start > 0 {\n+        // Drop the fragment BEFORE decoding: the seek can bisect a codepoint.\n+        match buf.iter().position(|&b| b == b'\\n') {\n+            Some(end) if end + 1 < buf.len() => &buf[end + 1..],\n+            _ => {\n+                // No complete row remains, including a window ending at the\n+                // only row's newline. Read whole rather than answer falsely 0.\n+                return std::fs::read(&path)\n+                    .ok()\n+                    .map(|bytes| {\n+                        String::from_utf8_lossy(&bytes)\n+                            .lines()\n+                            .filter_map(line_seq)\n+                            .max()\n+                            .unwrap_or(0)\n+                    })\n+                    .unwrap_or(0);\n+            }\n+        }\n+    } else {\n+        &buf[..]\n+    };\n+    String::from_utf8_lossy(complete)\n+        .lines()\n+        .filter_map(line_seq)\n+        .max()\n+        .unwrap_or(0)\nPUT 234.=247:\n+/// Read only the ASCII sequence prefix; payload bytes need not decode.\n+fn byte_line_seq(line: &[u8]) -> Option<u64> {\n+    let tab = line.iter().position(|&b| b == b'\\t')?;\n+    std::str::from_utf8(&line[..tab]).ok()?.trim().parse().ok()\n+}\n+\n+/// One full read supplies integrity, global maximum, retention count, and any\n+/// rewrite bytes. Healthy logs are bounded to 1250 rows (about 20MB at the\n+/// payload cap); legacy oversized logs pay their full scan until repaired.\n+/// Endpoints alone cannot prove integrity: 1, 2, 1, 3 has increasing endpoints.\n+// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+struct LogScan {\n+    body: Vec<u8>,\n+    rows: usize,\n+    head: u64,\n+    damaged: bool,\n+}\n+\n+impl LogScan {\n+    fn read(path: &Path) -> io::Result<Self> {\n+        let body = match std::fs::read(path) {\n+            Ok(body) => body,\n+            Err(e) if e.kind() == io::ErrorKind::NotFound => Vec::new(),\n+            Err(e) => return Err(e),\n+        };\n+        let mut rows = 0;\n+        let mut head = 0;\n+        let mut previous = None;\n+        let mut damaged = false;\n+        for line in body.split_inclusive(|&b| b == b'\\n') {\n+            rows += 1;\n+            if let Some(seq) = byte_line_seq(line) {\n+                damaged |= previous.is_some_and(|prev| seq <= prev);\n+                previous = Some(seq);\n+                head = head.max(seq);\n+            }\n+        }\n+        Ok(Self { body, rows, head, damaged })\n+    }\n+}\n+\n+fn next_seq(seq: u64) -> io::Result<u64> {\n+    seq.checked_add(1)\n+        .ok_or_else(|| io::Error::other(\"io-events sequence exhausted\"))\n+}\nPUT 269.=284:\n+// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n+fn append_locked(perch_path: &Path, row: &IoLogRow) -> io::Result<u64> {\n+    let path = io_log_file_at(perch_path);\n+    let mut scan = LogScan::read(&path)?;\n+    let mut repaired = None;\n+    if scan.damaged {\n+        // Repair only retained history, in file order, above EVERY old prefix.\n+        // Old cursors see this history once; normal positional retention bounds\n+        // that replay. Never deserialize/reserialize the JSON half.\n+        let keep = retained_rows(scan.rows);\n+        let mut body = Vec::with_capacity(scan.body.len());\n+        for line in scan.body.split_inclusive(|&b| b == b'\\n').skip(scan.rows - keep) {\n+            if byte_line_seq(line).is_some() {\n+                scan.head = next_seq(scan.head)?;\n+                let tab = line.iter().position(|&b| b == b'\\t').unwrap();\n+                write!(&mut body, \"{}\", scan.head)?;\n+                body.extend_from_slice(&line[tab..]);\n+            } else {\n+                // Corrupt unkeyed lines remain unreadable, but are not lost.\n+                body.extend_from_slice(line);\n+            }\n+        }\n+        scan.rows = keep;\n+        repaired = Some(body);\n+    }\n+    // Preflight the entire repair AND new row before mutating the file: neither\n+    // saturation nor a partially committed repair may consume the last cursor.\n+    let seq = next_seq(scan.head)?;\n+    let mut stamped = row.clone();\n+    stamped.seq = seq;\n+    let line = compose_line(&stamped).map_err(io::Error::other)?;\n+    if let Some(body) = repaired {\n+        crate::atomic::atomic_write_bytes(&path, &body)?;\n+        scan.body = body;\n+    }\n+    let mut f = std::fs::OpenOptions::new()\n+        .create(true)\n+        .append(true)\n+        .open(&path)?;\n+    // An externally damaged final line must not absorb the appended prefix.\n+    if !scan.body.is_empty() && !scan.body.ends_with(b\"\\n\") {\n+        f.write_all(b\"\\n\")?;\n+        scan.body.push(b'\\n');\n+    }\n+    f.write_all(line.as_bytes())?;\n+    drop(f);\n+    // Retention remains best-effort after the event is safely appended. Reuse\n+    // the scan bytes rather than reading the entire file again for a trim.\n+    scan.rows += 1;\n+    if retained_rows(scan.rows) < scan.rows {\n+        scan.body.extend_from_slice(line.as_bytes());\n+        let _ = trim_locked(perch_path, &scan.body, scan.rows);\n+    }\n+    Ok(seq)\n+}\nPUT 288.=309:\n+/// Count physical lines, not sequence distance; reset blocks need exactly the\n+/// same newest-N retention as healthy logs.\n+// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n+// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+fn retained_rows(rows: usize) -> usize {\n+    if rows as u64 > IO_LOG_MAX_ROWS + IO_LOG_TRIM_SLACK {\n+        IO_LOG_MAX_ROWS as usize\n+    } else {\n+        rows\n+    }\n+}\n+\n+// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n+// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+fn trim_locked(perch_path: &Path, body: &[u8], rows: usize) -> io::Result<()> {\n+    let drop = rows - retained_rows(rows);\n+    if drop == 0 {\n+        return Ok(());\n+    }\n+    let offset = body\n+        .split_inclusive(|&b| b == b'\\n')\n+        .take(drop)\n+        .map(<[u8]>::len)\n+        .sum::<usize>();\n+    crate::atomic::atomic_write_bytes(&io_log_file_at(perch_path), &body[offset..])\n+}\nPUT >318:\n+// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\nPUT 319.=319:\n+pub fn read_after_at(perch_path: &Path, after: u64, limit: Option<usize>) -> IoLogRead {\nPUT 329.=329:\n+    let body = std::fs::read(io_log_file_at(perch_path)).unwrap_or_default();\nPUT 333.=348:\n+    let mut out = IoLogRead::default();\n+    for line in body.split_inclusive(|&b| b == b'\\n') {\n+        // Keep scanning prefixes after the limit: head belongs to this entire\n+        // shared-lock snapshot, not the last delivered (or decodable) row.\n+        let Some(seq) = byte_line_seq(line) else { continue };\n+        out.head = out.head.max(seq);\n+        if seq <= after || limit.is_some_and(|n| out.rows.len() >= n) {\n+            continue;\n+        }\n+        if let Some(row) = parse_line(&String::from_utf8_lossy(line)) {\n+            out.rows.push(row);\n+        }\n+    }\n+    out\n*** End 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append byte scan**"},{"type":"summary_text","text":"**Designing repair retention**"},{"type":"summary_text","text":"**Designing append scan state**"}],"metadata":{"turn_id":"26ffcdc1-acc4-4471-b1c2-0679cc034519"}},{"id":"rs_0a8f6f40d1e69e19016a9d584dc30487d2a460f542b29e676a","type":"reasoning","content":[],"encrypted_content":"gAAAAABqnVhUBvTrZdwwwBcFsRKRycHzYntul6tUg1JAUbMtXukXvpwjT7yifTGt_czHHyIfStRbEmFQAqdNVmg7u8GSv38u97oDPCC6WkVbPLlbgHz4fHi8utIAr1MoadHeLIvhW7B7Hs7wpLp7o-HDKVEqjVN_mu-RyCrFxjpQoa_Na-hezCA3ckQG78gr9pUagH0IBHkRPKDOw9uw1qI8dH81261-A02Uzz4Bi3JNapzEbf5UoNQIaPE6jZtSitjzZLMP0XXoSaWa941OAPjAwQTCMchjsy2YCci_WSZP8SFcVbEsJo8Kbu2fs3tldUMCOAy2aMYxa5PUa1nZ2rVh6EY5Xnhj2JMIJSSo8gchxqPac8E1SQgrUiAjppMZluBy2fJ2AzKtXXd9B15mV9vumCN3rsCnmLnPEVTclIFgyvjK5nMmEN6ttjkIZDpErS-oOXdaEm9XaaVIcGMzdrAI95MnzuTA7Vr6l4p8IeFAspkhu0Ov6kqp-_6gTrTHrN0ECBdI7GRw470M4MekvhENL0pPt1A5W9cH6FjD23Z6lf7fA9QsgrD5jnWzROe-BW1BUC20QkcFjj85O5EIwniYA8PRlCs4adk8UEGUdMxWGZW7xUXm7oLsZ-6WrS_VvhFy5DrAE8fmE97uQxXe0tr-Hj0or9XiviUws7aarvfnfe7T6cNY8-o-bB0FrePfE5O_8zjqhGjNtTN7WcBfDZisq8RTNpXDc6rimwce6ZgwnqiBYP8cPNGXo9HsY-3driUdnhCLftv8XBAlnrLC7Kjyxg0A4FeF4cADA-ppJW3hPKzYmE4cuPGfdhHo3PxwUQXOCmCzCqL9_ztcwgnhm6JRQw4uKRCS0WqWtUn7HcGOkMz5F8e76JMnMgLjrd-dgu_A1dK6NmdAbsyi4CFf2k8ZDNIMijZ_flastXn8pv18nmur3-E9HlazGBPYjJ7Z7_hovpN4jdE3BFB_8YKSRVe2ouHT7Mb-E5BA45bLnASzm4xqrWIYXaz2S8UWG_5mx6_rMAn14lzgl3Wwg3Z6qfvjHYBsjRQvAlgb_0di_t90sJ9QfHq_iVBLLCq9PGmT25TukCJEsP0ukX2Fu9FX2PM1JV9RZU2aPGzCjSyTQfH3LoNRhU6Gh5tA_0oW-EWTq6EGb9gKrts15bB7hvTCy270syDc71rvpPmwtlD8dmTK6PWN8Z8NGvagEj-GnEcbBlRmEjiKiEmbpmLqVeeKiyGi24okU1lJf32i1zDDEfVwZruptAD2ACBlBsxfEmAfd99R46AiBrFWvui9yXk85HGjHe8hWJGSJw0d4gvt1LIagHeWf0dZLtnWQbZ8p9PsiYLtkGnEM2_5WOvlM13YB8F3KCUK8b_gVCUOjAfju-tgo6h8olWM5d2ESnsgTeGWLF_9uPqFPTtTg7-aTIuFIxcogkKi5fuIOJP2uABy6yvk9A03Qa9FI3NwXc-82vzSpW2MLL0WGVNx_pQWFzRsMjKv0-JM-aMZzpAzN2C4Uk9VCc3ZJGOpiZjQ-lBtnM8-YTjqVIe7iT3kBr3P54myXf9r6xbc0tig-wqMeeA73zYLBuEsLIB38y0603jY0inCm-hbVO9h2N3o4ViWAWA93Ga0mkwpj8W6Af1AjfIUALeIaZ4Cx5qr3oMZ8UsehElUkILI48P5G2efNPQIW-9aKw0XWmh0CO7ZZQi-JXSfcEed-ulz50mCneWpLjb1qv3J6hDu3v0k10KYOZuCopVSyVr5Amxss8ebEHaxZl94FYnCxzWWB-tq0PDFZ3IaonomQSgfYU0KItK1lZ8GkYcXtx-dacFmaZ_5kg5XGIuCG9qjpf7N1NhEM1g=","internal_chat_message_metadata_passthrough":{"turn_id":"26ffcdc1-acc4-4471-b1c2-0679cc034519"},"summary":[{"type":"summary_text","text":"**Communicating repair design**"}],"metadata":{"turn_id":"26ffcdc1-acc4-4471-b1c2-0679cc034519"}},{"id":"ctc_0a8f6f40d1e69e19016a9d5854540087d28e2f894c7f411138","type":"custom_tool_call","status":"completed","call_id":"call_BjD0WNSYRgES2nigpAREtjOa","input":"*** Begin Patch\n[C:/Users/decid/Documents/projects/spt-core/.worktrees/iolog-277/crates/spt-store/src/iolog.rs#F599]\nPUT >142:\n+\n+/// A poll's selected rows and the global prefix maximum from the same snapshot.\n+#[derive(Debug, Default)]\n+pub struct IoLogRead {\n+    pub rows: Vec<IoLogRow>,\n+    /// Independent of the cursor, output limit, and whether row JSON parses.\n+    pub head: u64,\n+}\nPUT 193.=197:\n+/// The highest seq in the complete rows of the tail window, or 0 if empty.\n+///\n+/// Healthy logs are increasing, so this is their head. Append integrity and\n+/// poll snapshots scan all prefixes instead: a damaged log's older maximum can\n+/// lie outside this window.\nPUT >198:\n+// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\nPUT 214.=231:\n+    let mut buf = Vec::new();\n+    if f.read_to_end(&mut buf).is_err() {\n+        return 0;\n+    }\n+    let complete = if start > 0 {\n+        // Drop the fragment BEFORE decoding: the seek can bisect a codepoint.\n+        match buf.iter().position(|&b| b == b'\\n') {\n+            Some(end) if end + 1 < buf.len() => &buf[end + 1..],\n+            _ => {\n+                // No complete row remains, including a window ending at the\n+                // only row's newline. Read whole rather than answer falsely 0.\n+                return std::fs::read(&path)\n+                    .ok()\n+                    .map(|bytes| {\n+                        String::from_utf8_lossy(&bytes)\n+                            .lines()\n+                            .filter_map(line_seq)\n+                            .max()\n+                            .unwrap_or(0)\n+                    })\n+                    .unwrap_or(0);\n+            }\n+        }\n+    } else {\n+        &buf[..]\n+    };\n+    String::from_utf8_lossy(complete)\n+        .lines()\n+        .filter_map(line_seq)\n+        .max()\n+        .unwrap_or(0)\nPUT 234.=247:\n+/// Read only the ASCII sequence prefix; payload bytes need not decode.\n+fn byte_line_seq(line: &[u8]) -> Option<u64> {\n+    let tab = line.iter().position(|&b| b == b'\\t')?;\n+    std::str::from_utf8(&line[..tab]).ok()?.trim().parse().ok()\n+}\n+\n+/// One full read supplies integrity, global maximum, retention count, and any\n+/// rewrite bytes. Healthy logs are bounded to 1250 rows (about 20MB at the\n+/// payload cap); legacy oversized logs pay their full scan until repaired.\n+/// Endpoints alone cannot prove integrity: 1, 2, 1, 3 has increasing endpoints.\n+// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+struct LogScan {\n+    body: Vec<u8>,\n+    rows: usize,\n+    head: u64,\n+    damaged: bool,\n+}\n+\n+impl LogScan {\n+    fn read(path: &Path) -> io::Result<Self> {\n+        let body = match std::fs::read(path) {\n+            Ok(body) => body,\n+            Err(e) if e.kind() == io::ErrorKind::NotFound => Vec::new(),\n+            Err(e) => return Err(e),\n+        };\n+        let mut rows = 0;\n+        let mut head = 0;\n+        let mut previous = None;\n+        let mut damaged = false;\n+        for line in body.split_inclusive(|&b| b == b'\\n') {\n+            rows += 1;\n+            if let Some(seq) = byte_line_seq(line) {\n+                damaged |= previous.is_some_and(|prev| seq <= prev);\n+                previous = Some(seq);\n+                head = head.max(seq);\n+            }\n+        }\n+        Ok(Self { body, rows, head, damaged })\n+    }\n+}\n+\n+fn next_seq(seq: u64) -> io::Result<u64> {\n+    seq.checked_add(1)\n+        .ok_or_else(|| io::Error::other(\"io-events sequence exhausted\"))\n+}\nPUT 269.=284:\n+// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n+fn append_locked(perch_path: &Path, row: &IoLogRow) -> io::Result<u64> {\n+    let path = io_log_file_at(perch_path);\n+    let mut scan = LogScan::read(&path)?;\n+    let mut repaired = None;\n+    if scan.damaged {\n+        // Repair only retained history, in file order, above EVERY old prefix.\n+        // Old cursors see this history once; normal positional retention bounds\n+        // that replay. Never deserialize/reserialize the JSON half.\n+        let keep = retained_rows(scan.rows);\n+        let mut body = Vec::with_capacity(scan.body.len());\n+        for line in scan.body.split_inclusive(|&b| b == b'\\n').skip(scan.rows - keep) {\n+            if byte_line_seq(line).is_some() {\n+                scan.head = next_seq(scan.head)?;\n+                let tab = line.iter().position(|&b| b == b'\\t').unwrap();\n+                write!(&mut body, \"{}\", scan.head)?;\n+                body.extend_from_slice(&line[tab..]);\n+            } else {\n+                // Corrupt unkeyed lines remain unreadable, but are not lost.\n+                body.extend_from_slice(line);\n+            }\n+        }\n+        scan.rows = keep;\n+        repaired = Some(body);\n+    }\n+    // Preflight the entire repair AND new row before mutating the file: neither\n+    // saturation nor a partially committed repair may consume the last cursor.\n+    let seq = next_seq(scan.head)?;\n+    let mut stamped = row.clone();\n+    stamped.seq = seq;\n+    let line = compose_line(&stamped).map_err(io::Error::other)?;\n+    if let Some(body) = repaired {\n+        crate::atomic::atomic_write_bytes(&path, &body)?;\n+        scan.body = body;\n+    }\n+    let mut f = std::fs::OpenOptions::new()\n+        .create(true)\n+        .append(true)\n+        .open(&path)?;\n+    // An externally damaged final line must not absorb the appended prefix.\n+    if !scan.body.is_empty() && !scan.body.ends_with(b\"\\n\") {\n+        f.write_all(b\"\\n\")?;\n+        scan.body.push(b'\\n');\n+    }\n+    f.write_all(line.as_bytes())?;\n+    drop(f);\n+    // Retention remains best-effort after the event is safely appended. Reuse\n+    // the scan bytes rather than reading the entire file again for a trim.\n+    scan.rows += 1;\n+    if retained_rows(scan.rows) < scan.rows {\n+        scan.body.extend_from_slice(line.as_bytes());\n+        let _ = trim_locked(perch_path, &scan.body, scan.rows);\n+    }\n+    Ok(seq)\n+}\nPUT 288.=309:\n+/// Count physical lines, not sequence distance; reset blocks need exactly the\n+/// same newest-N retention as healthy logs.\n+// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n+// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+fn retained_rows(rows: usize) -> usize {\n+    if rows as u64 > IO_LOG_MAX_ROWS + IO_LOG_TRIM_SLACK {\n+        IO_LOG_MAX_ROWS as usize\n+    } else {\n+        rows\n+    }\n+}\n+\n+// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n+// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+fn trim_locked(perch_path: &Path, body: &[u8], rows: usize) -> io::Result<()> {\n+    let drop = rows - retained_rows(rows);\n+    if drop == 0 {\n+        return Ok(());\n+    }\n+    let offset = body\n+        .split_inclusive(|&b| b == b'\\n')\n+        .take(drop)\n+        .map(<[u8]>::len)\n+        .sum::<usize>();\n+    crate::atomic::atomic_write_bytes(&io_log_file_at(perch_path), &body[offset..])\n+}\nPUT >318:\n+// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\nPUT 319.=319:\n+pub fn read_after_at(perch_path: &Path, after: u64, limit: Option<usize>) -> IoLogRead {\nPUT 329.=329:\n+    let body = std::fs::read(io_log_file_at(perch_path)).unwrap_or_default();\nPUT 333.=348:\n+    let mut out = IoLogRead::default();\n+    for line in body.split_inclusive(|&b| b == b'\\n') {\n+        // Keep scanning prefixes after the limit: head belongs to this entire\n+        // shared-lock snapshot, not the last delivered (or decodable) row.\n+        let Some(seq) = byte_line_seq(line) else { continue };\n+        out.head = out.head.max(seq);\n+        if seq <= after || limit.is_some_and(|n| out.rows.len() >= n) {\n+            continue;\n+        }\n+        if let Some(row) = parse_line(&String::from_utf8_lossy(line)) {\n+            out.rows.push(row);\n+        }\n+    }\n+    out\n*** End Patch\n","internal_chat_message_metadata_passthrough":{"create_time":1788696621.828651,"turn_id":"26ffcdc1-acc4-4471-b1c2-0679cc034519"},"name":"edit","metadata":{"turn_id":"26ffcdc1-acc4-4471-b1c2-0679cc034519"}}]},"duration":92863.35729999933,"ttft":4746.873199999332,"completedAt":1788696714131,"contextSnapshot":{"promptTokens":30986,"nonMessageTokens":16812,"compactionEpoch":0}}}
{"type":"message","id":"59f3d1cb","parentId":"69157bdd","timestamp":"2026-09-06T12:11:54.165Z","message":{"role":"toolResult","toolCallId":"call_BjD0WNSYRgES2nigpAREtjOa|ctc_0a8f6f40d1e69e19016a9d5854540087d28e2f894c7f411138","toolName":"edit","content":[{"type":"text","text":"[.worktrees/iolog-277/crates/spt-store/src/iolog.rs#9EFB]\n113:pub struct IoLogRow {\n\n142:}\n143:\n144:/// A poll's selected rows and the global prefix maximum from the same snapshot.\n145:#[derive(Debug, Default)]\n…\n150:}\n151:\n152:/// The log file for an already-resolved perch.\n153:// [impl->REQ-HAZARD-SINGLE-PATH-SOURCE]\n199:const TAIL_WINDOW: u64 = 256 * 1024;\n200:\n201:/// The highest seq in the complete rows of the tail window, or 0 if empty.\n202:///\n203:/// Healthy logs are increasing, so this is their head. Append integrity and\n204:/// poll snapshots scan all prefixes instead: a damaged log's older maximum can\n205:/// lie outside this window.\n206:// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n207:// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n208:pub fn last_seq_at(perch_path: &Path) -> u64 {\n209:    let path = io_log_file_at(perch_path);\n\n220:    if f.seek(SeekFrom::Start(start)).is_err() {\n221:        return 0;\n222:    }\n223:    let mut buf = Vec::new();\n224:    if f.read_to_end(&mut buf).is_err() {\n225:        return 0;\n226:    }\n227:    let complete = if start > 0 {\n228:        // Drop the fragment BEFORE decoding: the seek can bisect a codepoint.\n…\n246:    } else {\n247:        &buf[..]\n248:    };\n249:    String::from_utf8_lossy(complete)\n250:        .lines()\n251:        .filter_map(line_seq)\n252:        .max()\n253:        .unwrap_or(0)\n254:}\n255:\n256:/// Read only the ASCII sequence prefix; payload bytes need not decode.\n257:fn byte_line_seq(line: &[u8]) -> Option<u64> {\n…\n300:}\n301:\n302:/// Append one event, assigning it the next seq. Answers the seq assigned.\n303:///\n\n309:pub fn append_at(perch_path: &Path, row: &IoLogRow) -> io::Result<u64> {\n\n320:}\n321:\n322:// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n323:// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n324:fn append_locked(perch_path: &Path, row: &IoLogRow) -> io::Result<u64> {\n325:    let path = io_log_file_at(perch_path);\n326:    let mut scan = LogScan::read(&path)?;\n…\n349:    // saturation nor a partially committed repair may consume the last cursor.\n350:    let seq = next_seq(scan.head)?;\n351:    let mut stamped = row.clone();\n352:    stamped.seq = seq;\n353:    let line = compose_line(&stamped).map_err(io::Error::other)?;\n354:    if let Some(body) = repaired {\n355:        crate::atomic::atomic_write_bytes(&path, &body)?;\n356:        scan.body = body;\n357:    }\n358:    let mut f = std::fs::OpenOptions::new()\n359:        .create(true)\n360:        .append(true)\n361:        .open(&path)?;\n362:    // An externally damaged final line must not absorb the appended prefix.\n…\n365:        scan.body.push(b'\\n');\n366:    }\n367:    f.write_all(line.as_bytes())?;\n368:    drop(f);\n369:    // Retention remains best-effort after the event is safely appended. Reuse\n…\n374:        let _ = trim_locked(perch_path, &scan.body, scan.rows);\n375:    }\n376:    Ok(seq)\n377:}\n379:/// Drop the oldest rows when the log has run past its bound plus slack.\n380:///\n381:/// Count physical lines, not sequence distance; reset blocks need exactly the\n382:/// same newest-N retention as healthy logs.\n383:// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n384:// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n385:fn retained_rows(rows: usize) -> usize {\n…\n388:    } else {\n389:        rows\n390:    }\n391:}\n392:\n…\n396:    let drop = rows - retained_rows(rows);\n397:    if drop == 0 {\n398:        return Ok(());\n399:    }\n400:    let offset = body\n401:        .split_inclusive(|&b| b == b'\\n')\n…\n404:        .sum::<usize>();\n405:    crate::atomic::atomic_write_bytes(&io_log_file_at(perch_path), &body[offset..])\n406:}\n407:\n414:/// it would see a half-written log. Readers do not exclude each other.\n415:// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n416:// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n417:pub fn read_after_at(perch_path: &Path, after: u64, limit: Option<usize>) -> IoLogRead {\n418:    let lock = std::fs::OpenOptions::new()\n419:        .create(true)\n420:        .write(true)\n421:        .truncate(false)\n422:        .open(io_log_lock_at(perch_path))\n423:        .ok();\n424:    if let Some(l) = lock.as_ref() {\n425:        let _ = l.lock_shared();\n426:    }\n427:    let body = std::fs::read(io_log_file_at(perch_path)).unwrap_or_default();\n428:    if let Some(l) = lock.as_ref() {\n429:        let _ = FileExt::unlock(l);\n430:    }\n431:    let mut out = IoLogRead::default();\n432:    for line in body.split_inclusive(|&b| b == b'\\n') {\n…\n437:        if seq <= after || limit.is_some_and(|n| out.rows.len() >= n) {\n438:            continue;\n439:        }\n440:        if let Some(row) = parse_line(&String::from_utf8_lossy(line)) {\n441:            out.rows.push(row);\n442:        }\n443:    }\n444:    out\n445:}"}],"details":{"diff":" 113|pub struct IoLogRow {\n\n 142|}\n 143|\n+144|/// A poll's selected rows and the global prefix maximum from the same snapshot.\n+145|#[derive(Debug, Default)]\n+146|pub struct IoLogRead {\n+147|    pub rows: Vec<IoLogRow>,\n+148|    /// Independent of the cursor, output limit, and whether row JSON parses.\n+149|    pub head: u64,\n+150|}\n+151|\n 144|/// The log file for an already-resolved perch.\n 145|// [impl->REQ-HAZARD-SINGLE-PATH-SOURCE]\n 191|const TAIL_WINDOW: u64 = 256 * 1024;\n 192|\n-193|/// The highest seq the log holds, or 0 when it holds nothing.\n+201|/// The highest seq in the complete rows of the tail window, or 0 if empty.\n 194|///\n-195|/// **Read from the tail, not by counting**: this runs on every append, and a\n-196|/// whole-file read per append would make the log's cost quadratic in its own\n-197|/// length.\n+203|/// Healthy logs are increasing, so this is their head. Append integrity and\n+204|/// poll snapshots scan all prefixes instead: a damaged log's older maximum can\n+205|/// lie outside this window.\n 198|// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n+207|// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n 199|pub fn last_seq_at(perch_path: &Path) -> u64 {\n 200|    let path = io_log_file_at(perch_path);\n\n 211|    if f.seek(SeekFrom::Start(start)).is_err() {\n 212|        return 0;\n 213|    }\n-214|    let mut buf = String::new();\n-215|    if f.read_to_string(&mut buf).is_err() {\n+223|    let mut buf = Vec::new();\n+224|    if f.read_to_end(&mut buf).is_err() {\n 216|        return 0;\n 217|    }\n-218|    // A window that reached no line start at all fell short of even ONE row;\n-219|    // re-read whole rather than answer from a fragment.\n-220|    if start > 0 && !buf.contains('\\n') {\n-221|        return std::fs::read_to_string(&path)\n-222|            .ok()\n-223|            .and_then(|s| s.lines().rev().find_map(line_seq))\n-224|            .unwrap_or(0);\n-225|    }\n-226|    let mut lines: Vec<&str> = buf.lines().collect();\n-227|    if start > 0 && !lines.is_empty() {\n-228|        // The first line in a mid-file window is a fragment of an earlier row.\n-229|        lines.remove(0);\n-230|    }\n-231|    lines.iter().rev().find_map(|l| line_seq(l)).unwrap_or(0)\n-232|}\n-233|\n-234|/// The lowest seq the log holds, or 0 when it holds nothing. Read from the head,\n-235|/// for the same reason [`last_seq_at`] reads from the tail.\n-236|fn first_seq_at(perch_path: &Path) -> u64 {\n-237|    let Ok(mut f) = std::fs::File::open(io_log_file_at(perch_path)) else {\n-238|        return 0;\n+227|    let complete = if start > 0 {\n+228|        // Drop the fragment BEFORE decoding: the seek can bisect a codepoint.\n+229|        match buf.iter().position(|&b| b == b'\\n') {\n+230|            Some(end) if end + 1 < buf.len() => &buf[end + 1..],\n+231|            _ => {\n+232|                // No complete row remains, including a window ending at the\n+233|                // only row's newline. Read whole rather than answer falsely 0.\n+234|                return std::fs::read(&path)\n+235|                    .ok()\n+236|                    .map(|bytes| {\n+237|                        String::from_utf8_lossy(&bytes)\n+238|                            .lines()\n+239|                            .filter_map(line_seq)\n+240|                            .max()\n+241|                            .unwrap_or(0)\n+242|                    })\n+243|                    .unwrap_or(0);\n+244|            }\n+245|        }\n+246|    } else {\n+247|        &buf[..]\n 239|    };\n-240|    let mut buf = vec![0u8; TAIL_WINDOW as usize];\n-241|    let Ok(n) = f.read(&mut buf) else { return 0 };\n-242|    buf.truncate(n);\n-243|    String::from_utf8_lossy(&buf)\n+249|    String::from_utf8_lossy(complete)\n 244|        .lines()\n-245|        .find_map(line_seq)\n+251|        .filter_map(line_seq)\n+252|        .max()\n 246|        .unwrap_or(0)\n 247|}\n 248|\n+256|/// Read only the ASCII sequence prefix; payload bytes need not decode.\n+257|fn byte_line_seq(line: &[u8]) -> Option<u64> {\n+258|    let tab = line.iter().position(|&b| b == b'\\t')?;\n+259|    std::str::from_utf8(&line[..tab]).ok()?.trim().parse().ok()\n+260|}\n+261|\n+262|/// One full read supplies integrity, global maximum, retention count, and any\n+263|/// rewrite bytes. Healthy logs are bounded to 1250 rows (about 20MB at the\n+264|/// payload cap); legacy oversized logs pay their full scan until repaired.\n+265|/// Endpoints alone cannot prove integrity: 1, 2, 1, 3 has increasing endpoints.\n+266|// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+267|struct LogScan {\n+268|    body: Vec<u8>,\n+269|    rows: usize,\n+270|    head: u64,\n+271|    damaged: bool,\n+272|}\n+273|\n+274|impl LogScan {\n+275|    fn read(path: &Path) -> io::Result<Self> {\n+276|        let body = match std::fs::read(path) {\n+277|            Ok(body) => body,\n+278|            Err(e) if e.kind() == io::ErrorKind::NotFound => Vec::new(),\n+279|            Err(e) => return Err(e),\n+280|        };\n+281|        let mut rows = 0;\n+282|        let mut head = 0;\n+283|        let mut previous = None;\n+284|        let mut damaged = false;\n+285|        for line in body.split_inclusive(|&b| b == b'\\n') {\n+286|            rows += 1;\n+287|            if let Some(seq) = byte_line_seq(line) {\n+288|                damaged |= previous.is_some_and(|prev| seq <= prev);\n+289|                previous = Some(seq);\n+290|                head = head.max(seq);\n+291|            }\n+292|        }\n+293|        Ok(Self { body, rows, head, damaged })\n+294|    }\n+295|}\n+296|\n+297|fn next_seq(seq: u64) -> io::Result<u64> {\n+298|    seq.checked_add(1)\n+299|        .ok_or_else(|| io::Error::other(\"io-events sequence exhausted\"))\n+300|}\n+301|\n 249|/// Append one event, assigning it the next seq. Answers the seq assigned.\n 250|///\n\n 256|pub fn append_at(perch_path: &Path, row: &IoLogRow) -> io::Result<u64> {\n\n 267|}\n 268|\n+322|// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+323|// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n 269|fn append_locked(perch_path: &Path, row: &IoLogRow) -> io::Result<u64> {\n-270|    let seq = last_seq_at(perch_path).saturating_add(1);\n+325|    let path = io_log_file_at(perch_path);\n+326|    let mut scan = LogScan::read(&path)?;\n+327|    let mut repaired = None;\n+328|    if scan.damaged {\n+329|        // Repair only retained history, in file order, above EVERY old prefix.\n+330|        // Old cursors see this history once; normal positional retention bounds\n+331|        // that replay. Never deserialize/reserialize the JSON half.\n+332|        let keep = retained_rows(scan.rows);\n+333|        let mut body = Vec::with_capacity(scan.body.len());\n+334|        for line in scan.body.split_inclusive(|&b| b == b'\\n').skip(scan.rows - keep) {\n+335|            if byte_line_seq(line).is_some() {\n+336|                scan.head = next_seq(scan.head)?;\n+337|                let tab = line.iter().position(|&b| b == b'\\t').unwrap();\n+338|                write!(&mut body, \"{}\", scan.head)?;\n+339|                body.extend_from_slice(&line[tab..]);\n+340|            } else {\n+341|                // Corrupt unkeyed lines remain unreadable, but are not lost.\n+342|                body.extend_from_slice(line);\n+343|            }\n+344|        }\n+345|        scan.rows = keep;\n+346|        repaired = Some(body);\n+347|    }\n+348|    // Preflight the entire repair AND new row before mutating the file: neither\n+349|    // saturation nor a partially committed repair may consume the last cursor.\n+350|    let seq = next_seq(scan.head)?;\n 271|    let mut stamped = row.clone();\n 272|    stamped.seq = seq;\n 273|    let line = compose_line(&stamped).map_err(io::Error::other)?;\n+354|    if let Some(body) = repaired {\n+355|        crate::atomic::atomic_write_bytes(&path, &body)?;\n+356|        scan.body = body;\n+357|    }\n 274|    let mut f = std::fs::OpenOptions::new()\n 275|        .create(true)\n 276|        .append(true)\n-277|        .open(io_log_file_at(perch_path))?;\n+361|        .open(&path)?;\n+362|    // An externally damaged final line must not absorb the appended prefix.\n+363|    if !scan.body.is_empty() && !scan.body.ends_with(b\"\\n\") {\n+364|        f.write_all(b\"\\n\")?;\n+365|        scan.body.push(b'\\n');\n+366|    }\n 278|    f.write_all(line.as_bytes())?;\n-279|    // The trim is best-effort ON PURPOSE: a retention sweep that fails must not\n-280|    // cost the caller the event it just recorded. An over-long log is a disk\n-281|    // cost; a lost event is a hole in the record an adapter cannot detect.\n-282|    let _ = trim_locked(perch_path, seq);\n+368|    drop(f);\n+369|    // Retention remains best-effort after the event is safely appended. Reuse\n+370|    // the scan bytes rather than reading the entire file again for a trim.\n+371|    scan.rows += 1;\n+372|    if retained_rows(scan.rows) < scan.rows {\n+373|        scan.body.extend_from_slice(line.as_bytes());\n+374|        let _ = trim_locked(perch_path, &scan.body, scan.rows);\n+375|    }\n 283|    Ok(seq)\n 284|}\n 286|/// Drop the oldest rows when the log has run past its bound plus slack.\n 287|///\n-288|/// Seqs are contiguous — assigned +1 per append and trimmed only from the front\n-289|/// — so the row count is `last - first + 1` and needs no scan to compute.\n+381|/// Count physical lines, not sequence distance; reset blocks need exactly the\n+382|/// same newest-N retention as healthy logs.\n 290|// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n-291|fn trim_locked(perch_path: &Path, last: u64) -> io::Result<()> {\n-292|    let first = first_seq_at(perch_path);\n-293|    if first == 0 {\n-294|        return Ok(());\n+384|// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+385|fn retained_rows(rows: usize) -> usize {\n+386|    if rows as u64 > IO_LOG_MAX_ROWS + IO_LOG_TRIM_SLACK {\n+387|        IO_LOG_MAX_ROWS as usize\n+388|    } else {\n+389|        rows\n 295|    }\n-296|    let rows = last.saturating_sub(first).saturating_add(1);\n-297|    if rows <= IO_LOG_MAX_ROWS + IO_LOG_TRIM_SLACK {\n+391|}\n+392|\n+393|// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n+394|// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+395|fn trim_locked(perch_path: &Path, body: &[u8], rows: usize) -> io::Result<()> {\n+396|    let drop = rows - retained_rows(rows);\n+397|    if drop == 0 {\n 298|        return Ok(());\n 299|    }\n-300|    let keep_from = last.saturating_sub(IO_LOG_MAX_ROWS - 1);\n-301|    let path = io_log_file_at(perch_path);\n-302|    let body = std::fs::read_to_string(&path)?;\n-303|    let kept: String = body\n-304|        .lines()\n-305|        .filter(|l| line_seq(l).is_some_and(|s| s >= keep_from))\n-306|        .map(|l| format!(\"{l}\\n\"))\n-307|        .collect();\n-308|    crate::atomic::atomic_write_string(&path, &kept).map_err(io::Error::other)\n+400|    let offset = body\n+401|        .split_inclusive(|&b| b == b'\\n')\n+402|        .take(drop)\n+403|        .map(<[u8]>::len)\n+404|        .sum::<usize>();\n+405|    crate::atomic::atomic_write_bytes(&io_log_file_at(perch_path), &body[offset..])\n 309|}\n 310|\n 317|/// it would see a half-written log. Readers do not exclude each other.\n 318|// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n-319|pub fn read_after_at(perch_path: &Path, after: u64, limit: Option<usize>) -> Vec<IoLogRow> {\n+416|// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+417|pub fn read_after_at(perch_path: &Path, after: u64, limit: Option<usize>) -> IoLogRead {\n 320|    let lock = std::fs::OpenOptions::new()\n 321|        .create(true)\n 322|        .write(true)\n 323|        .truncate(false)\n 324|        .open(io_log_lock_at(perch_path))\n 325|        .ok();\n 326|    if let Some(l) = lock.as_ref() {\n 327|        let _ = l.lock_shared();\n 328|    }\n-329|    let body = std::fs::read_to_string(io_log_file_at(perch_path)).unwrap_or_default();\n+427|    let body = std::fs::read(io_log_file_at(perch_path)).unwrap_or_default();\n 330|    if let Some(l) = lock.as_ref() {\n 331|        let _ = FileExt::unlock(l);\n 332|    }\n-333|    let mut out: Vec<IoLogRow> = Vec::new();\n-334|    for line in body.lines() {\n-335|        // The cheap prefix test FIRST: an already-seen row costs an integer\n-336|        // parse, never a JSON one.\n-337|        match line_seq(line) {\n-338|            Some(s) if s > after => {}\n-339|            _ => continue,\n+431|    let mut out = IoLogRead::default();\n+432|    for line in body.split_inclusive(|&b| b == b'\\n') {\n+433|        // Keep scanning prefixes after the limit: head belongs to this entire\n+434|        // shared-lock snapshot, not the last delivered (or decodable) row.\n+435|        let Some(seq) = byte_line_seq(line) else { continue };\n+436|        out.head = out.head.max(seq);\n+437|        if seq <= after || limit.is_some_and(|n| out.rows.len() >= n) {\n+438|            continue;\n 340|        }\n-341|        if let Some(row) = parse_line(line) {\n-342|            out.push(row);\n+440|        if let Some(row) = parse_line(&String::from_utf8_lossy(line)) {\n+441|            out.rows.push(row);\n 343|        }\n-344|        if limit.is_some_and(|n| out.len() >= n) {\n-345|            break;\n-346|        }\n 347|    }\n 348|    out\n 349|}","firstChangedLine":142,"op":"update","path":"C:\\Users\\decid\\Documents\\projects\\spt-core\\.worktrees\\iolog-277\\crates\\spt-store\\src\\iolog.rs","snapshotsPruned":true},"isError":false,"timestamp":1788696714165}}
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{"type":"message","id":"2ed45304","parentId":"f62981aa","timestamp":"2026-09-06T12:12:25.497Z","message":{"role":"toolResult","toolCallId":"call_lGJQRjsVNqF2JdlOVDfIwz8R|fc_0a8f6f40d1e69e19016a9d58a504d487d2b4092b957edb2000","toolName":"grep","content":[{"type":"text","text":"[.worktrees/iolog-277/crates/spt-store/src/iolog.rs#69F1]\n 323:// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n*324:fn append_locked(perch_path: &Path, row: &IoLogRow) -> io::Result<u64> {\n 325:    let path = io_log_file_at(perch_path);\n 326:    let mut scan = LogScan::read(&path)?;\n 327:    let mut repaired = None;\n...\n 416:// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n*417:pub fn read_after_at(perch_path: &Path, after: u64, limit: Option<usize>) -> IoLogRead {\n 418:    let lock = std::fs::OpenOptions::new()\n 419:        .create(true)\n 420:        .write(true)\n...\n 471:    // `parse_line` answers `None` for every row a newer core wrote, and\n*472:    // `read_after_at` SKIPS a `None` row in silence: the poll would not refuse,\n 473:    // it would go quiet about real events. Unpinned, that edit looks like\n 474:    // hardening. Pinned, it reddens here.\n 475:    //\n...\n 509:\n*510:    fn tmp(name: &str) -> PathBuf {\n 511:        let p = std::env::temp_dir().join(format!(\"iolog-{}-{}\", std::process::id(), name));\n 512:        let _ = std::fs::remove_dir_all(&p);\n 513:        std::fs::create_dir_all(&p).unwrap();\n...\n 524:        assert_eq!(append_at(&d, &row(\"MSG_IN\", \"c\")).unwrap(), 3);\n*525:        let all = read_after_at(&d, 0, None).rows;\n 526:        assert_eq!(all.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![1, 2, 3]);\n 527:        assert_eq!(\n 528:            all.iter().map(|r| r.payload.as_str()).collect::<Vec<_>>(),\n...\n 544:        }\n*545:        let after2 = read_after_at(&d, 2, None).rows;\n 546:        assert_eq!(after2.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![3, 4]);\n 547:        assert!(\n*548:            read_after_at(&d, 4, None).is_empty(),\n 549:            \"a cursor at the head sees nothing\"\n 550:        );\n*551:        let capped = read_after_at(&d, 0, Some(2)).rows;\n 552:        assert_eq!(capped.len(), 2, \"limit bounds the answer\");\n 553:        assert_eq!(capped[0].seq, 1, \"and keeps the OLDEST new rows, so no row is skipped\");\n 554:    }\n...\n 564:        append_at(&d, &row(\"USER_INPUT\", \"next\")).unwrap();\n*565:        let all = read_after_at(&d, 0, None).rows;\n 566:        assert_eq!(all.len(), 2, \"the newlines did not mint extra rows\");\n 567:        assert_eq!(all[0].payload, body, \"and the body round-trips verbatim\");\n 568:        assert_eq!(all[1].seq, 2);\n...\n 580:        assert_eq!(assigned, 1);\n*581:        let back = read_after_at(&d, 0, None).rows;\n 582:        assert_eq!(back[0].seq, 1, \"the LINE key is the log's own cursor\");\n 583:        assert_eq!(\n 584:            back[0].digest_seq,\n...\n 616:        }\n*617:        let at_brim = read_after_at(&d, 0, None).rows;\n 618:        assert_eq!(\n 619:            at_brim.len() as u64,\n 620:            brim,\n...\n 628:        append_at(&d, &row(\"USER_INPUT\", &format!(\"p{total}\"))).unwrap();\n*629:        let all = read_after_at(&d, 0, None).rows;\n 630:        assert_eq!(\n 631:            all.len() as u64,\n 632:            IO_LOG_MAX_ROWS,\n...\n 642:        assert_eq!(\n*643:            read_after_at(&d, 1, None).len() as u64,\n 644:            IO_LOG_MAX_ROWS,\n 645:            \"a cursor into the DROPPED region still sees everything that survives\"\n 646:        );\n...\n 653:        assert!(\n*654:            (read_after_at(&d, 0, None).len() as u64) <= brim,\n 655:            \"the retention ceiling holds across the slack cycle\"\n 656:        );\n 657:    }\n...\n 671:        assert_eq!(seq, 3, \"the seq walk read the PREFIX, which was intact\");\n*672:        let rows = read_after_at(&d, 0, None).rows;\n 673:        assert_eq!(rows.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![1, 3]);\n 674:    }\n 675:}"}],"details":{"scopePath":".worktrees/iolog-277/crates/spt-store/src/iolog.rs","searchPath":"C:/Users/decid/Documents/projects/spt-core/.worktrees/iolog-277/crates/spt-store/src/iolog.rs","cwd":"C:\\Users\\decid\\Documents\\projects\\spt-core","matchCount":15,"fileCount":1,"files":[".worktrees/iolog-277/crates/spt-store/src/iolog.rs"],"fileMatches":[{"path":".worktrees/iolog-277/crates/spt-store/src/iolog.rs","count":15}],"truncated":false,"displayContent":" 323│// [impl->REQ-IO-EVENT-ADAPTER-LOG]\n*324│fn append_locked(perch_path: &Path, row: &IoLogRow) -> io::Result<u64> {\n 325│    let path = io_log_file_at(perch_path);\n 326│    let mut scan = LogScan::read(&path)?;\n 327│    let mut repaired = None;\n    │...\n 416│// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n*417│pub fn read_after_at(perch_path: &Path, after: u64, limit: Option<usize>) -> IoLogRead {\n 418│    let lock = std::fs::OpenOptions::new()\n 419│        .create(true)\n 420│        .write(true)\n    │...\n 471│    // `parse_line` answers `None` for every row a newer core wrote, and\n*472│    // `read_after_at` SKIPS a `None` row in silence: the poll would not refuse,\n 473│    // it would go quiet about real events. Unpinned, that edit looks like\n 474│    // hardening. Pinned, it reddens here.\n 475│    //\n    │...\n 509│\n*510│    fn tmp(name: &str) -> PathBuf {\n 511│        let p = std::env::temp_dir().join(format!(\"iolog-{}-{}\", std::process::id(), name));\n 512│        let _ = std::fs::remove_dir_all(&p);\n 513│        std::fs::create_dir_all(&p).unwrap();\n    │...\n 524│        assert_eq!(append_at(&d, &row(\"MSG_IN\", \"c\")).unwrap(), 3);\n*525│        let all = read_after_at(&d, 0, None).rows;\n 526│        assert_eq!(all.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![1, 2, 3]);\n 527│        assert_eq!(\n 528│            all.iter().map(|r| r.payload.as_str()).collect::<Vec<_>>(),\n    │...\n 544│        }\n*545│        let after2 = read_after_at(&d, 2, None).rows;\n 546│        assert_eq!(after2.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![3, 4]);\n 547│        assert!(\n*548│            read_after_at(&d, 4, None).is_empty(),\n 549│            \"a cursor at the head sees nothing\"\n 550│        );\n*551│        let capped = read_after_at(&d, 0, Some(2)).rows;\n 552│        assert_eq!(capped.len(), 2, \"limit bounds the answer\");\n 553│        assert_eq!(capped[0].seq, 1, \"and keeps the OLDEST new rows, so no row is skipped\");\n 554│    }\n    │...\n 564│        append_at(&d, &row(\"USER_INPUT\", \"next\")).unwrap();\n*565│        let all = read_after_at(&d, 0, None).rows;\n 566│        assert_eq!(all.len(), 2, \"the newlines did not mint extra rows\");\n 567│        assert_eq!(all[0].payload, body, \"and the body round-trips verbatim\");\n 568│        assert_eq!(all[1].seq, 2);\n    │...\n 580│        assert_eq!(assigned, 1);\n*581│        let back = read_after_at(&d, 0, None).rows;\n 582│        assert_eq!(back[0].seq, 1, \"the LINE key is the log's own cursor\");\n 583│        assert_eq!(\n 584│            back[0].digest_seq,\n    │...\n 616│        }\n*617│        let at_brim = read_after_at(&d, 0, None).rows;\n 618│        assert_eq!(\n 619│            at_brim.len() as u64,\n 620│            brim,\n    │...\n 628│        append_at(&d, &row(\"USER_INPUT\", &format!(\"p{total}\"))).unwrap();\n*629│        let all = read_after_at(&d, 0, None).rows;\n 630│        assert_eq!(\n 631│            all.len() as u64,\n 632│            IO_LOG_MAX_ROWS,\n    │...\n 642│        assert_eq!(\n*643│            read_after_at(&d, 1, None).len() as u64,\n 644│            IO_LOG_MAX_ROWS,\n 645│            \"a cursor into the DROPPED region still sees everything that survives\"\n 646│        );\n    │...\n 653│        assert!(\n*654│            (read_after_at(&d, 0, None).len() as u64) <= brim,\n 655│            \"the retention ceiling holds across the slack cycle\"\n 656│        );\n 657│    }\n    │...\n 671│        assert_eq!(seq, 3, \"the seq walk read the PREFIX, which was intact\");\n*672│        let rows = read_after_at(&d, 0, None).rows;\n 673│        assert_eq!(rows.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![1, 3]);\n 674│    }\n 675│}"},"isError":false,"timestamp":1788696745497}}
{"type":"custom","customType":"tool_execution_start","data":{"toolCallId":"call_85puxJdfLK2xdTshPAcSmSKS|ctc_0a8f6f40d1e69e19016a9d58db84b887d2b5a6aa5bb3d08c2c","toolName":"edit","startedAt":"2026-09-06T12:14:39.036Z"},"id":"5a082a07","parentId":"2ed45304","timestamp":"2026-09-06T12:14:39.036Z"}
{"type":"message","id":"ee2ffc0a","parentId":"5a082a07","timestamp":"2026-09-06T12:14:39.036Z","message":{"role":"assistant","content":[{"type":"thinking","thinking":"**Writing byte-preserving fixtures**\n\n**Building base fixture rows**"},{"type":"thinking","thinking":"**Checking sequence-filter behavior**\n\n**Building reset-sequence fixture**"},{"type":"toolCall","id":"call_85puxJdfLK2xdTshPAcSmSKS|ctc_0a8f6f40d1e69e19016a9d58db84b887d2b5a6aa5bb3d08c2c","name":"edit","arguments":{"input":"*** Begin Patch\n[C:/Users/decid/Documents/projects/spt-core/.worktrees/iolog-277/crates/spt-store/src/iolog.rs#69F1]\nPUT 548.=548:\n+            read_after_at(&d, 4, None).rows.is_empty(),\nPUT 643.=643:\n+            read_after_at(&d, 1, None).rows.len() as u64,\nPUT 654.=654:\n+            (read_after_at(&d, 0, None).rows.len() as u64) <= brim,\nPUT >514:\n+\n+    fn fixture(seqs: impl IntoIterator<Item = u64>) -> Vec<u8> {\n+        let mut body = Vec::new();\n+        for (position, seq) in seqs.into_iter().enumerate() {\n+            // Deliberately noncanonical JSON, including an unknown field and\n+            // escape spellings: repair must preserve bytes, not just meaning.\n+            writeln!(\n+                &mut body,\n+                \"{seq}\\t{{ \\\"payload\\\": \\\"p{}\\\\u4e16\\\", \\\"kind\\\": \\\"MSG_IN\\\", \\\"at_ms\\\": 1, \\\"future\\\": true }}\",\n+                position + 1\n+            )\n+            .unwrap();\n+        }\n+        body\n+    }\n+\n+    fn payload_bytes(body: &[u8]) -> Vec<&[u8]> {\n+        body.split_inclusive(|&b| b == b'\\n')\n+            .map(|line| &line[line.iter().position(|&b| b == b'\\t').unwrap() + 1..])\n+            .collect()\n+    }\n+\n+    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+    #[test]\n+    fn a_tail_window_inside_three_byte_utf8_never_resets_the_seq() {\n+        let d = tmp(\"utf8-window\");\n+        let mut body = Vec::new();\n+        let last = 32;\n+        let mut event = row(\"AGENT_OUTPUT\", &\"\\u{4e16}\".repeat(4_000));\n+        for seq in 1..=last {\n+            event.seq = seq;\n+            body.extend_from_slice(compose_line(&event).unwrap().as_bytes());\n+        }\n+        // Adjust only trailing JSON whitespace until the fixed window bisects\n+        // 世. Rows use literal LF on every OS; no text-mode CRLF translation.\n+        for _ in 0..3 {\n+            let start = body.len() - TAIL_WINDOW as usize;\n+            if (0x80..=0xbf).contains(&body[start]) {\n+                break;\n+            }\n+            body.insert(body.len() - 1, b' ');\n+        }\n+        let start = body.len() - TAIL_WINDOW as usize;\n+        assert!((0x80..=0xbf).contains(&body[start]), \"window begins at a continuation byte\");\n+        let lead = if body[start - 1] == 0xe4 { start - 1 } else { start - 2 };\n+        assert_eq!(&body[lead..lead + 3], \"\\u{4e16}\".as_bytes());\n+        std::fs::write(io_log_file_at(&d), body).unwrap();\n+        // Mutation-sensitive even though append's independent integrity scan\n+        // can mask last_seq_at regressing to read_to_string/InvalidData -> 0.\n+        assert_eq!(last_seq_at(&d), last);\n+        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"next\")).unwrap(), last + 1);\n+    }\n+\n+    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+    #[test]\n+    fn a_tail_without_a_complete_row_falls_back_to_the_whole_file() {\n+        for terminated in [false, true] {\n+            let d = tmp(if terminated { \"giant-lf\" } else { \"giant-no-lf\" });\n+            let mut event = row(\"AGENT_OUTPUT\", &\"x\".repeat(TAIL_WINDOW as usize + 100));\n+            event.seq = 87;\n+            let mut body = compose_line(&event).unwrap();\n+            if !terminated {\n+                body.pop();\n+            }\n+            std::fs::write(io_log_file_at(&d), body).unwrap();\n+            assert_eq!(last_seq_at(&d), 87, \"terminated={terminated}\");\n+        }\n+    }\n+\n+    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+    #[test]\n+    fn reset_blocks_repair_above_the_max_without_changing_payload_bytes() {\n+        let d = tmp(\"repair-blocks\");\n+        let body = fixture([201, 202, 203, 1, 2, 3]);\n+        std::fs::write(io_log_file_at(&d), &body).unwrap();\n+        assert_eq!(last_seq_at(&d), 203, \"tail maximum, not its last line\");\n+        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"new\")).unwrap(), 210);\n+        let repaired = std::fs::read(io_log_file_at(&d)).unwrap();\n+        assert_eq!(&payload_bytes(&repaired)[..6], payload_bytes(&body));\n+        let read = read_after_at(&d, 203, None);\n+        assert_eq!(read.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), (204..=210).collect::<Vec<_>>());\n+        assert_eq!(read.rows.last().unwrap().payload, \"new\");\n+        // The next append must not repair already-renumbered history again.\n+        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"later\")).unwrap(), 211);\n+        let later = std::fs::read(io_log_file_at(&d)).unwrap();\n+        assert!(later.starts_with(&repaired));\n+    }\n+\n+    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+    #[test]\n+    fn equal_adjacent_seqs_are_repaired() {\n+        let d = tmp(\"repair-equal\");\n+        std::fs::write(io_log_file_at(&d), fixture([1, 1])).unwrap();\n+        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"new\")).unwrap(), 4);\n+        let read = read_after_at(&d, 1, None);\n+        assert_eq!(read.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![2, 3, 4]);\n+    }\n+\n+    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+    #[test]\n+    fn an_internal_reset_is_repaired_even_when_last_exceeds_first() {\n+        let d = tmp(\"repair-internal\");\n+        std::fs::write(io_log_file_at(&d), fixture([1, 2, 1, 3])).unwrap();\n+        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"new\")).unwrap(), 8);\n+        let read = read_after_at(&d, 3, None);\n+        assert_eq!(read.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), (4..=8).collect::<Vec<_>>());\n+    }\n+\n+    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+    #[test]\n+    fn repair_uses_the_global_max_even_when_it_is_outside_the_tail() {\n+        let d = tmp(\"repair-global\");\n+        let mut body = fixture([9_000]);\n+        let first_len = body.len();\n+        let mut event = row(\"AGENT_OUTPUT\", &\"\\u{4e16}\".repeat(4_000));\n+        for seq in 1..=30 {\n+            event.seq = seq;\n+            body.extend_from_slice(compose_line(&event).unwrap().as_bytes());\n+        }\n+        assert!(body.len() - TAIL_WINDOW as usize > first_len);\n+        std::fs::write(io_log_file_at(&d), &body).unwrap();\n+        assert_eq!(last_seq_at(&d), 30, \"the older maximum is outside the window\");\n+        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"new\")).unwrap(), 9_032);\n+        let repaired = std::fs::read(io_log_file_at(&d)).unwrap();\n+        assert_eq!(&payload_bytes(&repaired)[..31], payload_bytes(&body));\n+        let read = read_after_at(&d, 9_000, None);\n+        assert_eq!(read.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), (9_001..=9_032).collect::<Vec<_>>());\n+    }\n+\n+    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+    #[test]\n+    fn trimming_1251_reset_rows_keeps_the_newest_1000_by_position() {\n+        let d = tmp(\"trim-reset-position\");\n+        let body = fixture((1..=250).chain(1..=1_000).chain([2_000]));\n+        let lines: Vec<_> = body.split_inclusive(|&b| b == b'\\n').collect();\n+        assert_eq!(lines.len(), 1_251);\n+        let expected = lines[251..].concat();\n+        // Negative control: last-N by seq value drops 999 newest rows here.\n+        let value_filtered = lines.iter()\n+            .filter(|line| byte_line_seq(line).is_some_and(|seq| seq >= 1_001))\n+            .copied()\n+            .collect::<Vec<_>>()\n+            .concat();\n+        assert_ne!(value_filtered, expected);\n+        std::fs::write(io_log_file_at(&d), &body).unwrap();\n+        trim_locked(&d, &body, lines.len()).unwrap();\n+        assert_eq!(std::fs::read(io_log_file_at(&d)).unwrap(), expected);\n+        let read = read_after_at(&d, 0, None);\n+        assert_eq!(read.rows.first().unwrap().payload, \"p252世\");\n+        assert_eq!(read.rows.last().unwrap().payload, \"p1251世\");\n+        assert_eq!(read.rows.len(), IO_LOG_MAX_ROWS as usize);\n+    }\n+\n+    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+    #[test]\n+    fn oversized_repair_retains_bounded_newest_history() {\n+        let d = tmp(\"repair-bounded\");\n+        let body = fixture((1..=1_200).chain(1..=100));\n+        std::fs::write(io_log_file_at(&d), &body).unwrap();\n+        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"new\")).unwrap(), 2_201);\n+        let repaired = std::fs::read(io_log_file_at(&d)).unwrap();\n+        assert_eq!(&payload_bytes(&repaired)[..1_000], &payload_bytes(&body)[300..]);\n+        let read = read_after_at(&d, 1_200, None);\n+        assert_eq!(read.rows.len(), 1_001);\n+        assert_eq!(read.rows.first().unwrap().seq, 1_201);\n+        assert_eq!(read.rows.last().unwrap().seq, 2_201);\n+    }\n+\n+    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+    #[test]\n+    fn sequence_exhaustion_refuses_without_modifying_history() {\n+        // Healthy exhaustion, repair exhaustion midway, and enough room for\n+        // repair but not its new row must ALL refuse before touching the file.\n+        for (name, seqs) in [\n+            (\"exhausted-healthy\", vec![u64::MAX]),\n+            (\"exhausted-repair\", vec![u64::MAX - 1, 1]),\n+            (\"exhausted-new-row\", vec![u64::MAX - 2, 1]),\n+        ] {\n+            let d = tmp(name);\n+            let body = fixture(seqs);\n+            std::fs::write(io_log_file_at(&d), &body).unwrap();\n+            assert!(append_at(&d, &row(\"USER_INPUT\", \"new\")).is_err());\n+            assert_eq!(std::fs::read(io_log_file_at(&d)).unwrap(), body);\n+        }\n+        let d = tmp(\"last-available-seq\");\n+        std::fs::write(io_log_file_at(&d), fixture([u64::MAX - 1])).unwrap();\n+        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"last\")).unwrap(), u64::MAX);\n+        let body = std::fs::read(io_log_file_at(&d)).unwrap();\n+        assert!(append_at(&d, &row(\"USER_INPUT\", \"overflow\")).is_err());\n+        assert_eq!(std::fs::read(io_log_file_at(&d)).unwrap(), body);\n+    }\n+\n+    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+    #[test]\n+    fn a_poll_reports_the_true_snapshot_head_independent_of_selected_rows() {\n+        let d = tmp(\"snapshot-head\");\n+        let mut body = fixture([201, 202, 1, 2]);\n+        body.extend_from_slice(b\"203\\tnot json\\n\");\n+        std::fs::write(io_log_file_at(&d), body).unwrap();\n+        let capped = read_after_at(&d, 0, Some(1));\n+        assert_eq!(capped.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![201]);\n+        assert_eq!(capped.head, 203, \"scan past the cap and corrupt JSON\");\n+        let uncapped = read_after_at(&d, 201, None);\n+        assert_eq!(uncapped.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![202]);\n+        assert_eq!(uncapped.head, 203);\n+        for (after, limit) in [(202, None), (203, None), (900, None), (0, Some(0))] {\n+            let read = read_after_at(&d, after, limit);\n+            assert!(read.rows.is_empty());\n+            assert_eq!(read.head, 203, \"after={after}, limit={limit:?}\");\n+        }\n+    }\n*** End Patch\n"},"customWireName":"edit"}],"api":"openai-codex-responses","provider":"openai-codex","model":"gpt-6-astra","usage":{"input":1405,"output":4356,"cacheRead":35712,"cacheWrite":0,"totalTokens":41473,"reasoningTokens":1034,"cost":{"input":0,"output":0,"cacheRead":0,"cacheWrite":0,"total":0}},"stopReason":"toolUse","timestamp":1788696745545,"responseId":"resp_0a8f6f40d1e69e19016a9d58a9cf6487d2881a38103c8a8142","providerPayload":{"type":"openaiResponsesHistory","provider":"openai-codex","dt":true,"items":[{"id":"rs_0a8f6f40d1e69e19016a9d58ac59fc87d2a7fc533912404684","type":"reasoning","content":[],"encrypted_content":"gAAAAABqnVjEvmDC1XG5_RzahZ_cf7uVp4FVuTlW15VCzbPyoWuyqp0zCv8XuGbmG8XQlELm5qurN0lnMQWY9Cj_ZLkJO1OF9JUubrqZeVKBJm3rSz3QmpBLJYp1QSCu1r7-ZCLwYJ_UcNV9QgxrvzeCpocmFDeHo3aBbXOpvh497c7y6FURRNY32XHW59aS6KQT5B78GsRo6sCG28daqW3mEHZBj-Ew4Kf3rusw-dA0AvCSUh_Zr0aLPeFRiqWOo_IXfa22DF9IKC0eBfm6xyjX_WA58-y0bWSwnbLbpjp4q2ejguG6tSFG5ebYghV9GZGx36Qs4VbZbWcDeF9n6D1TEaN49PT1jTQqPiZSxktzXuDo3ci9vOZebjCtmayW3DPybAX6FTTQgA3s3c4HDQKS-55mqK1CiOy5IfYgeLFgxTqqIuYN424WhMUHM_u7w6KjVkm31UAv8bvy7APw3AzovoHrSxLzJYhwethLegks1vob9XUzl1sA9rNBbBIKhcdgIM1F8OUIEu-Xk2DClBA0vnxFQ7OrgyYSA8Jd6xYuZWLSj_kL4wT3y4DmXGYvu7nNyFww5Q3l3keU17UP5xspOwL9xptd7f6YdZgA_vW685oFTU_4FU5WuA3-OxRA5uepDFyVt2LnOodB0T9G4IK-vp1s3GNx-1QetYNsTNyl32EqtEnWYB2saus_yxFuMf3iqlCxtqaN7J9Jl6-jepE3eGQpXyzZnkdwiN_O-XdxuTaxC_APMnUH7nYazOLTYDkcAiBhPBvvilSFhDmYjXUBnBl1WbaXBuORfQUDaKZ3ieQBpLUp4Ouq4SVOICxXJmYjBxWmJkObug6l7zh3v7ZNJd83XaoWXoGTb0x3EazNGIPG4t4_Q1BzNdZ2SziYnv3SphzRuYaCLDA_PcrADt4fTNBtTUe6x1koK_WIdU6c5773fiRBaEQAzidg144DEpL3v_ZOqsT4FOJ-f7LhWWfOCSJd9rOFi9oVZ-ypdHVJ6lRmWA4OftQuIsWIhigrQYfElfm0I8w-5GEiovOE3xwzRJVUIjK25wdQ5JWqqaEFdX41-5SzSoqvnG_lEFJ_b8ZdO8drmWUoGPp7ilXGoh6ly4FvGtYnWknylWBnxaiIYyGT_kTf78Ew2LfEUN-mRLpDiW9KnAvnx1zSmjCDf_oVGZ1DjJ4Dj-CCK3QA2cCvzr3S-R9BWjTiDHbNrXa7-JQ1HV4YpX7ERTMI__aMSWnkS9kQaVZTrRkFeErK1Q_t2GJCoRJbpWLDcvuMUrd4ndwBuES1Q-IGFrz0DDFLgj0DClZ3aGuLwi7fi88Mqr6hbHufFX8Ls4ikEC9muwqjIgMQxZyaONV_rPXlZwR0XgQ9FgMhmsKWlO_31wJNMuupuIqoqnIbeonl8bkJYoAEINEzSF0FIxy9EoksbDRfSJ4XhmxvZ4aZlQYrCpmDlVpzzGmv6JAsJy-aozFkrKexKFKFXHnBM2dDujk3NQqdvtAUeh3DwFicTtaulTAiRA0crdAw4eirLDAvNe2Jc9N7dX1ZU6USBbYy7RKha1lLa4uxnhezPHWduiNV6P-LPS8VuGNPhvAjBDBaeErJTOeS5AAchQqALXrqhFrSJkXdDXVQM-9tyAel1ekivyxm3Jxlil26elNuybLDyPzUoOIv-6-7X2JFPpMOPbwN7MR0gJOA_ybTfG5bSn2eeBERgDw-lMiuCOM4cW_WyE2NgiiUS2-8oiQml66vu_YtEErg8EUV5cuRPXfOdQH4amc4_7Fovzl89fkZlfVE6-rMB_xsPLJdS04gbpuPjJYSOEf455K35hqUdUoXEW1w_5bZhZbhwtymWKTRv05OwAOYhU88IMP4UMWAQEX2YK5EkVbm5faDrNpif6wGAP8jy0CqAlhQC6KlgaaEsVtP00rISxCql7U9ooZ45VcTZA8p7NNzJM5a-ZJsmJ7f-2tr-GTejbOPqkmtYvjNEa62LUPDTuN91RJ6Kpgc9OiNXi-hkPB--31LTP9coPhlf4qOVp98MhTE9_Q38tX4rZYD_OaslzpCdHTIDjQRJxB1ySkv0OX_iz4kR1w0AndlLklo3uVjdo2hcyFTo5nz4KOMzK2n0JUwlcwTpczcZ2xVGp4wNFKnbAcJIUTlm1SOxBZLzlAZ0GvWUH2A4h1p4QF8FOhJuRrpctsml2z8aOE37phTOL_n2cQUsZ1WjRCwTD2MaJJoJgqDk5szf8UbpzUM5JZaKwF2UL-pE_a8anF80-tIZSqF-3pr1YDL0yNFUNXwx0zq5Y1e1Kwt5gP97rnjxVGl2G27xTrn1lVzTZqtDCQKN1gycorQTHOy8_WJTZb5wzlC5NYhy0NomJTW3iMts_9h2Sp9Ppl811HJftsCqgLQK_2OKdJMUEFtnjR3v9NsGGf4rUCF8CN8ThiSA4bub0d4OyfPo8_fUYmQd8Ge0r4pXmno3xPKU4E0PrH4nYzvZLDqbyCiD3S84dplXw5HqBBkDSbay4KlN7JkHitNar9To5JtM63WFPTxlErXp7UK-6g9BuUcqJ4XfO4ECJlPX4LY45QuTvwLEGrWV7pRFBUrMLVy4m8S0x84BTNOQMS9apjvnSHUmmXU2T-8-llqkCoQ52SBgjkTgAo6j80fKwlzW1eTs40AKbuwrk3fiZ8wHh8Wcy64LjGvMk_2fv5ro5AuWnxKKNV0kZGGJ9khIRX7-V_ZkLBcGe9Ji8rayyzgYRRboDLPLjw1l4DJ8ClbrGnY8q6X3Qu8tgEP4Hp3GasD2Bw0Tps6RwvgDYt7tAtlcyEY4jXPTQoYl3oAX6vgRmOBmcE72ESEM5fRaXqkSWgcnChUGduIm9N5CbTq7tXrEbVRBQGrMqaFfGhI8ogmu1QgQg4pSdrRfbLj5oxpCHFCn3zgKQJakPUby4m0f4xD2XgRA5QLRieW3PLZ_lPtwUKGCAMSS_mi6XIFwPID1vwN_yPDwqOzzvuc50C9Vj9tMHyBDnK5s6U30ZWh4yj5pH6NiKYdHcjxL1DYmHVPMt7HDoNpMLe_fbcRuxk4r6v3a8GQnOf6s6MBUnVri6K1RoXNLWQHfim5pqtGSU9NGHqICq-QvqA6r8ryqTik4w4HC7OyGFEOU5B1z0p9skRI5MWxj2h48L9jJTgGYjNGIGDTvH8cyUEh0Thpa_PG-WKO66Bv2JOmQIddMjLEExEr5okH6-GVdoEJYPRsEC6kuW5c7HpsUDb3bS6qrLXoEo9fPYSmxLX2YATDrcrYt4AKLFW-4AkTAb_W51DD1F7XrRiLC8y0hvyb4ZtIXa93fL4IjQihlJHg0ZXFRenq77qVVaC53RDuPvQJUFlhWErlB55sk5oaW-Uwg8kgzPEAX8UHfWHSgHV4Kq1_SpMnzwFtnLJnCcopuriY8swHMLv42tWeMms2LcNx_gtKjJ29NIz75BVXL7tkI0ePGIB3Xi7-LPlyvLFSMJl2yimk3cKg3h41HP96Nn7QLKv8WoGpIxqyFX1KPesTpIDVCjhlMBrWnG3D9Kp6wRRbm3z_9dfQTd77OQF3n4d1N6a0DMIsgZW6BXohD_afSRpIDy0NLDOKQmqw_0a_v6TOl_id7uvbQfmc6RC2aaorQ6wEr4J30pENB-3xnYHbH9jT8-2_0phnphvA7HEwIjlzr1d1_KneTjhOIuXElUcNN5MEkXWgvGT9wTmDF_PvgmXERJBroeYFx8WvHTVhVPO56svmUeND29CYq98jLfvOFWlVmnjXoSybnX0S_VzqwHt3kEv9HWAcuM73DEQidkUkkWmFPxsZy21I4QAlwbcNCkK5iYzkiSbaoskRrDnhkOd0j6R1JyawwINs8L36GifJrMgSFNSyZv3y7woudAXHqtHtFcsfo-7GVaE_0IbNv0k4WJXmP8GqX_owN_lFoAUe3m7IjSRDcQUMFPpiRQ9hPvqahhzGoYQPHfzqJ5b-8YgDKaZfLlh6fgBu5KoOKFvBYid_fx4HLlxXGWWiL88em6_CeT5k3hVxFn8IFcmPRw1745cnHr5P7pbZK9JO5yaFLZfaXQhn9KN9crpd0598ksFlyJzHv-RIoGLdeIwPe2MvMQsn50z8WYrNVq1PYkNE_hTkzc-J9qQ03bDMUULf2y47PG-M-Sewc10waabbmnHRkokru5XqFwMv5krD1fSIEe2M0rXQV3W8voxpo1li60vx1LaZELEsuOmtMPxjMs4d1sXE4UG42lMKj2ZanQLV-IqjoW1QVBYkTIjDHj8rV6FGW_A23bg3iQGOvc_0HdnH4sDTz4Y0C8nvonsjTt3FjQWvskggZhPf93cPcDz4mOeB4RTLiFlMF6zfT00brpP4tTzkwBK0WJxvi6mqT139z-uVume4T0S-53E6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byte-preserving fixtures**"},{"type":"summary_text","text":"**Building base fixture rows**"}],"metadata":{"turn_id":"05ad431a-fba1-4c41-bd99-af1b9e26853e"}},{"id":"rs_0a8f6f40d1e69e19016a9d58c4fe6887d2bd4b80f565d0f475","type":"reasoning","content":[],"encrypted_content":"gAAAAABqnVjbNxy6XB4nr9NvB9IQY3AT8vZzsOM7wmoaeGtMJpBvErGZgCDxelX4xDrK5Z1sNbWH1Z2Oh9G9OSaSAq5MsNzcmL-sBKZGUYjKcw4si2dt8w0BOT6CR1Y2lzYZRG468CdXon1ERnsWXXzfs-9gbfkJHx18YAUhmE6Kb8hrcY9ru6DmJgq-7e-BLWInAE6S3S_OXr7W1tIq0tMnjy0xZKcgbRw4Ci8_17WZUs_p1xxaK8XTJzmYocbcqlZXmtYR3DmIUdu5r5tRxZWaG7jPy_zxyR1_FNg-EZoJLUO0eOlzVRn36ci6yIzf571fGWfTXhsuwbeiXjTHAxdv1nUy6JdjlqhI1bAZ0NSviBdggMYZq_1Dym18jVuc_r5_nAzk_i5iXiuU4OuIeH53z9Pm0Iwuse67wAQrMrN3NDO5LXKoP4fZGWKxX-moonz0mlY1ed1JN-RyowV0neLOR1PYvxSWzBP-4sd4sgSHvhqaK2lNATH6MgPosNysoMdnBLCj-pKkiD-jCWyRwUww3T7p7cerK8vEspjOBVAxuhL6MbCGROYBQXq8lcVpWDRWODF3CuDCF05gdr_ac2h5i0tPREPlAGW5j2l__-agnt1OEtRX-86q11WO5cFwfm6KtU444oYn0vUnEwtpcqu6-7XHYsEQX53PbyEHjAy1mrTe_sCXFTxak4zTv0qCoeZrPK0o0bs-Nc6vDknu9U1KqOoXg3buLOrjBQ93apO-CKOqGx-iyU78YKDquws6mUGic8XlPGmvsVEdfGmoQ24TwZHTeBbOZqZ7GQ6S6PNt2mBr_dpana4_6kL5XKs9AHMe9T3B5M3ak5t71sV9UyQCYRgzGkiATUkk7AAhhgaRO0lvik1WhOiGCnHa44X1KaO-gub6eWJoA4NObcpqzab6qVkBuUESreYqt2Dj7mfCahhKQQrFFZZjGHp_fTeAFznu1bnosKINMJCQDUgmVn12HHo3_R15r_5c3F7TxmAwLmlz0X3vh47qk3M5k6tlKNJCZ2vJ_qqyHaM-xWi4iN7JV_j6Fcdn9UgIWCLmU_TMU0kFpO85Zw60qVXdpz6cb_g7uYIhKdZxsLnKgyrqG3stWjeww0f6kHB4LkPcPcIcsLQU43dva0HCh2b0U2_HU7bNxi9o_kvGX4o1lvcCq204fibaaHxznArvPDZ2Q0NLVJxmMPpob4Yp7jQgFxkDONzUNZnOuK2q-2PBQO4x5DvdG0TZeP0C1KmTwD69KpfHknmYIdvhSJNdxOD8W9kyIgi6OPeOyQCmouJ80IDd6Y3BM-0f2oENdUB3lUHEP26sJ4mFWhVz_r9R_RRDj9A0UYDXRjePMkOVU_a4d39vKP96Occ3U2rzWEOl-A79rqTYf63Go_Z_JG-y8d9UvDKaOH43nF26zRRh1O3JEmC8Je9j5Taoc6aO1v8hB9n6hf384mCqFVJpWjo6sg2Z_0JiLyULzmffU-u55DmHscsCE3OGKiTN_UsWztDFpXI0kqcWmw0xEjaDPtAbzETYjzIjn1TnL0WwxktNyiSdJwowC5QCq0KWhDJBD0kbnioX24GR8gC4fvl07MFsSwnqSOrzkFVHHtAFPZr0obUnQz-1Qhr3j26VKCXfQmP05gtQ8cgZj7YGTCFk-4gPlgd5F-nEIj9PMdOq818njXlsiJRQELEJ1MUSqjyoiD3IdQDBxcla5-vlOTP7Xjy57IoOHxbNRf-Nr37hEGD2ZETYB7GtatGc2k0HPoqy8_AOaXo6qxqB85GTowPqPa009qiWp5m8-dC9yrKabMoWJQ1IHXxoOlEGF1igwdeIR0FrmW9uQrw8tpj10VbQ8MWQpdqWtjHu8JA7bFNlYDv7iu1oKqjkE5r_KqRzIl2NVOhgEGauYLv1QgF_ilHXgP9h-iPmI-PCiIpyEisEwyNVQkHFrhS1Sqp1Qx5Y-pKTLoP19NtDDgL0bUC-3UxgfEmA5654n4wLAyBmasmeKNGqyqpD9fKIGCsnScaMD0As8UHNQoMG7yXxYdrF_5xSkrbwyU9F9-OvLGFKmR8J0IEtnvb_wjc4a9bSitVNlGKN9art6orW9aQaSjBZebS2as6zrqkrWevvdq81pC7YtKXKlqYNt-DOwRGFbpXV8ItxWwWYkPv3sUxqNBmQQJ6Q3nkQLNOoKUSvv0G9-Cijj20ZZLhTKJekOp7AIti-Jllvlcd7EK6G_5g36VTPFbwUdOZy3w0CfHCeeKucXawePigwf1uhPxvuULVNCmMc9ufwtFuDxsculxory_L6rdDjUoAf72o9j3ATSLczId_G-oK2EBa8lCvktsO9rGSo88InyvzbaR8qtcM06dUmEV3bj_YE40PoZNoHInbqMoYNrLCmqaj3bScjEfhZEm1l54nj51-_7JaFK6seHeOyM2NRtYOfltfkAlFICeDo9M-Jx_7-_ZSM_YdQVIZk16Sdvn8WKfspoqFVU0dGeudNLPovys0GpH1NyLNfVeonqoeydFMJtUt0dsBTKfktMvSyf-MUE1MzIWAHLrYHQoOB2PP3QdLrMQx1iTsqZjebk0xgA0e3OdI90FNilWsN2_GYmshyU-UnNy2P9cTpB8KTsNhpIXXmu6qkhBpbC9nmjAVyPQINuHUFklueWc4tx7179RDIQCuWEse4tizBeKLrOh8d_drpKKlekqVQ2TPEHpDm_3tWZEikcU3zQ9VKAuKznDi20Z-uZ1-PdInPI1UCq5QXITLVizRgyzYCbaWwqLoK1htUjiX90zpur5pndcP3QN3iwTLAXhj5tQYzd54gW9dG1D2lmWdC55AWyuFcVrSakHQ4Ikgow_0VpoLnuuYenINActomQ-bH4V82kvBCcKnG4MnuYRdogd9ipWgykkQnjH9UHegrcH5_Tz1RIPnspaVSLs_ldKiIqsKKSoF0o6vtYr9kcyzt775yMp_bX2k-eUI5fGNrR-XpdtJ27XONXjeKkVTmQ7rLayksz2KLskIJft5k0b9arvX4isHj3wk7hDXZt7bwJDwrMmDRhHSecyc1i6crK1oiWqSkiG-yFxUIshL44PJczRDyBX2pJHw87SukRv55vZroNogSZO52hF_jFDxtG_CQIS2ZjSExzYGBVIScoVrzv1FumO3ZvZO-9jf3V0lXwFMtwTt2NqyjjQL1xfdqvizpBrWyPos5315qKDHC9yTN8Fm0RA-1BHgILZC9jUpfOZiyRIoIhQ0iBehwS55pnuGkKFKsPIr0XtU231up-ZYN8uGS7keKD17a4ZxUR67_PMPRBN2XjVyNk2Lg2Vl4uIYPENIHXz5Uz-Junp2Rh06PuG0Ysvk16zy0IPwi_zv0Tp0G4qPNYfenj8ycynT8JvHyQWdBNwz-nFEjdUQM04wHZnQBIafXPftjzKqH57GtJrKebSPtctrYDeqwlx_fQTEN6JDzc_yZk-5O-eVhLexsRE2sjbHWI6f43S9sHPm6QJZHL7ObBgi8X0B55AX3PPNSahS76MNaNlvap1pxz1xkYmFV5wLx7loHc0Cjnw2l4QhVHLF9JsGYj-5WuwRSwBaFP-V3X9MnYEuxG7QcxCEDPR2f1Bcj8dEHkITJigYAA-gp7GaZh7NTgTCZVGM2ATtcoYxpc_8vHt6RI-FMbvDriKTdtIP0RlV8D-eP7G8XTvox5ulaJJolYUwsFI897VStIG9wxgD3Fg7k-n10QiiVSAwZ_eFmXXRza60tcum54t33AcHj3oQhCn6tVKv5oIFOq3dBrZ3LirvI6QNm9y5KF9L8Dxm7AEaz5v8juJAoiY_3FhGK5gVZcuUaCYMuKTtRfnKMnwJ8rc3FiFTIv-yFAUHbHVI-PZFwCSBVJzWmBl59ZX2-NvOXcHUC1RfShmFXHengtSqjdH4SvYZFuZR_Yks9fiNWj-MVgoyZ","internal_chat_message_metadata_passthrough":{"turn_id":"05ad431a-fba1-4c41-bd99-af1b9e26853e"},"summary":[{"type":"summary_text","text":"**Checking sequence-filter behavior**"},{"type":"summary_text","text":"**Building reset-sequence fixture**"}],"metadata":{"turn_id":"05ad431a-fba1-4c41-bd99-af1b9e26853e"}},{"id":"ctc_0a8f6f40d1e69e19016a9d58db84b887d2b5a6aa5bb3d08c2c","type":"custom_tool_call","status":"completed","call_id":"call_85puxJdfLK2xdTshPAcSmSKS","input":"*** Begin Patch\n[C:/Users/decid/Documents/projects/spt-core/.worktrees/iolog-277/crates/spt-store/src/iolog.rs#69F1]\nPUT 548.=548:\n+            read_after_at(&d, 4, None).rows.is_empty(),\nPUT 643.=643:\n+            read_after_at(&d, 1, None).rows.len() as u64,\nPUT 654.=654:\n+            (read_after_at(&d, 0, None).rows.len() as u64) <= brim,\nPUT >514:\n+\n+    fn fixture(seqs: impl IntoIterator<Item = u64>) -> Vec<u8> {\n+        let mut body = Vec::new();\n+        for (position, seq) in seqs.into_iter().enumerate() {\n+            // Deliberately noncanonical JSON, including an unknown field and\n+            // escape spellings: repair must preserve bytes, not just meaning.\n+            writeln!(\n+                &mut body,\n+                \"{seq}\\t{{ \\\"payload\\\": \\\"p{}\\\\u4e16\\\", \\\"kind\\\": \\\"MSG_IN\\\", \\\"at_ms\\\": 1, \\\"future\\\": true }}\",\n+                position + 1\n+            )\n+            .unwrap();\n+        }\n+        body\n+    }\n+\n+    fn payload_bytes(body: &[u8]) -> Vec<&[u8]> {\n+        body.split_inclusive(|&b| b == b'\\n')\n+            .map(|line| &line[line.iter().position(|&b| b == b'\\t').unwrap() + 1..])\n+            .collect()\n+    }\n+\n+    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+    #[test]\n+    fn a_tail_window_inside_three_byte_utf8_never_resets_the_seq() {\n+        let d = tmp(\"utf8-window\");\n+        let mut body = Vec::new();\n+        let last = 32;\n+        let mut event = row(\"AGENT_OUTPUT\", &\"\\u{4e16}\".repeat(4_000));\n+        for seq in 1..=last {\n+            event.seq = seq;\n+            body.extend_from_slice(compose_line(&event).unwrap().as_bytes());\n+        }\n+        // Adjust only trailing JSON whitespace until the fixed window bisects\n+        // 世. Rows use literal LF on every OS; no text-mode CRLF translation.\n+        for _ in 0..3 {\n+            let start = body.len() - TAIL_WINDOW as usize;\n+            if (0x80..=0xbf).contains(&body[start]) {\n+                break;\n+            }\n+            body.insert(body.len() - 1, b' ');\n+        }\n+        let start = body.len() - TAIL_WINDOW as usize;\n+        assert!((0x80..=0xbf).contains(&body[start]), \"window begins at a continuation byte\");\n+        let lead = if body[start - 1] == 0xe4 { start - 1 } else { start - 2 };\n+        assert_eq!(&body[lead..lead + 3], \"\\u{4e16}\".as_bytes());\n+        std::fs::write(io_log_file_at(&d), body).unwrap();\n+        // Mutation-sensitive even though append's independent integrity scan\n+        // can mask last_seq_at regressing to read_to_string/InvalidData -> 0.\n+        assert_eq!(last_seq_at(&d), last);\n+        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"next\")).unwrap(), last + 1);\n+    }\n+\n+    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+    #[test]\n+    fn a_tail_without_a_complete_row_falls_back_to_the_whole_file() {\n+        for terminated in [false, true] {\n+            let d = tmp(if terminated { \"giant-lf\" } else { \"giant-no-lf\" });\n+            let mut event = row(\"AGENT_OUTPUT\", &\"x\".repeat(TAIL_WINDOW as usize + 100));\n+            event.seq = 87;\n+            let mut body = compose_line(&event).unwrap();\n+            if !terminated {\n+                body.pop();\n+            }\n+            std::fs::write(io_log_file_at(&d), body).unwrap();\n+            assert_eq!(last_seq_at(&d), 87, \"terminated={terminated}\");\n+        }\n+    }\n+\n+    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+    #[test]\n+    fn reset_blocks_repair_above_the_max_without_changing_payload_bytes() {\n+        let d = tmp(\"repair-blocks\");\n+        let body = fixture([201, 202, 203, 1, 2, 3]);\n+        std::fs::write(io_log_file_at(&d), &body).unwrap();\n+        assert_eq!(last_seq_at(&d), 203, \"tail maximum, not its last line\");\n+        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"new\")).unwrap(), 210);\n+        let repaired = std::fs::read(io_log_file_at(&d)).unwrap();\n+        assert_eq!(&payload_bytes(&repaired)[..6], payload_bytes(&body));\n+        let read = read_after_at(&d, 203, None);\n+        assert_eq!(read.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), (204..=210).collect::<Vec<_>>());\n+        assert_eq!(read.rows.last().unwrap().payload, \"new\");\n+        // The next append must not repair already-renumbered history again.\n+        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"later\")).unwrap(), 211);\n+        let later = std::fs::read(io_log_file_at(&d)).unwrap();\n+        assert!(later.starts_with(&repaired));\n+    }\n+\n+    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+    #[test]\n+    fn equal_adjacent_seqs_are_repaired() {\n+        let d = tmp(\"repair-equal\");\n+        std::fs::write(io_log_file_at(&d), fixture([1, 1])).unwrap();\n+        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"new\")).unwrap(), 4);\n+        let read = read_after_at(&d, 1, None);\n+        assert_eq!(read.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![2, 3, 4]);\n+    }\n+\n+    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+    #[test]\n+    fn an_internal_reset_is_repaired_even_when_last_exceeds_first() {\n+        let d = tmp(\"repair-internal\");\n+        std::fs::write(io_log_file_at(&d), fixture([1, 2, 1, 3])).unwrap();\n+        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"new\")).unwrap(), 8);\n+        let read = read_after_at(&d, 3, None);\n+        assert_eq!(read.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), (4..=8).collect::<Vec<_>>());\n+    }\n+\n+    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+    #[test]\n+    fn repair_uses_the_global_max_even_when_it_is_outside_the_tail() {\n+        let d = tmp(\"repair-global\");\n+        let mut body = fixture([9_000]);\n+        let first_len = body.len();\n+        let mut event = row(\"AGENT_OUTPUT\", &\"\\u{4e16}\".repeat(4_000));\n+        for seq in 1..=30 {\n+            event.seq = seq;\n+            body.extend_from_slice(compose_line(&event).unwrap().as_bytes());\n+        }\n+        assert!(body.len() - TAIL_WINDOW as usize > first_len);\n+        std::fs::write(io_log_file_at(&d), &body).unwrap();\n+        assert_eq!(last_seq_at(&d), 30, \"the older maximum is outside the window\");\n+        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"new\")).unwrap(), 9_032);\n+        let repaired = std::fs::read(io_log_file_at(&d)).unwrap();\n+        assert_eq!(&payload_bytes(&repaired)[..31], payload_bytes(&body));\n+        let read = read_after_at(&d, 9_000, None);\n+        assert_eq!(read.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), (9_001..=9_032).collect::<Vec<_>>());\n+    }\n+\n+    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+    #[test]\n+    fn trimming_1251_reset_rows_keeps_the_newest_1000_by_position() {\n+        let d = tmp(\"trim-reset-position\");\n+        let body = fixture((1..=250).chain(1..=1_000).chain([2_000]));\n+        let lines: Vec<_> = body.split_inclusive(|&b| b == b'\\n').collect();\n+        assert_eq!(lines.len(), 1_251);\n+        let expected = lines[251..].concat();\n+        // Negative control: last-N by seq value drops 999 newest rows here.\n+        let value_filtered = lines.iter()\n+            .filter(|line| byte_line_seq(line).is_some_and(|seq| seq >= 1_001))\n+            .copied()\n+            .collect::<Vec<_>>()\n+            .concat();\n+        assert_ne!(value_filtered, expected);\n+        std::fs::write(io_log_file_at(&d), &body).unwrap();\n+        trim_locked(&d, &body, lines.len()).unwrap();\n+        assert_eq!(std::fs::read(io_log_file_at(&d)).unwrap(), expected);\n+        let read = read_after_at(&d, 0, None);\n+        assert_eq!(read.rows.first().unwrap().payload, \"p252世\");\n+        assert_eq!(read.rows.last().unwrap().payload, \"p1251世\");\n+        assert_eq!(read.rows.len(), IO_LOG_MAX_ROWS as usize);\n+    }\n+\n+    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+    #[test]\n+    fn oversized_repair_retains_bounded_newest_history() {\n+        let d = tmp(\"repair-bounded\");\n+        let body = fixture((1..=1_200).chain(1..=100));\n+        std::fs::write(io_log_file_at(&d), &body).unwrap();\n+        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"new\")).unwrap(), 2_201);\n+        let repaired = std::fs::read(io_log_file_at(&d)).unwrap();\n+        assert_eq!(&payload_bytes(&repaired)[..1_000], &payload_bytes(&body)[300..]);\n+        let read = read_after_at(&d, 1_200, None);\n+        assert_eq!(read.rows.len(), 1_001);\n+        assert_eq!(read.rows.first().unwrap().seq, 1_201);\n+        assert_eq!(read.rows.last().unwrap().seq, 2_201);\n+    }\n+\n+    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+    #[test]\n+    fn sequence_exhaustion_refuses_without_modifying_history() {\n+        // Healthy exhaustion, repair exhaustion midway, and enough room for\n+        // repair but not its new row must ALL refuse before touching the file.\n+        for (name, seqs) in [\n+            (\"exhausted-healthy\", vec![u64::MAX]),\n+            (\"exhausted-repair\", vec![u64::MAX - 1, 1]),\n+            (\"exhausted-new-row\", vec![u64::MAX - 2, 1]),\n+        ] {\n+            let d = tmp(name);\n+            let body = fixture(seqs);\n+            std::fs::write(io_log_file_at(&d), &body).unwrap();\n+            assert!(append_at(&d, &row(\"USER_INPUT\", \"new\")).is_err());\n+            assert_eq!(std::fs::read(io_log_file_at(&d)).unwrap(), body);\n+        }\n+        let d = tmp(\"last-available-seq\");\n+        std::fs::write(io_log_file_at(&d), fixture([u64::MAX - 1])).unwrap();\n+        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"last\")).unwrap(), u64::MAX);\n+        let body = std::fs::read(io_log_file_at(&d)).unwrap();\n+        assert!(append_at(&d, &row(\"USER_INPUT\", \"overflow\")).is_err());\n+        assert_eq!(std::fs::read(io_log_file_at(&d)).unwrap(), body);\n+    }\n+\n+    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+    #[test]\n+    fn a_poll_reports_the_true_snapshot_head_independent_of_selected_rows() {\n+        let d = tmp(\"snapshot-head\");\n+        let mut body = fixture([201, 202, 1, 2]);\n+        body.extend_from_slice(b\"203\\tnot json\\n\");\n+        std::fs::write(io_log_file_at(&d), body).unwrap();\n+        let capped = read_after_at(&d, 0, Some(1));\n+        assert_eq!(capped.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![201]);\n+        assert_eq!(capped.head, 203, \"scan past the cap and corrupt JSON\");\n+        let uncapped = read_after_at(&d, 201, None);\n+        assert_eq!(uncapped.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![202]);\n+        assert_eq!(uncapped.head, 203);\n+        for (after, limit) in [(202, None), (203, None), (900, None), (0, Some(0))] {\n+            let read = read_after_at(&d, after, limit);\n+            assert!(read.rows.is_empty());\n+            assert_eq!(read.head, 203, \"after={after}, limit={limit:?}\");\n+        }\n+    }\n*** End Patch\n","internal_chat_message_metadata_passthrough":{"create_time":1788696746.047964,"turn_id":"05ad431a-fba1-4c41-bd99-af1b9e26853e"},"name":"edit","metadata":{"turn_id":"05ad431a-fba1-4c41-bd99-af1b9e26853e"}}]},"duration":133488.6091,"ttft":2825.6720000002533,"completedAt":1788696879034,"contextSnapshot":{"promptTokens":37117,"nonMessageTokens":16812,"compactionEpoch":0}}}
{"type":"message","id":"bd7d80f6","parentId":"ee2ffc0a","timestamp":"2026-09-06T12:14:39.064Z","message":{"role":"toolResult","toolCallId":"call_85puxJdfLK2xdTshPAcSmSKS|ctc_0a8f6f40d1e69e19016a9d58db84b887d2b5a6aa5bb3d08c2c","toolName":"edit","content":[{"type":"text","text":"[.worktrees/iolog-277/crates/spt-store/src/iolog.rs#A841]\n510:    fn tmp(name: &str) -> PathBuf {\n\n515:    }\n516:\n517:    fn fixture(seqs: impl IntoIterator<Item = u64>) -> Vec<u8> {\n518:        let mut body = Vec::new();\n…\n733:    }\n734:\n735:    // [unit->REQ-IO-EVENT-ADAPTER-LOG] appends assign a contiguous, monotonic\n736:    // seq from 1, and a read with no cursor returns them oldest-first.\n764:        assert_eq!(after2.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![3, 4]);\n765:        assert!(\n766:            read_after_at(&d, 4, None).rows.is_empty(),\n767:            \"a cursor at the head sees nothing\"\n768:        );\n859:        assert_eq!(last_seq_at(&d), total, \"seqs never rewind over a trim\");\n860:        assert_eq!(\n861:            read_after_at(&d, 1, None).rows.len() as u64,\n862:            IO_LOG_MAX_ROWS,\n863:            \"a cursor into the DROPPED region still sees everything that survives\"\n864:        );\n\n868:        for i in 1..=(IO_LOG_TRIM_SLACK + 5) {\n\n870:        }\n871:        assert!(\n872:            (read_after_at(&d, 0, None).rows.len() as u64) <= brim,\n873:            \"the retention ceiling holds across the slack cycle\"\n874:        );\n\nWarnings:\nPUT >514: body indented shallower than the anchor, so the landing moved past 1 closing line to after line 515. For the deeper position inside the block, re-issue with the body indented to match."}],"details":{"diff":" 510|    fn tmp(name: &str) -> PathBuf {\n\n 515|    }\n 516|\n+517|    fn fixture(seqs: impl IntoIterator<Item = u64>) -> Vec<u8> {\n+518|        let mut body = Vec::new();\n+519|        for (position, seq) in seqs.into_iter().enumerate() {\n+520|            // Deliberately noncanonical JSON, including an unknown field and\n+521|            // escape spellings: repair must preserve bytes, not just meaning.\n+522|            writeln!(\n+523|                &mut body,\n+524|                \"{seq}\\t{{ \\\"payload\\\": \\\"p{}\\\\u4e16\\\", \\\"kind\\\": \\\"MSG_IN\\\", \\\"at_ms\\\": 1, \\\"future\\\": true }}\",\n+525|                position + 1\n+526|            )\n+527|            .unwrap();\n+528|        }\n+529|        body\n+530|    }\n+531|\n+532|    fn payload_bytes(body: &[u8]) -> Vec<&[u8]> {\n+533|        body.split_inclusive(|&b| b == b'\\n')\n+534|            .map(|line| &line[line.iter().position(|&b| b == b'\\t').unwrap() + 1..])\n+535|            .collect()\n+536|    }\n+537|\n+538|    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+539|    #[test]\n+540|    fn a_tail_window_inside_three_byte_utf8_never_resets_the_seq() {\n+541|        let d = tmp(\"utf8-window\");\n+542|        let mut body = Vec::new();\n+543|        let last = 32;\n+544|        let mut event = row(\"AGENT_OUTPUT\", &\"\\u{4e16}\".repeat(4_000));\n+545|        for seq in 1..=last {\n+546|            event.seq = seq;\n+547|            body.extend_from_slice(compose_line(&event).unwrap().as_bytes());\n+548|        }\n+549|        // Adjust only trailing JSON whitespace until the fixed window bisects\n+550|        // 世. Rows use literal LF on every OS; no text-mode CRLF translation.\n+551|        for _ in 0..3 {\n+552|            let start = body.len() - TAIL_WINDOW as usize;\n+553|            if (0x80..=0xbf).contains(&body[start]) {\n+554|                break;\n+555|            }\n+556|            body.insert(body.len() - 1, b' ');\n+557|        }\n+558|        let start = body.len() - TAIL_WINDOW as usize;\n+559|        assert!((0x80..=0xbf).contains(&body[start]), \"window begins at a continuation byte\");\n+560|        let lead = if body[start - 1] == 0xe4 { start - 1 } else { start - 2 };\n+561|        assert_eq!(&body[lead..lead + 3], \"\\u{4e16}\".as_bytes());\n+562|        std::fs::write(io_log_file_at(&d), body).unwrap();\n+563|        // Mutation-sensitive even though append's independent integrity scan\n+564|        // can mask last_seq_at regressing to read_to_string/InvalidData -> 0.\n+565|        assert_eq!(last_seq_at(&d), last);\n+566|        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"next\")).unwrap(), last + 1);\n+567|    }\n+568|\n+569|    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+570|    #[test]\n+571|    fn a_tail_without_a_complete_row_falls_back_to_the_whole_file() {\n+572|        for terminated in [false, true] {\n+573|            let d = tmp(if terminated { \"giant-lf\" } else { \"giant-no-lf\" });\n+574|            let mut event = row(\"AGENT_OUTPUT\", &\"x\".repeat(TAIL_WINDOW as usize + 100));\n+575|            event.seq = 87;\n+576|            let mut body = compose_line(&event).unwrap();\n+577|            if !terminated {\n+578|                body.pop();\n+579|            }\n+580|            std::fs::write(io_log_file_at(&d), body).unwrap();\n+581|            assert_eq!(last_seq_at(&d), 87, \"terminated={terminated}\");\n+582|        }\n+583|    }\n+584|\n+585|    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+586|    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+587|    #[test]\n+588|    fn reset_blocks_repair_above_the_max_without_changing_payload_bytes() {\n+589|        let d = tmp(\"repair-blocks\");\n+590|        let body = fixture([201, 202, 203, 1, 2, 3]);\n+591|        std::fs::write(io_log_file_at(&d), &body).unwrap();\n+592|        assert_eq!(last_seq_at(&d), 203, \"tail maximum, not its last line\");\n+593|        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"new\")).unwrap(), 210);\n+594|        let repaired = std::fs::read(io_log_file_at(&d)).unwrap();\n+595|        assert_eq!(&payload_bytes(&repaired)[..6], payload_bytes(&body));\n+596|        let read = read_after_at(&d, 203, None);\n+597|        assert_eq!(read.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), (204..=210).collect::<Vec<_>>());\n+598|        assert_eq!(read.rows.last().unwrap().payload, \"new\");\n+599|        // The next append must not repair already-renumbered history again.\n+600|        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"later\")).unwrap(), 211);\n+601|        let later = std::fs::read(io_log_file_at(&d)).unwrap();\n+602|        assert!(later.starts_with(&repaired));\n+603|    }\n+604|\n+605|    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+606|    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+607|    #[test]\n+608|    fn equal_adjacent_seqs_are_repaired() {\n+609|        let d = tmp(\"repair-equal\");\n+610|        std::fs::write(io_log_file_at(&d), fixture([1, 1])).unwrap();\n+611|        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"new\")).unwrap(), 4);\n+612|        let read = read_after_at(&d, 1, None);\n+613|        assert_eq!(read.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![2, 3, 4]);\n+614|    }\n+615|\n+616|    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+617|    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+618|    #[test]\n+619|    fn an_internal_reset_is_repaired_even_when_last_exceeds_first() {\n+620|        let d = tmp(\"repair-internal\");\n+621|        std::fs::write(io_log_file_at(&d), fixture([1, 2, 1, 3])).unwrap();\n+622|        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"new\")).unwrap(), 8);\n+623|        let read = read_after_at(&d, 3, None);\n+624|        assert_eq!(read.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), (4..=8).collect::<Vec<_>>());\n+625|    }\n+626|\n+627|    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+628|    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+629|    #[test]\n+630|    fn repair_uses_the_global_max_even_when_it_is_outside_the_tail() {\n+631|        let d = tmp(\"repair-global\");\n+632|        let mut body = fixture([9_000]);\n+633|        let first_len = body.len();\n+634|        let mut event = row(\"AGENT_OUTPUT\", &\"\\u{4e16}\".repeat(4_000));\n+635|        for seq in 1..=30 {\n+636|            event.seq = seq;\n+637|            body.extend_from_slice(compose_line(&event).unwrap().as_bytes());\n+638|        }\n+639|        assert!(body.len() - TAIL_WINDOW as usize > first_len);\n+640|        std::fs::write(io_log_file_at(&d), &body).unwrap();\n+641|        assert_eq!(last_seq_at(&d), 30, \"the older maximum is outside the window\");\n+642|        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"new\")).unwrap(), 9_032);\n+643|        let repaired = std::fs::read(io_log_file_at(&d)).unwrap();\n+644|        assert_eq!(&payload_bytes(&repaired)[..31], payload_bytes(&body));\n+645|        let read = read_after_at(&d, 9_000, None);\n+646|        assert_eq!(read.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), (9_001..=9_032).collect::<Vec<_>>());\n+647|    }\n+648|\n+649|    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+650|    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+651|    #[test]\n+652|    fn trimming_1251_reset_rows_keeps_the_newest_1000_by_position() {\n+653|        let d = tmp(\"trim-reset-position\");\n+654|        let body = fixture((1..=250).chain(1..=1_000).chain([2_000]));\n+655|        let lines: Vec<_> = body.split_inclusive(|&b| b == b'\\n').collect();\n+656|        assert_eq!(lines.len(), 1_251);\n+657|        let expected = lines[251..].concat();\n+658|        // Negative control: last-N by seq value drops 999 newest rows here.\n+659|        let value_filtered = lines.iter()\n+660|            .filter(|line| byte_line_seq(line).is_some_and(|seq| seq >= 1_001))\n+661|            .copied()\n+662|            .collect::<Vec<_>>()\n+663|            .concat();\n+664|        assert_ne!(value_filtered, expected);\n+665|        std::fs::write(io_log_file_at(&d), &body).unwrap();\n+666|        trim_locked(&d, &body, lines.len()).unwrap();\n+667|        assert_eq!(std::fs::read(io_log_file_at(&d)).unwrap(), expected);\n+668|        let read = read_after_at(&d, 0, None);\n+669|        assert_eq!(read.rows.first().unwrap().payload, \"p252世\");\n+670|        assert_eq!(read.rows.last().unwrap().payload, \"p1251世\");\n+671|        assert_eq!(read.rows.len(), IO_LOG_MAX_ROWS as usize);\n+672|    }\n+673|\n+674|    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+675|    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+676|    #[test]\n+677|    fn oversized_repair_retains_bounded_newest_history() {\n+678|        let d = tmp(\"repair-bounded\");\n+679|        let body = fixture((1..=1_200).chain(1..=100));\n+680|        std::fs::write(io_log_file_at(&d), &body).unwrap();\n+681|        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"new\")).unwrap(), 2_201);\n+682|        let repaired = std::fs::read(io_log_file_at(&d)).unwrap();\n+683|        assert_eq!(&payload_bytes(&repaired)[..1_000], &payload_bytes(&body)[300..]);\n+684|        let read = read_after_at(&d, 1_200, None);\n+685|        assert_eq!(read.rows.len(), 1_001);\n+686|        assert_eq!(read.rows.first().unwrap().seq, 1_201);\n+687|        assert_eq!(read.rows.last().unwrap().seq, 2_201);\n+688|    }\n+689|\n+690|    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+691|    #[test]\n+692|    fn sequence_exhaustion_refuses_without_modifying_history() {\n+693|        // Healthy exhaustion, repair exhaustion midway, and enough room for\n+694|        // repair but not its new row must ALL refuse before touching the file.\n+695|        for (name, seqs) in [\n+696|            (\"exhausted-healthy\", vec![u64::MAX]),\n+697|            (\"exhausted-repair\", vec![u64::MAX - 1, 1]),\n+698|            (\"exhausted-new-row\", vec![u64::MAX - 2, 1]),\n+699|        ] {\n+700|            let d = tmp(name);\n+701|            let body = fixture(seqs);\n+702|            std::fs::write(io_log_file_at(&d), &body).unwrap();\n+703|            assert!(append_at(&d, &row(\"USER_INPUT\", \"new\")).is_err());\n+704|            assert_eq!(std::fs::read(io_log_file_at(&d)).unwrap(), body);\n+705|        }\n+706|        let d = tmp(\"last-available-seq\");\n+707|        std::fs::write(io_log_file_at(&d), fixture([u64::MAX - 1])).unwrap();\n+708|        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"last\")).unwrap(), u64::MAX);\n+709|        let body = std::fs::read(io_log_file_at(&d)).unwrap();\n+710|        assert!(append_at(&d, &row(\"USER_INPUT\", \"overflow\")).is_err());\n+711|        assert_eq!(std::fs::read(io_log_file_at(&d)).unwrap(), body);\n+712|    }\n+713|\n+714|    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+715|    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+716|    #[test]\n+717|    fn a_poll_reports_the_true_snapshot_head_independent_of_selected_rows() {\n+718|        let d = tmp(\"snapshot-head\");\n+719|        let mut body = fixture([201, 202, 1, 2]);\n+720|        body.extend_from_slice(b\"203\\tnot json\\n\");\n+721|        std::fs::write(io_log_file_at(&d), body).unwrap();\n+722|        let capped = read_after_at(&d, 0, Some(1));\n+723|        assert_eq!(capped.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![201]);\n+724|        assert_eq!(capped.head, 203, \"scan past the cap and corrupt JSON\");\n+725|        let uncapped = read_after_at(&d, 201, None);\n+726|        assert_eq!(uncapped.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![202]);\n+727|        assert_eq!(uncapped.head, 203);\n+728|        for (after, limit) in [(202, None), (203, None), (900, None), (0, Some(0))] {\n+729|            let read = read_after_at(&d, after, limit);\n+730|            assert!(read.rows.is_empty());\n+731|            assert_eq!(read.head, 203, \"after={after}, limit={limit:?}\");\n+732|        }\n+733|    }\n+734|\n 517|    // [unit->REQ-IO-EVENT-ADAPTER-LOG] appends assign a contiguous, monotonic\n 518|    // seq from 1, and a read with no cursor returns them oldest-first.\n 546|        assert_eq!(after2.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![3, 4]);\n 547|        assert!(\n-548|            read_after_at(&d, 4, None).is_empty(),\n+766|            read_after_at(&d, 4, None).rows.is_empty(),\n 549|            \"a cursor at the head sees nothing\"\n 550|        );\n 641|        assert_eq!(last_seq_at(&d), total, \"seqs never rewind over a trim\");\n 642|        assert_eq!(\n-643|            read_after_at(&d, 1, None).len() as u64,\n+861|            read_after_at(&d, 1, None).rows.len() as u64,\n 644|            IO_LOG_MAX_ROWS,\n 645|            \"a cursor into the DROPPED region still sees everything that survives\"\n 646|        );\n\n 650|        for i in 1..=(IO_LOG_TRIM_SLACK + 5) {\n\n 652|        }\n 653|        assert!(\n-654|            (read_after_at(&d, 0, None).len() as u64) <= brim,\n+872|            (read_after_at(&d, 0, None).rows.len() as u64) <= brim,\n 655|            \"the retention ceiling holds across the slack cycle\"\n 656|        );","firstChangedLine":515,"op":"update","path":"C:\\Users\\decid\\Documents\\projects\\spt-core\\.worktrees\\iolog-277\\crates\\spt-store\\src\\iolog.rs","snapshotsPruned":true},"isError":false,"timestamp":1788696879064}}
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{"type":"message","id":"5d17b93a","parentId":"ff5b4a3c","timestamp":"2026-09-06T12:15:09.347Z","message":{"role":"toolResult","toolCallId":"call_jccJgZBKypSjxFcsAXecHD15|fc_0a8f6f40d1e69e19016a9d594c7fb887d2aa012be5648f0725","toolName":"read","content":[{"type":"text","text":"[.worktrees/iolog-277/crates/spt-store/src/iolog.rs#A841]\n324:fn append_locked(perch_path: &Path, row: &IoLogRow) -> io::Result<u64> {\n325:    let path = io_log_file_at(perch_path);\n326:    let mut scan = LogScan::read(&path)?;\n327:    let mut repaired = None;\n328:    if scan.damaged {\n329:        // Repair only retained history, in file order, above EVERY old prefix.\n330:        // Old cursors see this history once; normal positional retention bounds\n331:        // that replay. Never deserialize/reserialize the JSON half.\n332:        let keep = retained_rows(scan.rows);\n333:        let mut body = Vec::with_capacity(scan.body.len());\n334:        for line in scan.body.split_inclusive(|&b| b == b'\\n').skip(scan.rows - keep) {\n335:            if byte_line_seq(line).is_some() {\n336:                scan.head = next_seq(scan.head)?;\n337:                let tab = line.iter().position(|&b| b == b'\\t').unwrap();\n338:                write!(&mut body, \"{}\", scan.head)?;\n339:                body.extend_from_slice(&line[tab..]);\n340:            } else {\n341:                // Corrupt unkeyed lines remain unreadable, but are not lost.\n342:                body.extend_from_slice(line);\n343:            }\n344:        }\n345:        scan.rows = keep;\n346:        repaired = Some(body);\n347:    }\n348:    // Preflight the entire repair AND new row before mutating the file: neither\n349:    // saturation nor a partially committed repair may consume the last cursor.\n350:    let seq = next_seq(scan.head)?;\n351:    let mut stamped = row.clone();\n352:    stamped.seq = seq;\n353:    let line = compose_line(&stamped).map_err(io::Error::other)?;\n354:    if let Some(body) = repaired {\n355:        crate::atomic::atomic_write_bytes(&path, &body)?;\n356:        scan.body = body;\n357:    }\n358:    let mut f = std::fs::OpenOptions::new()\n359:        .create(true)\n360:        .append(true)\n361:        .open(&path)?;\n362:    // An externally damaged final line must not absorb the appended prefix.\n363:    if !scan.body.is_empty() && !scan.body.ends_with(b\"\\n\") {\n364:        f.write_all(b\"\\n\")?;\n365:        scan.body.push(b'\\n');\n366:    }\n367:    f.write_all(line.as_bytes())?;\n368:    drop(f);\n369:    // Retention remains best-effort after the event is safely appended. Reuse\n370:    // the scan bytes rather than reading the entire file again for a trim.\n371:    scan.rows += 1;\n372:    if retained_rows(scan.rows) < scan.rows {\n373:        scan.body.extend_from_slice(line.as_bytes());\n374:        let _ = trim_locked(perch_path, &scan.body, scan.rows);\n375:    }\n376:    Ok(seq)\n377:}\n…\n431:    let mut out = IoLogRead::default();\n432:    for line in body.split_inclusive(|&b| b == b'\\n') {\n433:        // Keep scanning prefixes after the limit: head belongs to this entire\n434:        // shared-lock snapshot, not the last delivered (or decodable) row.\n435:        let Some(seq) = byte_line_seq(line) else { continue };\n436:        out.head = out.head.max(seq);\n437:        if seq <= after || limit.is_some_and(|n| out.rows.len() >= n) {\n438:            continue;\n439:        }\n440:        if let Some(row) = parse_line(&String::from_utf8_lossy(line)) {\n441:            out.rows.push(row);\n442:        }\n443:    }\n444:    out\n…\n692:    fn sequence_exhaustion_refuses_without_modifying_history() {\n693:        // Healthy exhaustion, repair exhaustion midway, and enough room for\n694:        // repair but not its new row must ALL refuse before touching the file.\n695:        for (name, seqs) in [\n696:            (\"exhausted-healthy\", vec![u64::MAX]),\n697:            (\"exhausted-repair\", vec![u64::MAX - 1, 1]),\n698:            (\"exhausted-new-row\", vec![u64::MAX - 2, 1]),\n699:        ] {\n700:            let d = tmp(name);\n701:            let body = fixture(seqs);\n702:            std::fs::write(io_log_file_at(&d), &body).unwrap();\n703:            assert!(append_at(&d, &row(\"USER_INPUT\", \"new\")).is_err());\n704:            assert_eq!(std::fs::read(io_log_file_at(&d)).unwrap(), body);\n705:        }\n706:        let d = tmp(\"last-available-seq\");\n707:        std::fs::write(io_log_file_at(&d), fixture([u64::MAX - 1])).unwrap();\n708:        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"last\")).unwrap(), u64::MAX);\n709:        let body = std::fs::read(io_log_file_at(&d)).unwrap();\n710:        assert!(append_at(&d, &row(\"USER_INPUT\", \"overflow\")).is_err());\n711:        assert_eq!(std::fs::read(io_log_file_at(&d)).unwrap(), body);\n712:    }\n713:\n714:    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n715:    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n716:    #[test]\n717:    fn a_poll_reports_the_true_snapshot_head_independent_of_selected_rows() {\n718:        let d = tmp(\"snapshot-head\");\n719:        let mut body = fixture([201, 202, 1, 2]);\n720:        body.extend_from_slice(b\"203\\tnot json\\n\");\n721:        std::fs::write(io_log_file_at(&d), body).unwrap();\n722:        let capped = read_after_at(&d, 0, Some(1));\n723:        assert_eq!(capped.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![201]);\n724:        assert_eq!(capped.head, 203, \"scan past the cap and corrupt JSON\");\n725:        let uncapped = read_after_at(&d, 201, None);\n726:        assert_eq!(uncapped.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![202]);\n727:        assert_eq!(uncapped.head, 203);\n728:        for (after, limit) in [(202, None), (203, None), (900, None), (0, Some(0))] {\n729:            let read = read_after_at(&d, after, limit);\n730:            assert!(read.rows.is_empty());\n731:            assert_eq!(read.head, 203, \"after={after}, limit={limit:?}\");\n732:        }\n733:    }\n734:\n735:    // [unit->REQ-IO-EVENT-ADAPTER-LOG] appends assign a contiguous, monotonic"}],"details":{"displayContent":{"text":"fn append_locked(perch_path: &Path, row: &IoLogRow) -> io::Result<u64> {\n    let path = io_log_file_at(perch_path);\n    let mut scan = LogScan::read(&path)?;\n    let mut repaired = None;\n    if scan.damaged {\n        // Repair only retained history, in file order, above EVERY old prefix.\n        // Old cursors see this history once; normal positional retention bounds\n        // that replay. Never deserialize/reserialize the JSON half.\n        let keep = retained_rows(scan.rows);\n        let mut body = Vec::with_capacity(scan.body.len());\n        for line in scan.body.split_inclusive(|&b| b == b'\\n').skip(scan.rows - keep) {\n            if byte_line_seq(line).is_some() {\n                scan.head = next_seq(scan.head)?;\n                let tab = line.iter().position(|&b| b == b'\\t').unwrap();\n                write!(&mut body, \"{}\", scan.head)?;\n                body.extend_from_slice(&line[tab..]);\n            } else {\n                // Corrupt unkeyed lines remain unreadable, but are not lost.\n                body.extend_from_slice(line);\n            }\n        }\n        scan.rows = keep;\n        repaired = Some(body);\n    }\n    // Preflight the entire repair AND new row before mutating the file: neither\n    // saturation nor a partially committed repair may consume the last cursor.\n    let seq = next_seq(scan.head)?;\n    let mut stamped = row.clone();\n    stamped.seq = seq;\n    let line = compose_line(&stamped).map_err(io::Error::other)?;\n    if let Some(body) = repaired {\n        crate::atomic::atomic_write_bytes(&path, &body)?;\n        scan.body = body;\n    }\n    let mut f = std::fs::OpenOptions::new()\n        .create(true)\n        .append(true)\n        .open(&path)?;\n    // An externally damaged final line must not absorb the appended prefix.\n    if !scan.body.is_empty() && !scan.body.ends_with(b\"\\n\") {\n        f.write_all(b\"\\n\")?;\n        scan.body.push(b'\\n');\n    }\n    f.write_all(line.as_bytes())?;\n    drop(f);\n    // Retention remains best-effort after the event is safely appended. Reuse\n    // the scan bytes rather than reading the entire file again for a trim.\n    scan.rows += 1;\n    if retained_rows(scan.rows) < scan.rows {\n        scan.body.extend_from_slice(line.as_bytes());\n        let _ = trim_locked(perch_path, &scan.body, scan.rows);\n    }\n    Ok(seq)\n}\n…\n    let mut out = IoLogRead::default();\n    for line in body.split_inclusive(|&b| b == b'\\n') {\n        // Keep scanning prefixes after the limit: head belongs to this entire\n        // shared-lock snapshot, not the last delivered (or decodable) row.\n        let Some(seq) = byte_line_seq(line) else { continue };\n        out.head = out.head.max(seq);\n        if seq <= after || limit.is_some_and(|n| out.rows.len() >= n) {\n            continue;\n        }\n        if let Some(row) = parse_line(&String::from_utf8_lossy(line)) {\n            out.rows.push(row);\n        }\n    }\n    out\n…\n    fn sequence_exhaustion_refuses_without_modifying_history() {\n        // Healthy exhaustion, repair exhaustion midway, and enough room for\n        // repair but not its new row must ALL refuse before touching the file.\n        for (name, seqs) in [\n            (\"exhausted-healthy\", vec![u64::MAX]),\n            (\"exhausted-repair\", vec![u64::MAX - 1, 1]),\n            (\"exhausted-new-row\", vec![u64::MAX - 2, 1]),\n        ] {\n            let d = tmp(name);\n            let body = fixture(seqs);\n            std::fs::write(io_log_file_at(&d), &body).unwrap();\n            assert!(append_at(&d, &row(\"USER_INPUT\", \"new\")).is_err());\n            assert_eq!(std::fs::read(io_log_file_at(&d)).unwrap(), body);\n        }\n        let d = tmp(\"last-available-seq\");\n        std::fs::write(io_log_file_at(&d), fixture([u64::MAX - 1])).unwrap();\n        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"last\")).unwrap(), u64::MAX);\n        let body = std::fs::read(io_log_file_at(&d)).unwrap();\n        assert!(append_at(&d, &row(\"USER_INPUT\", \"overflow\")).is_err());\n        assert_eq!(std::fs::read(io_log_file_at(&d)).unwrap(), body);\n    }\n\n    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n    #[test]\n    fn a_poll_reports_the_true_snapshot_head_independent_of_selected_rows() {\n        let d = tmp(\"snapshot-head\");\n        let mut body = fixture([201, 202, 1, 2]);\n        body.extend_from_slice(b\"203\\tnot json\\n\");\n        std::fs::write(io_log_file_at(&d), body).unwrap();\n        let capped = read_after_at(&d, 0, Some(1));\n        assert_eq!(capped.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![201]);\n        assert_eq!(capped.head, 203, \"scan past the cap and corrupt JSON\");\n        let uncapped = read_after_at(&d, 201, None);\n        assert_eq!(uncapped.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![202]);\n        assert_eq!(uncapped.head, 203);\n        for (after, limit) in [(202, None), (203, None), (900, None), (0, Some(0))] {\n            let read = read_after_at(&d, after, limit);\n            assert!(read.rows.is_empty());\n            assert_eq!(read.head, 203, \"after={after}, limit={limit:?}\");\n        }\n    }\n\n    // [unit->REQ-IO-EVENT-ADAPTER-LOG] appends assign a contiguous, monotonic","startLine":324,"lineNumbers":[324,325,326,327,328,329,330,331,332,333,334,335,336,337,338,339,340,341,342,343,344,345,346,347,348,349,350,351,352,353,354,355,356,357,358,359,360,361,362,363,364,365,366,367,368,369,370,371,372,373,374,375,376,377,null,431,432,433,434,435,436,437,438,439,440,441,442,443,444,null,692,693,694,695,696,697,698,699,700,701,702,703,704,705,706,707,708,709,710,711,712,713,714,715,716,717,718,719,720,721,722,723,724,725,726,727,728,729,730,731,732,733,734,735]},"fileSize":40704,"meta":{"source":{"type":"path","value":"C:/Users/decid/Documents/projects/spt-core/.worktrees/iolog-277/crates/spt-store/src/iolog.rs"}}},"isError":false,"timestamp":1788696909347}}
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{"type":"message","id":"b2a636df","parentId":"960c7cca","timestamp":"2026-09-06T12:15:34.694Z","message":{"role":"assistant","content":[{"type":"thinking","thinking":"**Refining retained-body helpers**\n\n**Simplifying retention allocation**"},{"type":"toolCall","id":"call_euzB6dPpVpdN1f8PgH8Kp9zC|ctc_0a8f6f40d1e69e19016a9d595f6a1087d28887562c805c3f29","name":"edit","arguments":{"input":"*** Begin Patch\n[C:/Users/decid/Documents/projects/spt-core/.worktrees/iolog-277/crates/spt-store/src/iolog.rs#A841]\nPUT 333.=334:\n+        let offset = scan.body\n+            .split_inclusive(|&b| b == b'\\n')\n+            .take(scan.rows - keep)\n+            .map(<[u8]>::len)\n+            .sum::<usize>();\n+        let retained = &scan.body[offset..];\n+        let mut body = Vec::with_capacity(retained.len());\n+        for line in retained.split_inclusive(|&b| b == b'\\n') {\nCUT 362.=366\nPUT 440.=440:\n+        if let Some(row) = std::str::from_utf8(line).ok().and_then(parse_line) {\nPUT >712:\n+\n+    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+    #[test]\n+    fn healthy_sequence_gaps_do_not_trigger_repair_or_retention() {\n+        let d = tmp(\"healthy-gaps\");\n+        let body = fixture([1, 5_000]);\n+        std::fs::write(io_log_file_at(&d), &body).unwrap();\n+        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"new\")).unwrap(), 5_001);\n+        assert!(std::fs::read(io_log_file_at(&d)).unwrap().starts_with(&body));\n+        let read = read_after_at(&d, 0, None);\n+        assert_eq!(read.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![1, 5_000, 5_001]);\n+    }\n*** End Patch\n"},"customWireName":"edit"}],"api":"openai-codex-responses","provider":"openai-codex","model":"gpt-6-astra","usage":{"input":2329,"output":689,"cacheRead":41728,"cacheWrite":0,"totalTokens":44746,"reasoningTokens":284,"cost":{"input":0,"output":0,"cacheRead":0,"cacheWrite":0,"total":0}},"stopReason":"toolUse","timestamp":1788696909398,"responseId":"resp_0a8f6f40d1e69e19016a9d594db8c887d2a0753acb9ec1477a","providerPayload":{"type":"openaiResponsesHistory","provider":"openai-codex","dt":true,"items":[{"id":"rs_0a8f6f40d1e69e19016a9d594fda4887d29c88aa3d38289ab1","type":"reasoning","content":[],"encrypted_content":"gAAAAABqnVlf8c5adI7k-yx7xekroPjupUsvJBswq2Tkurg_ARpRwCTlytBStE2maWBAvlZXG9q4NSBHzrrSBwW_o5Ccclw30OBgf83NVs1ISZUPtg93cSacIwzDUD2FwCap18APG11aYQBMi5t1c4hJVUFW2OBzDTzhURNh7jzoH0UqUFRdBSfu-h14HXgThvsvgC6Mj1PGJWIy5dJ-7XSgHSH617LsrSkjHG1FySIGzfcE4Afxlf9Se5ALTsHTv95U2OPbToBjZ6Vk895PGNkiI588u1bD-eP63jDDAH7W7DE6y6_EDKAWTJqYVpmYPbYLA1G10U5XnlC_b29sfo3CliTFVzQ0h1cP0IHer_mzo3au6Ghjahze-GkoE2mMLALI1D8cQDEfBSMNMqcvL9k5OG9bsZfthzhhqy9z4cGvHs3Eol78sSj7sTwdVEVcLsYF6bMsMWxf1CQk7PuKTx886IKtZFkzm-LxrKjqEOIiuG26Leg_BPubq5EttBQvpGn4UWOWjgkDkZSrmd_q0lguOFOdafNelfaTEgRJBW7Tj8UKgCnLd-un8WI_bRY3IFS89IGFzDFHiNrV_MlES5Ni04genoXuN8ERfrp0oTh5Jhv4trJZ9Y0A_48to_p2t7yuaeQQ70tHZLmjk1kB9_uaB3gkATcuVvn5RvbF_U_lx9DfEI98c9vtoYjOD_jr_PlIxEDu8tyUnO_AGhQQ--C-jhQNkL3gqRB9e-kTk9XqcCnMEbk-MLP9dTJK6a9Z5WaGuNjd5XIJ75kpOQUKKz5wu4vTQFFpfJ9I7y4mB2jq9zRizGLiVW0rLOipv6LZRrU6wBVrsEYWGi7Vhh3Q4RpuCdedfUBty227Hxesb56I99laumvDHzpxA9MZ4aZMIg4qwpuHPRGF7VUOwnPyXfFU5lFmzJIt1dIKwNnNpHwJ0KwPb16xPpubMowxrhedrxH0PmoN5hLN9x-hDS8bNvNkRGteDmy1iij7x8D12LrkDVBt-5p06JtoISKVm0RvVf53GIXcZFg_lLcInMPSIgjK3-EEWSG-PrWeLmvA08Yio575kRON3HXSVDXhtqbGMxVlNOdBRf8X8jyZPEaDd8DZvJInPJ2iiTpjp-YByXZk-rFlNoTTtfxyJWy25SCuQPPk-bIa1Uwg0Tm5Dg5MF0kFq6Kj82ko_nR49f4FCGQKvs8KOgtqoJ-cIGB8zpXfPyPc6Rcf4wAqeaP-3CSFIcp1zpeZCgMUYtUUI9D5JgsS5nMKTVrhUF70gZQMyYaHreR_LIqoQcLDGvzIYU60ondI4D7r48fiut4xbQPCRkdxZkcql6aR-nhHsjtvkUN7AKpo0KB3AzMfUP3Mc8oWGenU31ZmaxinKvVEU1lXI0Z4t-6PxBcAv7QnRO8D6GcQLQ3j3xV_Iz5vtBZm8TYwQ4W6JdS96g_BLT4wtb8ZiRLRzsh5FgTjuahDucPaMGBuA_gtJAmLIMkvxwuIW7XGnP2WMMN9lSAh33nEJfmQLKlAt7yhrk-oZO5q2YYrH4AnFaSConxhUrNRnm6DqspWgPbRouk-IsiZN21jeSK3QKO1GKc5eSLgdyZ2R8ZV6vitp6g4J53eNf6l184EezW-wSac144Od98yQDwPZPehul6ig9nlyHGLXlyl0x2dCBNyXR3-cxEw_R663IhU-i3LCDo8KT9azy5JqgjC8-jiI46TxbZi4_KqGyDA9TW85bz76xeKM3fCl7yIRovAWtOrDl4qxV3t47m2uWIzaXMLbD4jF3yLoJmxTDvZGqO58lXmKXIFJfRQ-LhMfXaIbJNdISEbItOYrcC7z7GEUQ4Wwjab72e93gxa3LC51B4p2RZ4vuZccTvTqM91GKOBw4lpCS4U7HefA1OyIEYW3OwnreTBke341x802eYBNBE5apzjx9QS6KqhZVvE3e1djApqihduGDYwLE9BBSGhNQ3dRH8vzyvKCf9IWp_koOxgxMmxuzVcTKxUYPPJARN96Udg0STWaVgHqCHJ7mnIAG9uk_uPGQ2RDfl7iZUW33LNACfPmLkJSE52WxM9YRTHBi3ZiZ1Y8VGXN8r_xrqMvDxqZM7FelWTqhpYklZdkTcMjDPk-xgJ9sBZRgQ5oaAp4SflOg6lb64Nxqf8sE0IMjKJy1TOLpp67xYN5CXZIex5RPhlrzO3wqwzvgTediI5_UVEShttjwFvWkc_vQb6G6aTaBcXZkwF_OdUCV2qMaJ9TTq7w5bSeAKfOZrueZ1UzaYt9AYNWy5D9I3XJYzUOI06mKBqp8vlEPObe2ebIlaAG9utmoy_E6n4ZciiWDHUbu91CBwuBsTR6qUdf8P28Xaq4sQyc1WugaRmfk3wUpU0KY9_GiuwUzx9VAb-NBpFCcCZ1rQiNWKV6n735WCevduyjluj-x8QSqmB7Kqo8EuevIzXs82gTeTJ6jG9E7sHtwLHI1X5G0RAh0Scd6l4ieqVbJZ2duGpOU-a5njvLPARND5RzjLUs6Pk0HhJIvUSczckXPGT3wP-DjqQf8RIDP1ERwD5TAO6kyHN9jcxnrp6nTM2ReeCmuPIFZcuL7vs5TGXxl1FsPAohoSrp0HJ6hKv65rdIe7IjGFyxKJ8fqxF386akJqEZVCGuWfCePSKIqLiFc2Z1DKbdvrQ07P1RKQEbVR67upLpEO7pZ7NU-zmwQba3GAOXXjZZBUkee6iojDd_NjBlPPBy2ito0MlwhPWm44L9JgKtjTMCO-CD1TF6Bofv62l0TlFEQphj7ko_pmO-ZBJxY8PgswVa6iYH_QRN2ngrpfedztsQ2ndh9H1tEYhRO_AS-MJJjzpqQhLTbto0EJzHp-IkeXIhL-IfTc7TEVq5tSdAJVVcYbMZ2wPkS1n0ncpAgjzaI9_CXM5fzV-7wZ4dtBtmzVl6UPGgrPO4C-yWhUZHM28OTjiAU0FsotVRfyVyrthsfL2NIdbIkS07zWSlNFnmTcKHXEc3EEK3y44ToYotPOuJwMb5ykDmMQFWaDbj19NTX0m3kKU9sAXQK8zWI8fkj9rFspc9JzjpOOUYdCKuIvD--nMTOx8_R4nwFIENzzSg-zH3ES3qYexatEA-4hdUHpmmi3lWkXlBB87LhewK-eVXWO0m4ZS4oyLAsz7eEgLOUXbTFePB3hAN_iPc_b89oZI4ZEDJvhvPXHB8CqJCRfW1vHun006TcDoK_JxvkgKesnD8Rigtu32UCguuUtYJxSYb5O7hIntfm2k8SpVkNsCp3MZRet_LQJy69dEx97BHnUCefm7BHxxQnLTzLADqjZIwfA-JmfvVvLSL7CR7n9yups=","internal_chat_message_metadata_passthrough":{"turn_id":"05ad431a-fba1-4c41-bd99-af1b9e26853e"},"summary":[{"type":"summary_text","text":"**Refining retained-body helpers**"},{"type":"summary_text","text":"**Simplifying retention allocation**"}],"metadata":{"turn_id":"05ad431a-fba1-4c41-bd99-af1b9e26853e"}},{"id":"ctc_0a8f6f40d1e69e19016a9d595f6a1087d28887562c805c3f29","type":"custom_tool_call","status":"completed","call_id":"call_euzB6dPpVpdN1f8PgH8Kp9zC","input":"*** Begin Patch\n[C:/Users/decid/Documents/projects/spt-core/.worktrees/iolog-277/crates/spt-store/src/iolog.rs#A841]\nPUT 333.=334:\n+        let offset = scan.body\n+            .split_inclusive(|&b| b == b'\\n')\n+            .take(scan.rows - keep)\n+            .map(<[u8]>::len)\n+            .sum::<usize>();\n+        let retained = &scan.body[offset..];\n+        let mut body = Vec::with_capacity(retained.len());\n+        for line in retained.split_inclusive(|&b| b == b'\\n') {\nCUT 362.=366\nPUT 440.=440:\n+        if let Some(row) = std::str::from_utf8(line).ok().and_then(parse_line) {\nPUT >712:\n+\n+    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+    #[test]\n+    fn healthy_sequence_gaps_do_not_trigger_repair_or_retention() {\n+        let d = tmp(\"healthy-gaps\");\n+        let body = fixture([1, 5_000]);\n+        std::fs::write(io_log_file_at(&d), &body).unwrap();\n+        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"new\")).unwrap(), 5_001);\n+        assert!(std::fs::read(io_log_file_at(&d)).unwrap().starts_with(&body));\n+        let read = read_after_at(&d, 0, None);\n+        assert_eq!(read.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![1, 5_000, 5_001]);\n+    }\n*** End Patch\n","internal_chat_message_metadata_passthrough":{"create_time":1788696909.98433,"turn_id":"05ad431a-fba1-4c41-bd99-af1b9e26853e"},"name":"edit","metadata":{"turn_id":"05ad431a-fba1-4c41-bd99-af1b9e26853e"}}]},"duration":25293.4160000002,"ttft":2472.561499999836,"completedAt":1788696934692,"contextSnapshot":{"promptTokens":44057,"nonMessageTokens":16812,"compactionEpoch":0}}}
{"type":"message","id":"28580e5c","parentId":"b2a636df","timestamp":"2026-09-06T12:15:34.725Z","message":{"role":"toolResult","toolCallId":"call_euzB6dPpVpdN1f8PgH8Kp9zC|ctc_0a8f6f40d1e69e19016a9d595f6a1087d28887562c805c3f29","toolName":"edit","content":[{"type":"text","text":"[.worktrees/iolog-277/crates/spt-store/src/iolog.rs#4489]\n331:        // that replay. Never deserialize/reserialize the JSON half.\n332:        let keep = retained_rows(scan.rows);\n333:        let offset = scan.body\n334:            .split_inclusive(|&b| b == b'\\n')\n…\n339:        let mut body = Vec::with_capacity(retained.len());\n340:        for line in retained.split_inclusive(|&b| b == b'\\n') {\n341:            if byte_line_seq(line).is_some() {\n342:                scan.head = next_seq(scan.head)?;\n\n346:            } else {\n\n349:            }\n350:        }\n\n364:    let mut f = std::fs::OpenOptions::new()\n\n366:        .append(true)\n367:        .open(&path)?;\n368:    f.write_all(line.as_bytes())?;\n369:    drop(f);\n\n438:        if seq <= after || limit.is_some_and(|n| out.rows.len() >= n) {\n439:            continue;\n440:        }\n441:        if let Some(row) = std::str::from_utf8(line).ok().and_then(parse_line) {\n442:            out.rows.push(row);\n443:        }\n716:    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n717:    #[test]\n718:    fn healthy_sequence_gaps_do_not_trigger_repair_or_retention() {\n719:        let d = tmp(\"healthy-gaps\");\n…\n729:    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n730:    #[test]\n731:    fn a_poll_reports_the_true_snapshot_head_independent_of_selected_rows() {\n732:        let d = tmp(\"snapshot-head\");\n\n747:    }"}],"details":{"diff":" 331|        // that replay. Never deserialize/reserialize the JSON half.\n 332|        let keep = retained_rows(scan.rows);\n-333|        let mut body = Vec::with_capacity(scan.body.len());\n-334|        for line in scan.body.split_inclusive(|&b| b == b'\\n').skip(scan.rows - keep) {\n+333|        let offset = scan.body\n+334|            .split_inclusive(|&b| b == b'\\n')\n+335|            .take(scan.rows - keep)\n+336|            .map(<[u8]>::len)\n+337|            .sum::<usize>();\n+338|        let retained = &scan.body[offset..];\n+339|        let mut body = Vec::with_capacity(retained.len());\n+340|        for line in retained.split_inclusive(|&b| b == b'\\n') {\n 335|            if byte_line_seq(line).is_some() {\n 336|                scan.head = next_seq(scan.head)?;\n\n 340|            } else {\n\n 343|            }\n 344|        }\n\n 358|    let mut f = std::fs::OpenOptions::new()\n\n 360|        .append(true)\n 361|        .open(&path)?;\n-362|    // An externally damaged final line must not absorb the appended prefix.\n-363|    if !scan.body.is_empty() && !scan.body.ends_with(b\"\\n\") {\n-364|        f.write_all(b\"\\n\")?;\n-365|        scan.body.push(b'\\n');\n-366|    }\n 367|    f.write_all(line.as_bytes())?;\n 368|    drop(f);\n\n 437|        if seq <= after || limit.is_some_and(|n| out.rows.len() >= n) {\n 438|            continue;\n 439|        }\n-440|        if let Some(row) = parse_line(&String::from_utf8_lossy(line)) {\n+441|        if let Some(row) = std::str::from_utf8(line).ok().and_then(parse_line) {\n 441|            out.rows.push(row);\n 442|        }\n 715|    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n 716|    #[test]\n+718|    fn healthy_sequence_gaps_do_not_trigger_repair_or_retention() {\n+719|        let d = tmp(\"healthy-gaps\");\n+720|        let body = fixture([1, 5_000]);\n+721|        std::fs::write(io_log_file_at(&d), &body).unwrap();\n+722|        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"new\")).unwrap(), 5_001);\n+723|        assert!(std::fs::read(io_log_file_at(&d)).unwrap().starts_with(&body));\n+724|        let read = read_after_at(&d, 0, None);\n+725|        assert_eq!(read.rows.iter().map(|r| r.seq).collect::<Vec<_>>(), vec![1, 5_000, 5_001]);\n+726|    }\n+727|\n+728|    // [unit->REQ-IO-EVENT-ADAPTER-LOG]\n+729|    // [unit->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n+730|    #[test]\n 717|    fn a_poll_reports_the_true_snapshot_head_independent_of_selected_rows() {\n 718|        let d = tmp(\"snapshot-head\");\n\n 733|    }","firstChangedLine":333,"op":"update","path":"C:\\Users\\decid\\Documents\\projects\\spt-core\\.worktrees\\iolog-277\\crates\\spt-store\\src\\iolog.rs","snapshotsPruned":true},"isError":false,"timestamp":1788696934725}}
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{"type":"message","id":"3bf5dafe","parentId":"5475bb8f","timestamp":"2026-09-06T12:16:34.062Z","message":{"role":"assistant","content":[{"type":"toolCall","id":"call_Kvf6w1oFeyAndPJItHtUqEZ3|ctc_0a8f6f40d1e69e19016a9d599aacfc87d2b06c4dbc1648cdb9","name":"edit","arguments":{"input":"*** Begin Patch\n[C:/Users/decid/Documents/projects/spt-core/.worktrees/iolog-277/crates/spt-store/src/iolog.rs#4489]\nPUT 263.=264:\n+/// rewrite bytes. Healthy logs are bounded to 1250 payload-capped rows (on-disk\n+/// bytes include JSON escaping); legacy oversized logs pay their full scan\n+/// until repaired. Healthy appends scan but do not rewrite the file.\nPUT 680.=680:\n+        // The old global maximum is also OUTSIDE the retained suffix.\n+        let body = fixture([9_000].into_iter().chain(1..=1_299));\nPUT 682.=682:\n+        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"new\")).unwrap(), 10_001);\nPUT 685.=685:\n+        let read = read_after_at(&d, 9_000, None);\nPUT 687.=688:\n+        assert_eq!(read.rows.first().unwrap().seq, 9_001);\n+        assert_eq!(read.rows.last().unwrap().seq, 10_001);\n*** End Patch\n"},"customWireName":"edit"}],"api":"openai-codex-responses","provider":"openai-codex","model":"gpt-6-astra","usage":{"input":1664,"output":250,"cacheRead":45056,"cacheWrite":0,"totalTokens":46970,"cost":{"input":0,"output":0,"cacheRead":0,"cacheWrite":0,"total":0}},"stopReason":"toolUse","timestamp":1788696983080,"responseId":"resp_0a8f6f40d1e69e19016a9d5997519887d2a8ef6c021662ea4c","providerPayload":{"type":"openaiResponsesHistory","provider":"openai-codex","dt":true,"items":[{"id":"ctc_0a8f6f40d1e69e19016a9d599aacfc87d2b06c4dbc1648cdb9","type":"custom_tool_call","status":"completed","call_id":"call_Kvf6w1oFeyAndPJItHtUqEZ3","input":"*** Begin Patch\n[C:/Users/decid/Documents/projects/spt-core/.worktrees/iolog-277/crates/spt-store/src/iolog.rs#4489]\nPUT 263.=264:\n+/// rewrite bytes. Healthy logs are bounded to 1250 payload-capped rows (on-disk\n+/// bytes include JSON escaping); legacy oversized logs pay their full scan\n+/// until repaired. Healthy appends scan but do not rewrite the file.\nPUT 680.=680:\n+        // The old global maximum is also OUTSIDE the retained suffix.\n+        let body = fixture([9_000].into_iter().chain(1..=1_299));\nPUT 682.=682:\n+        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"new\")).unwrap(), 10_001);\nPUT 685.=685:\n+        let read = read_after_at(&d, 9_000, None);\nPUT 687.=688:\n+        assert_eq!(read.rows.first().unwrap().seq, 9_001);\n+        assert_eq!(read.rows.last().unwrap().seq, 10_001);\n*** End Patch\n","internal_chat_message_metadata_passthrough":{"create_time":1788696983.580893,"turn_id":"05ad431a-fba1-4c41-bd99-af1b9e26853e"},"name":"edit","metadata":{"turn_id":"05ad431a-fba1-4c41-bd99-af1b9e26853e"}}]},"duration":10979.215499999933,"ttft":3614.4139999998733,"completedAt":1788696994060,"contextSnapshot":{"promptTokens":46720,"nonMessageTokens":16812,"compactionEpoch":0}}}
{"type":"message","id":"05a5b8d5","parentId":"3bf5dafe","timestamp":"2026-09-06T12:16:34.104Z","message":{"role":"toolResult","toolCallId":"call_Kvf6w1oFeyAndPJItHtUqEZ3|ctc_0a8f6f40d1e69e19016a9d599aacfc87d2b06c4dbc1648cdb9","toolName":"edit","content":[{"type":"text","text":"[.worktrees/iolog-277/crates/spt-store/src/iolog.rs#2BE2]\n261:\n262:/// One full read supplies integrity, global maximum, retention count, and any\n263:/// rewrite bytes. Healthy logs are bounded to 1250 payload-capped rows (on-disk\n264:/// bytes include JSON escaping); legacy oversized logs pay their full scan\n265:/// until repaired. Healthy appends scan but do not rewrite the file.\n266:/// Endpoints alone cannot prove integrity: 1, 2, 1, 3 has increasing endpoints.\n267:// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n679:    fn oversized_repair_retains_bounded_newest_history() {\n680:        let d = tmp(\"repair-bounded\");\n681:        // The old global maximum is also OUTSIDE the retained suffix.\n682:        let body = fixture([9_000].into_iter().chain(1..=1_299));\n683:        std::fs::write(io_log_file_at(&d), &body).unwrap();\n684:        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"new\")).unwrap(), 10_001);\n685:        let repaired = std::fs::read(io_log_file_at(&d)).unwrap();\n686:        assert_eq!(&payload_bytes(&repaired)[..1_000], &payload_bytes(&body)[300..]);\n687:        let read = read_after_at(&d, 9_000, None);\n688:        assert_eq!(read.rows.len(), 1_001);\n689:        assert_eq!(read.rows.first().unwrap().seq, 9_001);\n690:        assert_eq!(read.rows.last().unwrap().seq, 10_001);\n691:    }\n692:"}],"details":{"diff":" 261|\n 262|/// One full read supplies integrity, global maximum, retention count, and any\n-263|/// rewrite bytes. Healthy logs are bounded to 1250 rows (about 20MB at the\n-264|/// payload cap); legacy oversized logs pay their full scan until repaired.\n+263|/// rewrite bytes. Healthy logs are bounded to 1250 payload-capped rows (on-disk\n+264|/// bytes include JSON escaping); legacy oversized logs pay their full scan\n+265|/// until repaired. Healthy appends scan but do not rewrite the file.\n 265|/// Endpoints alone cannot prove integrity: 1, 2, 1, 3 has increasing endpoints.\n 266|// [impl->REQ-HAZARD-IOLOG-SEQ-MONOTONIC]\n 678|    fn oversized_repair_retains_bounded_newest_history() {\n 679|        let d = tmp(\"repair-bounded\");\n-680|        let body = fixture((1..=1_200).chain(1..=100));\n+681|        // The old global maximum is also OUTSIDE the retained suffix.\n+682|        let body = fixture([9_000].into_iter().chain(1..=1_299));\n 681|        std::fs::write(io_log_file_at(&d), &body).unwrap();\n-682|        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"new\")).unwrap(), 2_201);\n+684|        assert_eq!(append_at(&d, &row(\"USER_INPUT\", \"new\")).unwrap(), 10_001);\n 683|        let repaired = std::fs::read(io_log_file_at(&d)).unwrap();\n 684|        assert_eq!(&payload_bytes(&repaired)[..1_000], &payload_bytes(&body)[300..]);\n-685|        let read = read_after_at(&d, 1_200, None);\n+687|        let read = read_after_at(&d, 9_000, None);\n 686|        assert_eq!(read.rows.len(), 1_001);\n-687|        assert_eq!(read.rows.first().unwrap().seq, 1_201);\n-688|        assert_eq!(read.rows.last().unwrap().seq, 2_201);\n+689|        assert_eq!(read.rows.first().unwrap().seq, 9_001);\n+690|        assert_eq!(read.rows.last().unwrap().seq, 10_001);\n 689|    }\n 690|","firstChangedLine":263,"op":"update","path":"C:\\Users\\decid\\Documents\\projects\\spt-core\\.worktrees\\iolog-277\\crates\\spt-store\\src\\iolog.rs","snapshotsPruned":true},"isError":false,"timestamp":1788696994104}}
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{"type":"message","id":"0f078f4f","parentId":"b493c8e6","timestamp":"2026-09-06T12:17:26.526Z","message":{"role":"assistant","content":[{"type":"thinking","thinking":"**Checking integration points**"},{"type":"toolCall","id":"call_qIjAsTUREljg9Des82l6iBk2|fc_0a8f6f40d1e69e19016a9d59b72e7087d2ad1c4d719de448ac","name":"yield","arguments":{"data":{"file":"C:/Users/decid/Documents/projects/spt-core/.worktrees/iolog-277/crates/spt-store/src/iolog.rs","status":"Source and regressions implemented; no validation or formatting commands run, as assigned.","design":["last_seq_at reads bytes, discards the fragment through its first LF before lossy decoding, returns the maximum complete-row prefix in the window, and falls back to whole-file bytes if no complete row remains (including a giant LF-terminated row).","Append performs one whole-file byte read under the existing exclusive stable lock. Its single integrity scan collects physical-line count, global maximum, and any adjacent non-increase (<=), including duplicates and internal resets. Healthy appends do not rewrite history.","Damaged logs retain file-order history using normal last-N retention, then renumber retained keyed rows above the pre-repair global maximum without changing JSON payload bytes. Oversized history retains the newest 1000 rows before repair. Unkeyed corrupt lines remain unchanged and count toward retention.","All repair increments and the appended sequence use checked_add. Repair and new-row serialization are preflighted before any mutation, so exhaustion refuses without modifying history.","Trim uses physical-line positions and retains the newest 1000 only above 1250. It reuses the append scan's bytes rather than rereading the file; ordinary post-append trim remains best-effort.","read_after_at now returns public IoLogRead { rows, head }. Head is the global prefix maximum of the same shared-lock byte snapshot, including prefixes with malformed JSON, regardless of after/limit. Scanning continues after the output cap without unnecessary JSON parses. All local unit callers migrated.","Added requirement-proximate impl/unit tags for REQ-HAZARD-IOLOG-SEQ-MONOTONIC and repair/retention REQ-IO-EVENT-ADAPTER-LOG coverage."],"scan_cost":"Each healthy append reads and scans O(log bytes), bounded normally by 1250 payload-capped rows, with JSON escaping included in actual disk size. Memory holds that byte snapshot; repair additionally allocates the retained suffix rewrite. Legacy oversized logs require their full scan until repair/retention succeeds. No sidecar/cache, repeated healthy rewrite, or redundant full read was introduced.","new_tests":["a_tail_window_inside_three_byte_utf8_never_resets_the_seq","a_tail_without_a_complete_row_falls_back_to_the_whole_file","reset_blocks_repair_above_the_max_without_changing_payload_bytes","equal_adjacent_seqs_are_repaired","an_internal_reset_is_repaired_even_when_last_exceeds_first","repair_uses_the_global_max_even_when_it_is_outside_the_tail","trimming_1251_reset_rows_keeps_the_newest_1000_by_position","oversized_repair_retains_bounded_newest_history","sequence_exhaustion_refuses_without_modifying_history","healthy_sequence_gaps_do_not_trigger_repair_or_retention","a_poll_reports_the_true_snapshot_head_independent_of_selected_rows"],"retained_tests":["appends_assign_monotonic_seqs_from_one","the_log_trims_oldest_first_at_the_bound (including last_seq_at never rewinding across trim)","All other existing module tests, migrated to IoLogRead.rows."],"mutation_points":["Restore last_seq_at read_to_string/InvalidData -> 0: the deterministic UTF-8 test directly asserts last_seq_at == 32 before append == 33, so the independent append integrity scan cannot mask the regression.","Replace tail max with last prefix: reset_blocks_repair_above_the_max_without_changing_payload_bytes expects last_seq_at == 203 for [201,202,203,1,2,3].","Replace adjacent <= with <: equal_adjacent_seqs_are_repaired fails.","Use last < first as the integrity check: an_internal_reset_is_repaired_even_when_last_exceeds_first fails on [1,2,1,3].","Use tail-only or retained-suffix-only maximum: repair_uses_the_global_max_even_when_it_is_outside_the_tail and oversized_repair_retains_bounded_newest_history fail respectively.","Reserialize or reorder retained payloads: exact byte comparisons in repair regressions fail.","Restore seq-distance counting/value-filter trimming: healthy_sequence_gaps_do_not_trigger_repair_or_retention and trimming_1251_reset_rows_keeps_the_newest_1000_by_position fail. The latter includes a value-filter negative control that loses 999 newest rows.","Saturate/wrap sequences or commit repair before checking new-row capacity: sequence_exhaustion_refuses_without_modifying_history fails.","Stop scanning at limit, derive head from selected rows/after, or ignore malformed-JSON prefixes: a_poll_reports_the_true_snapshot_head_independent_of_selected_rows fails."],"jit_semantics":["JIT B/C's suggested first/last comparison cannot establish monotonicity. The assignment's stronger requirement needs the full adjacent-prefix scan on every append absent persistent state; implemented explicitly.","The JIT mutation claim that restoring read_to_string necessarily makes append mint 1 no longer holds after the independent full integrity scan. The direct last_seq_at mechanism assertion intentionally catches that mutation; parent should describe this distinction in mutation evidence.","No runtime verification or mutation runs performed; parent gate owns 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integration points**"}],"metadata":{"turn_id":"05ad431a-fba1-4c41-bd99-af1b9e26853e"}},{"id":"fc_0a8f6f40d1e69e19016a9d59b72e7087d2ad1c4d719de448ac","type":"function_call","status":"completed","arguments":"{\"data\":{\"file\":\"C:/Users/decid/Documents/projects/spt-core/.worktrees/iolog-277/crates/spt-store/src/iolog.rs\",\"status\":\"Source and regressions implemented; no validation or formatting commands run, as assigned.\",\"design\":[\"last_seq_at reads bytes, discards the fragment through its first LF before lossy decoding, returns the maximum complete-row prefix in the window, and falls back to whole-file bytes if no complete row remains (including a giant LF-terminated row).\",\"Append performs one whole-file byte read under the existing exclusive stable lock. Its single integrity scan collects physical-line count, global maximum, and any adjacent non-increase (<=), including duplicates and internal resets. Healthy appends do not rewrite history.\",\"Damaged logs retain file-order history using normal last-N retention, then renumber retained keyed rows above the pre-repair global maximum without changing JSON payload bytes. Oversized history retains the newest 1000 rows before repair. Unkeyed corrupt lines remain unchanged and count toward retention.\",\"All repair increments and the appended sequence use checked_add. Repair and new-row serialization are preflighted before any mutation, so exhaustion refuses without modifying history.\",\"Trim uses physical-line positions and retains the newest 1000 only above 1250. It reuses the append scan's bytes rather than rereading the file; ordinary post-append trim remains best-effort.\",\"read_after_at now returns public IoLogRead { rows, head }. Head is the global prefix maximum of the same shared-lock byte snapshot, including prefixes with malformed JSON, regardless of after/limit. Scanning continues after the output cap without unnecessary JSON parses. All local unit callers migrated.\",\"Added requirement-proximate impl/unit tags for REQ-HAZARD-IOLOG-SEQ-MONOTONIC and repair/retention REQ-IO-EVENT-ADAPTER-LOG coverage.\"],\"scan_cost\":\"Each healthy append reads and scans O(log bytes), bounded normally by 1250 payload-capped rows, with JSON escaping included in actual disk size. Memory holds that byte snapshot; repair additionally allocates the retained suffix rewrite. Legacy oversized logs require their full scan until repair/retention succeeds. No sidecar/cache, repeated healthy rewrite, or redundant full read was introduced.\",\"new_tests\":[\"a_tail_window_inside_three_byte_utf8_never_resets_the_seq\",\"a_tail_without_a_complete_row_falls_back_to_the_whole_file\",\"reset_blocks_repair_above_the_max_without_changing_payload_bytes\",\"equal_adjacent_seqs_are_repaired\",\"an_internal_reset_is_repaired_even_when_last_exceeds_first\",\"repair_uses_the_global_max_even_when_it_is_outside_the_tail\",\"trimming_1251_reset_rows_keeps_the_newest_1000_by_position\",\"oversized_repair_retains_bounded_newest_history\",\"sequence_exhaustion_refuses_without_modifying_history\",\"healthy_sequence_gaps_do_not_trigger_repair_or_retention\",\"a_poll_reports_the_true_snapshot_head_independent_of_selected_rows\"],\"retained_tests\":[\"appends_assign_monotonic_seqs_from_one\",\"the_log_trims_oldest_first_at_the_bound (including last_seq_at never rewinding across trim)\",\"All other existing module tests, migrated to IoLogRead.rows.\"],\"mutation_points\":[\"Restore last_seq_at read_to_string/InvalidData -> 0: the deterministic UTF-8 test directly asserts last_seq_at == 32 before append == 33, so the independent append integrity scan cannot mask the regression.\",\"Replace tail max with last prefix: reset_blocks_repair_above_the_max_without_changing_payload_bytes expects last_seq_at == 203 for [201,202,203,1,2,3].\",\"Replace adjacent <= with <: equal_adjacent_seqs_are_repaired fails.\",\"Use last < first as the integrity check: an_internal_reset_is_repaired_even_when_last_exceeds_first fails on [1,2,1,3].\",\"Use tail-only or retained-suffix-only maximum: repair_uses_the_global_max_even_when_it_is_outside_the_tail and oversized_repair_retains_bounded_newest_history fail respectively.\",\"Reserialize or reorder retained payloads: exact byte comparisons in repair regressions fail.\",\"Restore seq-distance counting/value-filter trimming: healthy_sequence_gaps_do_not_trigger_repair_or_retention and trimming_1251_reset_rows_keeps_the_newest_1000_by_position fail. The latter includes a value-filter negative control that loses 999 newest rows.\",\"Saturate/wrap sequences or commit repair before checking new-row capacity: sequence_exhaustion_refuses_without_modifying_history fails.\",\"Stop scanning at limit, derive head from selected rows/after, or ignore malformed-JSON prefixes: a_poll_reports_the_true_snapshot_head_independent_of_selected_rows fails.\"],\"jit_semantics\":[\"JIT B/C's suggested first/last comparison cannot establish monotonicity. The assignment's stronger requirement needs the full adjacent-prefix scan on every append absent persistent state; implemented explicitly.\",\"The JIT mutation claim that restoring read_to_string necessarily makes append mint 1 no longer holds after the independent full integrity scan. The direct last_seq_at mechanism assertion intentionally catches that mutation; parent should describe this distinction in mutation evidence.\",\"No runtime verification or mutation runs performed; parent gate owns them.\"]}}","call_id":"call_qIjAsTUREljg9Des82l6iBk2","internal_chat_message_metadata_passthrough":{"create_time":1788696994.620991,"turn_id":"05ad431a-fba1-4c41-bd99-af1b9e26853e"},"name":"yield","metadata":{"turn_id":"05ad431a-fba1-4c41-bd99-af1b9e26853e"}}]},"duration":52362.73119999934,"ttft":3266.5674999998882,"completedAt":1788697046524,"contextSnapshot":{"promptTokens":47359,"nonMessageTokens":16812,"compactionEpoch":0}}}
{"type":"message","id":"5244e0e2","parentId":"0f078f4f","timestamp":"2026-09-06T12:17:26.528Z","message":{"role":"toolResult","toolCallId":"call_qIjAsTUREljg9Des82l6iBk2|fc_0a8f6f40d1e69e19016a9d59b72e7087d2ad1c4d719de448ac","toolName":"yield","content":[{"type":"text","text":"Result submitted."}],"details":{"data":{"file":"C:/Users/decid/Documents/projects/spt-core/.worktrees/iolog-277/crates/spt-store/src/iolog.rs","status":"Source and regressions implemented; no validation or formatting commands run, as assigned.","design":["last_seq_at reads bytes, discards the fragment through its first LF before lossy decoding, returns the maximum complete-row prefix in the window, and falls back to whole-file bytes if no complete row remains (including a giant LF-terminated row).","Append performs one whole-file byte read under the existing exclusive stable lock. Its single integrity scan collects physical-line count, global maximum, and any adjacent non-increase (<=), including duplicates and internal resets. Healthy appends do not rewrite history.","Damaged logs retain file-order history using normal last-N retention, then renumber retained keyed rows above the pre-repair global maximum without changing JSON payload bytes. Oversized history retains the newest 1000 rows before repair. Unkeyed corrupt lines remain unchanged and count toward retention.","All repair increments and the appended sequence use checked_add. Repair and new-row serialization are preflighted before any mutation, so exhaustion refuses without modifying history.","Trim uses physical-line positions and retains the newest 1000 only above 1250. It reuses the append scan's bytes rather than rereading the file; ordinary post-append trim remains best-effort.","read_after_at now returns public IoLogRead { rows, head }. Head is the global prefix maximum of the same shared-lock byte snapshot, including prefixes with malformed JSON, regardless of after/limit. Scanning continues after the output cap without unnecessary JSON parses. All local unit callers migrated.","Added requirement-proximate impl/unit tags for REQ-HAZARD-IOLOG-SEQ-MONOTONIC and repair/retention REQ-IO-EVENT-ADAPTER-LOG coverage."],"scan_cost":"Each healthy append reads and scans O(log bytes), bounded normally by 1250 payload-capped rows, with JSON escaping included in actual disk size. Memory holds that byte snapshot; repair additionally allocates the retained suffix rewrite. Legacy oversized logs require their full scan until repair/retention succeeds. No sidecar/cache, repeated healthy rewrite, or redundant full read was introduced.","new_tests":["a_tail_window_inside_three_byte_utf8_never_resets_the_seq","a_tail_without_a_complete_row_falls_back_to_the_whole_file","reset_blocks_repair_above_the_max_without_changing_payload_bytes","equal_adjacent_seqs_are_repaired","an_internal_reset_is_repaired_even_when_last_exceeds_first","repair_uses_the_global_max_even_when_it_is_outside_the_tail","trimming_1251_reset_rows_keeps_the_newest_1000_by_position","oversized_repair_retains_bounded_newest_history","sequence_exhaustion_refuses_without_modifying_history","healthy_sequence_gaps_do_not_trigger_repair_or_retention","a_poll_reports_the_true_snapshot_head_independent_of_selected_rows"],"retained_tests":["appends_assign_monotonic_seqs_from_one","the_log_trims_oldest_first_at_the_bound (including last_seq_at never rewinding across trim)","All other existing module tests, migrated to IoLogRead.rows."],"mutation_points":["Restore last_seq_at read_to_string/InvalidData -> 0: the deterministic UTF-8 test directly asserts last_seq_at == 32 before append == 33, so the independent append integrity scan cannot mask the regression.","Replace tail max with last prefix: reset_blocks_repair_above_the_max_without_changing_payload_bytes expects last_seq_at == 203 for [201,202,203,1,2,3].","Replace adjacent <= with <: equal_adjacent_seqs_are_repaired fails.","Use last < first as the integrity check: an_internal_reset_is_repaired_even_when_last_exceeds_first fails on [1,2,1,3].","Use tail-only or retained-suffix-only maximum: repair_uses_the_global_max_even_when_it_is_outside_the_tail and oversized_repair_retains_bounded_newest_history fail respectively.","Reserialize or reorder retained payloads: exact byte comparisons in repair regressions fail.","Restore seq-distance counting/value-filter trimming: healthy_sequence_gaps_do_not_trigger_repair_or_retention and trimming_1251_reset_rows_keeps_the_newest_1000_by_position fail. The latter includes a value-filter negative control that loses 999 newest rows.","Saturate/wrap sequences or commit repair before checking new-row capacity: sequence_exhaustion_refuses_without_modifying_history fails.","Stop scanning at limit, derive head from selected rows/after, or ignore malformed-JSON prefixes: a_poll_reports_the_true_snapshot_head_independent_of_selected_rows fails."],"jit_semantics":["JIT B/C's suggested first/last comparison cannot establish monotonicity. The assignment's stronger requirement needs the full adjacent-prefix scan on every append absent persistent state; implemented explicitly.","The JIT mutation claim that restoring read_to_string necessarily makes append mint 1 no longer holds after the independent full integrity scan. The direct last_seq_at mechanism assertion intentionally catches that mutation; parent should describe this distinction in mutation evidence.","No runtime verification or mutation runs performed; parent gate owns them."]},"status":"success"},"isError":false,"timestamp":1788697046527}}
{"type":"custom","customType":"session_exit","data":{"reason":"dispose","kind":"normal","recordedAt":"2026-09-06T12:24:26.565Z"},"id":"82f6d70f","parentId":"5244e0e2","timestamp":"2026-09-06T12:24:26.565Z"}