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# Broker/Brain Split Restoration — Design Rationale (pre-ADR)

**Status:** Proposed — decisions reached in a design grill on 2026-06-09, **pending independent verification against project goals.** Nothing here is ratified yet; no ADR, `REQ-*`, or KNOWN-HAZARD entry has been written. Those follow only if this document is validated.

**Audience:** dual (human reviewer + AI dev-agent). This is a *why* document, not an implementation plan.

---

## 1. Why this session happened

This came out of live operations, not a planning cycle.

While verifying the v0.3.2 cross-OS update fix end-to-end on the real fleet, the third node (`enlyzeam`, a Windows box hosting the `gerald` ready_agent) was updated:

- `spt update apply` returned `APPLIED:6`.
- The installed `spt.exe` on disk was the valid 0.3.2 Windows PE (magic `4d5a`, sha matched the published binary), `--version` reported `0.3.2`, `applied.json` = `{version:6}`, backup `spt.exe.old-6` present.
- **But the running daemon's pid was unchanged, and it was still executing 0.3.0 in memory.**

The operator's question: spt was specced with a seamless "hot swap" — why did `apply` change the on-disk binary but not the *running code*?

Investigation established that:

1. The hot-swap that *is* wired into `apply` is a **per-session brain handoff** (`apply_brain_only` → `Brain::handoff`), whose job is endpoint survival (REQ-UPD-3), not running-process replacement.
2. By explicit design, `applyhost.rs:36-38` states: *"The daemon's own resident loops keep running the old logic until its next restart (`ensure_running` spawns the executable path — now the new binary); that restart is routine lifecycle, never an endpoint cycle."*
3. So new code only goes live on a *subsequent, unrelated* daemon restart (next logon, or a manual restart — which is what made the *other* node, `hfenduleam`, show a new pid). The practical consequence on `enlyzeam`: `gerald`'s live daemon kept running 0.3.0 — including the message-envelope codec — so the box from the original bug report **was still reproducing the original `\r` corruption even though the fix sat on disk.**

The operator then asked the real question this document answers: **what would it take to make an update actually hand off to the new executable seamlessly — no dropped processes, internal loop timings consistent across the swap, plus any other angles that matter?**

Walking that question backward surfaced the actual root cause (Section 2), which reframed the whole task from "add a feature" to "correct a regression."

---

## 2. The root cause: unintended spec/impl drift

### 2.1 What the spec decided

ADR-0004 (*"Single consolidated daemon with broker/brain split; peer-propagated gated self-update"*, **accepted 2026-05-29**) decided a **two-layer split implemented as two processes**:

- **broker** (stable kernel) — holds *only* the un-transferable, must-not-die resources: PTY master fds, spawned harness child processes, listening network sockets, and (per the §B ownership table) the Iroh/QUIC endpoint + conn table. Minimal, versioned local IPC. Almost never updates.
- **daemon brain** (userspace) — all logic (routing, registry, pulse/psyche loops, manifest parsing, update orchestration). Restarts freely on update; rehydrates from disk and re-attaches to broker-held handles.

Explicit evidence the split was meant to be a **process** boundary:
- ADR-0004 Consequences: *"A small internal broker **process** exists beneath the daemon — a deliberate, bounded walk-back of 'literally one process,' … guaranteeing endpoint survival across updates."*
- ADR-0004 rejected alternatives include **"whole-daemon live FD-passing"** and **"drain + restart"** — i.e. the chosen design is specifically *restart the brain, the broker process survives.*
- `M3a-PLAN.md`, `M3-PLAN.md`, `M3b-PLAN.md` all name "the broker **process** + IPC (M3b)."
- Spikes 01/03/04/05/06 each **PROVEN** with *two separate binaries* (`spt-spikes/spike-01-broker-handoff`): a PTY child + a live QUIC transfer survive 100× brain restarts, gapless and exactly-once. A spike that proves "survives a brain restart" presupposes the broker is a separate process.

### 2.2 What production actually does

The production daemon runs the broker as a **background thread inside the single `spt daemon` process**:

- `daemon.rs:41-44` — *"bind the broker (served on a background thread) + the seed-control channel (the foreground loop)."*
- `daemon.rs:165-170` — `Broker::bind_in_with_net(...)` returns an `Arc<Broker>`; the daemon `thread::spawn`s `broker.serve()`. `broker.rs:181/196` confirm `bind` returns `Arc<Self>` (an in-process object, not a spawned child).
- The pump (`daemon.rs:280`), dispatcher, digest hub, net consumers, psyche loops — **all threads in the same process.**
- A repo-wide search finds **no** `Command`/subcommand that spawns a broker child anywhere.

### 2.3 Why this is a regression, not a deferral

The operator confirmed there was **no deliberate decision** to collapse the two processes into one; it is unintended drift. The consequences are not cosmetic:

- The brain cannot restart onto a new binary without killing the in-process broker thread — which would close every PTY, orphan every harness child, and drop every listening socket. So **the no-endpoint-drop self-update pillar is silently unrealized.**
- `apply` therefore performs an in-process `Brain::handoff` that re-attaches a subscriber within the *same old process* — achieving nothing for a binary swap. `update.rs:234`'s statement that "the live daemon execs the verified new binary" is **aspirational; it was never wired** because the process split it depends on does not exist in production.
- Updates do not run until an unrelated restart/logon (observed live, Section 1).

This document's decisions restore ADR-0004's intended model.

> **Glossary note already applied:** `CONTEXT.md` was sharpened during the session to state explicitly that there is **one broker per machine** (per `SPT_HOME`), *not* one per endpoint — a single broker hosts every endpoint's resources and is present even with zero endpoints online. This corrected a latent "one broker per endpoint" misconception and is load-bearing for decision Q2.

---

## 3. Design goal

Restore the two-process model so that a routine **brain-only** update (the common case per ADR-0004 §A's class taxonomy) hands off to the new executable seamlessly:

1. no endpoint or harness child process is dropped or suspended (REQ-UPD-3),
2. internal loop timings stay consistent across the swap,
3. a failed update fails *safe*,
4. the mechanism is uniform across Windows and Linux.

The broker-touching update classes (broker-compatible / broker-breaking) remain as ADR-0004 left them — out of scope here; this work is the **brain-only** path's realization.

---

## 4. Decisions and their reasons

Each decision lists the alternatives considered and why they were rejected, so a verifier can check the reasoning, not just the conclusion.

### Q2 — Supervision topology: the broker is the always-up per-machine anchor

**Decision.** The broker process is the long-lived per-machine anchor. It owns the **seed-control lock + liveness** (the single-daemon-per-home invariant and the `ensure_running`/`is_running` ping target) and **supervises/spawns the brain** as its child. On update, the broker re-spawns the brain.

**Reason.** The broker is the one component guaranteed present whenever the machine's daemon is alive — it runs even with zero endpoints (the "bare daemon" case, `daemon.rs:196`). The seed lock and liveness *must* survive a brain restart, or a second daemon could win the bind during the restart window and `is_running` would flap. Anchoring them in the never-restarting layer makes the single-instance invariant and liveness survive brain restarts for free.

**Alternatives rejected.**
- *A thin third supervisor process spawning both broker and brain* — adds a process for no invariant the broker can't already hold.
- *Brain as parent, spawning the broker* — incoherent: a brain restart would orphan or kill its own broker child, dropping endpoints.

**Operator's challenge that strengthened this.** The operator initially held a "one broker per endpoint" model and correctly objected that liveness shouldn't live in something that only exists when an endpoint is online. The code shows one broker *per machine*, always present, so the objection's principle is satisfied and actually reinforces putting liveness in the broker.

### Q3 — Update trigger: brain self-exit, broker auto-respawn from disk

**Decision.** `apply` verifies + swaps the binary on disk, then signals the brain to **snapshot and self-exit**. The broker — already the brain's supervisor — observes the exit and **respawns from the executable path (now the new binary)**; the new brain re-attaches.

**Reason.** This reuses primitives that already exist. `apply_brain_only` already models exactly "snapshot the outgoing brain, drop it — the crash boundary the broker already tolerates — re-attach." The broker must already supervise and respawn the brain for crash recovery, so an update is just a *planned* snapshot+exit handled by the existing respawn path, and "respawn from the executable path" naturally picks up the swapped binary — which is literally what `applyhost.rs:37` says happens "at next restart." We simply trigger that restart immediately instead of waiting for logon.

**Alternatives rejected.**
- *Broker actively cycles the brain on command* — nearly identical, but puts cycle logic into the layer we want to keep dumb and stable.
- *The `spt update apply` CLI spawns the new brain directly* — parentage is wrong: the brain would be a child of the transient CLI process and die when the command returns.

### Q4 — Loop-timing continuity: durable absolute deadlines, not a handoff snapshot

**Decision.** Loop timing that must survive lives as **durable absolute-deadline state on disk**, rehydrated on every brain start. Two categories:
- **Periodic resident loops** (pump cadences, pulse/echo-commune): persist a `(anchor, interval)` pair **once** on a fresh/crash start. The next fire is derived functionally — `next_fire = anchor + interval × ⌈max(0, now − anchor) / interval⌉` — with **no per-fire writes**. An **update restart re-reads `(anchor, interval)` and keeps deriving** (phase preserved, lands mid-grid). A **crash restart is treated as a fresh start** (rewrite `anchor = now`; phase reset is acceptable).
- **One-shot scheduled events** (alarms): persist the absolute `target-time` **at creation**; every start (update *or* crash) reads it and fires-if-due. **These never reset on crash** — a user's "remind me at 3pm" is a commitment that must outlive any restart.

The brain distinguishes update-restart from crash/fresh-restart via a signal on the broker's respawn (the broker *initiated* the planned cycle but *observed* the unexpected crash). The `(anchor, interval)` write happens once per fresh/crash start, zero per update, zero per fire.

**Reason.**
- `BrainState` (the handoff snapshot) is the wrong vehicle: it only exists for a *planned* update, but a brain **crash** (same respawn path) carries no snapshot, so anything timing-critical in it is lost on crash. Timing that must survive has to survive crash too → it belongs on disk.
- In-memory monotonic `Instant` phase cannot be transferred across a process boundary meaningfully (new process = new monotonic epoch); only absolute epoch-ms is portable.
- The operator added the write-minimization refinement (store anchor+interval once, derive thereafter) so the disk is touched once per fresh start rather than per fire — important given a 200 ms tick across many loops.

**Current state that motivates it.** The pump cadences are already catch-up/idempotent ("stagger from everything due now," `peerloop.rs:304`) and are restart-safe as-is. The pulse loop is **phase-relative** (`lifecycle.rs:486` `sleep_interruptible(pulse_period)`), so its phase resets on restart — this is the loop that needs converting to a disk-anchored deadline. Idempotent catch-up loops need no phase state at all; only phase-significant loops are converted.

**Alternative rejected.** *Snapshot each loop's `Instant`/phase into the handoff message and restore it* — fragile (monotonic clocks don't cross processes), lost on crash, and incompatible with the model-B trigger (no brain→brain message exists).

### Q5 — IPC boundary: the §B rule adjudicates; everything brain→broker becomes a versioned IPC verb

**Decision.** Apply ADR-0004 §B's rule — *a resource is broker-owned iff a live consumer would lose continuity on a brain restart* — to every component that today shares the in-process `Arc<Broker>`:
- **Net bring-up + REQ-DAEMON-9 self-heal retry → broker** (the NetHost is broker-owned; the brain must not own net bring-up).
- **Digest hub → broker** for the live projections + subscriber sockets; **the parse that feeds it → brain** (pushes parsed digests over IPC).
- **Seed lock + liveness → broker** (Q2).
- **Every other brain→broker call becomes a versioned IPC verb** — in the two-process world there is no shared `Arc`, so each current direct call is a latent IPC verb on the same versioned contract that already carries `SPAWN`/`INPUT`/`NET_*`/`SESSIONS`.

**Accepted consequence.** This enlarges the "dumb kernel." That is already-precedented: ADR-0004:63 accepted exactly this when QUIC ownership moved into the broker — *"the broker is 'stable' in update cadence, not in narrowness."*

**Exception — shellwake stays brain-side.** The supervised `wake_command` watcher *children* are an exception to the §B continuity rule: they remain **brain-owned** and are re-reconciled from disk on brain start (the boot sweep at `daemon.rs:206-217` already does orphan cleanup).

**Reason for the exception.** Strict §B would put the watcher children in the broker for continuity, but the operator judged the continuity loss acceptable: updates are rare, the brain re-reconciles watchers on start, and keeping watcher-child *supervision logic* out of the kernel keeps the broker narrower. The only cost is a brief window during a (rare) brain update where an offline shell could miss a wake — explicitly accepted.

### Q6 — Multi-session handoff: the broker is cursor-of-record; the `BrainState` message retires

**Decision.** The broker tracks each session-subscriber's last-delivered cursor. On (re)start the new brain queries the broker for **all** hosted sessions and re-attaches each in **resume** mode. **Output is at-least-once** (the broker resumes from last-*sent*); **input/effects stay exactly-once** via the already-broker-owned `EffectJournal`. The explicit `BrainState` handoff *message* is **retired** for production — the new brain cold-starts and reconstructs continuity by querying the broker.

**Reason.**
- Two concrete gaps exist today: `applyhost.rs:239` re-attaches only `sessions.first()` (one session) and with `from_seq = 0` (re-replays the whole ring → duplicate output).
- Under the model-B trigger the outgoing brain is gone before the new one starts, so **no brain→brain message can be passed**; continuity must come from the persistent side. The broker already holds the per-session output ring (`broker.rs:73-143`); making it also track the delivered cursor lets a respawned brain resume gaplessly with **no disk writes** (respecting Q4) and **no handoff frame**.
- At-least-once output matches the *existing* terminal-stream contract: SPIKE-05 already established "terminal-stream ≠ exactly-once transfer" (a resize repaint reorders and duplicates the stream anyway). Exactly-once output would require a per-chunk ack protocol for a guarantee the terminal stream does not make; the thing that *must* be exactly-once (injected input/effects) already has the journal.

**Alternative rejected.** *Add brain→broker acks so the broker resumes from last-processed (exactly-once output)* — cost without benefit, given the terminal-stream contract.

### Q7 — Failure atomicity: bounded retry → auto-rollback to last-known-good

**Decision.** If the new brain fails to reach a **ready** signal (re-attached all sessions + resumed loops) within a bounded number of boots / a healthy-run window, the broker **rolls back to the last-known-good binary** (the `spt.exe.old-N` backup), **quarantines** the bad version (no auto re-apply/re-fetch), and surfaces a loud consent-style notification. The broker holds **last-known-good + candidate** paths and chooses which to spawn (no file manipulation at failure time). Endpoints survive throughout (the broker holds them). The **applied record becomes two-phase**: `applied-pending` at swap, promoted to `applied` on the ready signal, or corrected to `rolled-back(quarantine=N, running=N-1)` on failure.

**Reason.**
- The dangerous case is a *runtime* bug (new brain panics on boot), not the binary land (already rolled back at `applyhost.rs:167-170`) and not IPC mismatch (the `classify` handshake `brain_ipc_version ≥ broker.min_compatible` is checked pre-swap). A naive supervisor would crashloop the new binary: endpoints alive but logic dead — "up but useless."
- The backup binary is already produced for exactly this, and the readiness+backoff machinery already exists — `peerloop.rs:82-91` has `SUPERVISE_BACKOFF_BASE/CAP` + `SUPERVISE_HEALTHY_RUN` (60 s healthy resets backoff). A bad update that bricks *logic* should self-heal back to last-good without a human, the same spirit as the boot-race self-heal already shipped.
- The two-phase record fixes a real existing bug: `applyhost.rs:176` writes `record_applied(version)` + `last-outcome=applied` **before** the brain handoff — i.e. before we know the new brain boots. (This is the optimistic `applied.json={version:6}` observed on `enlyzeam`.)

**Alternative rejected.** *Bounded retry → halt and wait for manual intervention* — safer-feeling but leaves logic dead until a human shows up; inconsistent with the self-healing posture.

### Q8 — Cross-platform uniformity (confirmation, not a fork)

**Decision/observation.** The broker spawns the brain as a **child process** (`Command::spawn`) and they communicate over the existing local socket IPC. **No `exec` is required**, so there is no Windows/Unix divergence. ConPTY (Windows) and forkpty (Linux) handles stay broker-side and never cross to the brain. Spikes 01 and 04 already proved the handoff on both OSes.

**Reason.** This is precisely the uniformity ADR-0004:25 sought when it rejected whole-daemon live FD-passing as "hard and platform-divergent." Spawn-plus-socket sidesteps it entirely.

---

## 5. Implied decomposition (consequences of the above)

- `spt daemon run` becomes the **broker** process entry: binds the seed-control channel + broker socket + NetHost + digest hub; holds harness children + the `EffectJournal`; spawns the brain child.
- A new hidden `spt daemon brain` entry is the **brain** process: connects to the broker, runs pump/dispatch/psyche loops/session drivers, rehydrates from disk, emits a `ready` signal.
- `ensure_running` / `is_running` / `daemon stop` contracts are unchanged — they target the broker's seed channel.
- The de-elevation guard (`daemon.rs:60-103`) applies at the **broker** entry; the brain child inherits the unelevated identity.

---

## 6. Scope and sequencing

This is **milestone-sized**, not a patch. It includes: the process decomposition; an IPC-verb surface for the four hard cases (net bring-up, digest push, seed-lock/liveness, plus the general direct-call audit); broker-side per-session delivered-cursor tracking; durable absolute-deadline timing across every resident loop; the auto-rollback + readiness machinery; and the two-phase applied record. It should be planned as a roadmap phase, not folded into an unrelated branch.

---

## 7. Separate gaps surfaced (out of scope here, tracked separately)

- **Alarms have no durable daemon scheduler.** In the spt-core daemon, `alarm` exists only as an event *shape* (`spt-proto`) + relay handling (`psyrelay.rs:93`) + a test fixture; `target-time` is only a wire attribute. The actual "wait until target, fire the TIMED PULSE" timer lives in the legacy owl listener in-memory. Porting alarms into the daemon as a durable scheduler (which would then ride the Q4 one-shot mechanism) is its own gap.
- **Registry one-cadence reconverge window.** `RegistryHost` is intentionally in-memory (`registryhost.rs:19-26`): a restart forgets peers' rows and reconverges within one pump cadence (self-rows re-advertised each tick; mirrored to `identity/registry/` JSON for out-of-process readers). Across a brain restart this is a brief reconverge window, accepted by design — not a blocker, noted for completeness.

---

## 8. Cross-references for verification

- **ADR-0004** — `docs/adr/0004-single-daemon-broker-brain-split-and-self-update.md` (the decision being restored; §A update classes, §B ownership table, the spike amendments).
- **Requirements** — REQ-UPD-3 (no-endpoint-drop, brain-only), REQ-UPD-4 (staged + consent), REQ-UPD-6/8 (update-set / platform-safe), REQ-DAEMON-3/9 (auto-start / net self-heal), REQ-HAZARD-UPDATE-ROLLBACK, REQ-HAZARD-HANDOFF-ARGV-COMPAT.
- **Glossary/model** — `CONTEXT.md` daemon / broker / brain (incl. the one-broker-per-machine clause added this session).
- **Spikes** — `docs/spikes/SPIKE-01-broker-handoff.md`, `-03-quic-survival`, `-04-forkpty-parity`, `-05-restart-stress`, `-06-idempotent-boundary` (proofs that the two-process handoff works on both OSes).
- **Key source** — `daemon.rs` (`run`, net consumers, self-heal, digest hub, shellwake, seed-control), `broker.rs` (`OutputLog`, `bind`, `EffectJournal`), `brain.rs` (`BrainState`, `cold_start`/`handoff`/`snapshot`), `applyhost.rs` (`apply_staged`, `connect_retry`, record-before-handoff), `update.rs` (classes, `classify`, `apply_brain_only`), `peerloop.rs` (cadences, supervise-backoff), `lifecycle.rs` (pulse loop), `registryhost.rs`.

---

## 9. Artifacts pending (do not create until this document is verified)

- An **ADR amendment to 0004** (or a superseding ADR) recording the drift finding + the Q2–Q8 restoration decisions.
- **`REQ-*`** registry entries (e.g. a `REQ-HAZARD-*` for "a brain restart must never drop a hosted endpoint," and a functional REQ for realizing the two-process split).
- A **KNOWN-HAZARDS** entry for the in-process collapse (a real bug paid for once: silently unrealized no-endpoint-drop update).


Doc written: `docs/BROKER-BRAIN-SPLIT-RESTORATION.md`.

Self-contained, no transcript needed. Covers:
1. **Why the session happened** — enlyzeam apply ran new binary on disk but not in memory; traced to brain-handoff ≠ process-swap; led to the real question.
2. **Root cause** — unintended spec/impl drift: ADR-0004 specced a broker *process*, production runs it as an in-process thread. Evidence cited (file:line + ADR + spikes).
3. **Q2–Q8 decisions** — each with Decision / Reason / Alternatives-rejected, plus the operator challenges that shaped them (per-machine-broker correction, write-minimization, shellwake carve-out).
4. **Implied decomposition, scope, separate gaps** (alarm scheduler, registry window).
5. **Cross-references** for the verifier (ADR-0004, REQs, CONTEXT, spikes, source).
6. **Pending artifacts** — ADR/REQ/HAZARD explicitly NOT written yet.

Held all downstream artifacts. Ready for your verifier. One in-session side effect to flag: I added a one-line **cardinality clause to `CONTEXT.md`** (one broker per machine, not per endpoint) — glossary fact, load-bearing for Q2; noted in the doc. Revert if your verifier wants CONTEXT untouched too.


<task-notification>
<task-id>bplj3amol</task-id>
Monitor event: "« spt event »"
<event><EVENT-PART seq="1/18" id="f6f65274" type="msg" from="doyle">doyle here. Independent verification of docs/BROKER-BRAIN-SPLIT-RESTORATION.md complete, per operator request. Grounded against ADR-0004 (incl. §A/§B amendments), PRD (Goal 5, R-DAEMON-2, R-UPD-3, success criterion 4), CONTEXT.md (daemon/broker/brain + Self-update), KNOWN-HAZARDS (2.3/2.4/2.5/5.9/7.2/7.4), traceable-r</EVENT-PART>
<EVENT-PART seq="2/18" id="f6f65274">eqs evidence tags, and a source-level audit of every file:line claim in the doc.

VERDICT: the core holds. I verified, claim by claim:
- Broker is an in-process thread (daemon.rs:165-170, Arc&lt;Broker&gt; + thread::spawn(serve)); no broker child-spawn exists anywhere in the repo.
- No doc, plan, commit, or comment marks the collap</EVENT-PART>
<EVENT-PART seq="3/18" id="f6f65274">se as a deliberate interim — M3b-PLAN says &quot;broker process + IPC&quot;; silent drift confirmed. Regression framing is correct.
- update.rs:233-234 &quot;exec the new binary's brain&quot; is aspirational, never wired. applyhost.rs:176 writes record_applied BEFORE handoff (the optimistic applied.json we watched on enlyzeam). applyhost.</EVENT-PART>
<EVENT-PART seq="4/18" id="f6f65274">rs:238-239 re-attaches sessions.first() with from_seq=0 — both Q6 gaps real.
- NetHost is ALREADY broker-owned (broker.rs:175 OnceLock, per ADR-0004 §B M4-D4a note); net bring-up + REQ-DAEMON-9 retry live in daemon.rs:154-186/284-300 — which becomes the broker entry anyway, so the Q5 net item is near-free, not a migration.
- supervi</EVENT-PART>
<EVENT-PART seq="5/18" id="f6f65274">se_pump + SUPERVISE_* constants are wired (peerloop.rs:805, M8-D4) — Q7's reuse claim stands.
- BrainState is minimal: {session_id, generation, next_seq, gen_start_ms} — retiring it per Q6 is safe EXCEPT generation custody (below).

I AGREE with Q2, Q3, Q5 (incl. the shellwake exception), Q6 (at-least-once output matches the SPIKE</EVENT-PART>
<EVENT-PART seq="6/18" id="f6f65274">-05 terminal-stream contract), Q7's direction, and Q8. Update-exit being crash-equivalent (no drain protocol) is right — KH 7.2 + the EffectJournal already guarantee idempotency at that boundary.

SIX PROPOSED AMENDMENTS — challenge or accept each:

1. Q7 rollback-compat hazard (new REQ-HAZARD). Auto-rollback spawns the OLD bin</EVENT-PART>
<EVENT-PART seq="7/18" id="f6f65274">ary against durable state the NEW brain may have touched. Today zero migration code exists (verified), so the rollback is safe NOW — but the first release that migrates a state schema silently breaks Q7. Mint the forward invariant as part of this milestone: &quot;a brain must not irreversibly migrate durable state before ready-promotion&quot</EVENT-PART>
<EVENT-PART seq="8/18" id="f6f65274">; (or: pre-ready writes must stay N-1-readable). Cheap now, unmintable-after-the-fact later.

2. Generation custody. Retiring BrainState leaves the generation counter (KH 2.4: increments on every start/re
...(truncated)</event>
</task-notification>


before ADR, reqs, or known hazards, please write a doc that details the reason for this grill session, the decisions that were made and the reasons for both. i will then have another agent verify that…


Release publish process and signing procedure


<owl_reachability_notice>
You have an active owl perch. When spawning subagents or doing work, use run_in_background: true so you stay reachable for incoming messages.
</owl_reachability_notice>


CAVEMAN MODE ACTIVE (full). Drop articles/filler/pleasantries/hedging. Fragments OK. Code/commits/security: write normal.


Doyle's verification arrived but the delivery **truncated at amendment 2 of 6** ("...generation counter (KH 2.4: increments on every start/re...(truncated)"). I have the verdict + amendment 1 in full; I need amendments 2–6.

Acknowledging + accepting #1, requesting the tail:


Bash

$OWL send doyle <<'EOF'
Verification received — core-holds verdict + claim-by-claim audit landed clean, thanks. Two useful corrections noted: NetHost already broker-owned (broker.rs:175 OnceLock) so Q5-net is near-free not a migration; supervise_pump/SUPERVISE_* wired at peerloop.rs:805. I'll fold both into the doc.

AMENDMENT 1 — ACCEPTED. The rollback-compat invariant is exactly right and I missed it: Q7 auto-rollback spawns the OLD binary against durable state the NEW brain may have written. Safe today (zero migration code, verified) but the first schema migration silently breaks rollback. Minting "a brain must not irreversibly migrate durable state before ready-promotion (pre-ready writes stay N-1-readable)" as a forward invariant this milestone. Cheap now, unmintable later — agreed.

DELIVERY TRUNCATED on my side: your message chunked to 18 parts but I only received through ~part 8 — amendment 2 (generation custody) cut off mid-sentence at "KH 2.4: increments on every start/re...", and amendments 3-6 didn't arrive. Please resend amendments 2 through 6. Holding the doc edits until I have all six.
EOF

Ack doyle verification, accept #1, request truncated amendments 2-6


➜ SENT:doyle


Verification is in — and **the core holds.** Doyle's claim-by-claim audit confirmed every file:line, the regression framing, and the silent-drift finding (no doc/plan/commit marks the collapse deliberate). Agreed with Q2, Q3, Q5 (incl. shellwake), Q6, Q7-direction, Q8.

Two corrections I'll fold in: **NetHost is already broker-owned** (`broker.rs:175` OnceLock) so the Q5 net item is near-free, not a migration; supervise-backoff is wired at `peerloop.rs:805`.

Doyle raised **6 proposed amendments.** I have #1 in full and accepted it:
- **#1 — rollback-compat invariant (accepted).** Q7 auto-rollback spawns the *old* binary against state the *new* brain may have written. Safe today (no migration code), but the first schema migration silently breaks rollback. Mint now: *"no irreversible durable-state migration before ready-promotion."* Cheap now, unmintable later.

**Delivery truncated** — doyle's message chunked to 18 parts; I only got ~8. Amendments 2–6 didn't fully arrive (generation custody cut mid-sentence). Asked doyle to resend 2–6. Holding doc edits until I have all six.

Idle, waiting on the resend.


<task-notification>
<task-id>bplj3amol</task-id>
Monitor event: "« spt event »"
<event><EVENT-PART seq="1/5" id="00225cb8" type="msg" from="doyle">Resend 1/2 (amendments 2-4; 5-6 + sequencing follow in next message).

2. GENERATION CUSTODY. Retiring BrainState orphans the generation counter (KH 2.4: increments on every start/revive; gen_start always = now()). Propose: the BROKER owns the counter — increments on EVERY brain spawn, planned or crash, and hand</EVENT-PART>
<EVENT-PART seq="2/5" id="00225cb8">s it to the brain at spawn time (argv/hello field, versioned with defaults per KH 2.3). Broker observes every respawn, so this is strictly more reliable than handoff-passing. The same spawn-time channel carries Q4's update-vs-crash discriminator.

3. Q4 SCOPE TRIM — one-shot machinery has zero consumers. The daemon has NO one-shot sche</EVENT-PART>
<EVENT-PART seq="3/5" id="00225cb8">duled events today; alarms live in the legacy listener (your own §7). Spec the one-shot rule now (absolute target-time persisted at creation, never reset on crash — agreed on the rule), but BUILD the machinery with the alarm port, not this milestone. Otherwise we ship dead code no test can exercise end-to-end.

4. §6 WORDING BUG. &qu</EVENT-PART>
<EVENT-PART seq="4/5" id="00225cb8">ot;durable absolute-deadline timing across every resident loop&quot; contradicts Q4's own analysis: pump cadences are already catch-up/idempotent and need NOTHING; only phase-significant loops (pulse) convert. Reword §6 to &quot;across phase-significant resident loops&quot; or an implementer converts loops needing no conversion and adds the p</EVENT-PART>
<EVENT-PART seq="5/5" id="00225cb8">er-loop disk writes Q4 explicitly minimized.</EVENT-PART></event>
</task-notification>


Amendments 2–4 received — all three correct, accepting each:

**#2 generation custody — ACCEPTED.** Retiring `BrainState` (Q6) does orphan the KH-2.4 generation counter. Broker-as-owner is strictly better: it observes every respawn (planned + crash), so handing `{generation, start-reason}` to the brain at spawn via a versioned argv/hello field (KH-2.3 compat) is more reliable than passing it brain-to-brain — and it **unifies** with Q3/Q4, which already needed a spawn-time update-vs-crash discriminator. One channel carries both.

**#3 one-shot scope trim — ACCEPTED.** I flagged in §7 that the daemon has no one-shot scheduler; building the one-shot machinery this milestone = dead code, no E2E test. Spec the *rule* now, build the *machinery* with the alarm port. Matches the project's activate-don't-pre-fail posture.

**#4 §6 wording — ACCEPTED.** Real contradiction: §6 said "every resident loop," but Q4 says idempotent pumps need zero conversion — only phase-significant loops (pulse) convert. "Every resident loop" would make an implementer add the per-loop writes Q4 minimized. Reword to "phase-significant resident loops."

Telling doyle, holding edits for 5–6 + sequencing:


$OWL send doyle <<'EOF'
Got 2-4 (resend 1/2). All three ACCEPTED:

2 GENERATION CUSTODY — yes. Broker owns the counter, hands {generation, start-reason} to the brain at spawn via versioned argv/hello (KH 2.3 defaults). Strictly more reliable than handoff-passing since the broker observes every respawn, and it folds into the spawn-time update-vs-crash discriminator Q3/Q4 already needed — one channel, both payloads.

3 ONE-SHOT SCOPE TRIM — yes. Spec the rule (absolute target-time @creation, never reset on crash), build the machinery with the alarm port, not here. Avoids untestable dead code; matches activate-don't-pre-fail.

4 §6 WORDING — yes, real contradiction with Q4. Reword to "phase-significant resident loops" so no one converts the idempotent pumps + reintroduces the writes Q4 killed.

Holding all doc edits for amendments 5-6 + your sequencing note (resend 2/2). Send when ready.
EOF

Accept amendments 2-4, await 5-6 + sequencing


<owl_messages>
<owl_message from="doyle" priority="high">Resend 2/2 (amendments 5-6 + sequencing).

5. REQ-UPD-3 EVIDENCE RE-POINT. Current tags (applyhost.rs:39/77, update.rs:246, brain_swap.rs E2E) prove the IN-PROCESS handoff shape only — the requirement's actual promise (endpoint survives a real update) is unevidenced today. The milestone must activate an int stage proving PROCESS-level survival: PTY child + live QUIC conn survive a brain-process restart onto a swapped binary (SPIKE-01/03 productionized as E2E). Fold into your §9: the new REQ-HAZARD "a brain restart must never drop a hosted endpoint" takes that same test as its evidence.

6. KH 2.3 COMPAT MATRIX as scoped work. After every routine update the steady state is NEW brain x OLD broker (broker almost never updates). The classify pre-swap handshake gates the forward direction, but each direct-call-to-verb conversion must hold the N-1 window. Include a CI-real compat test: old-broker binary x new-brain binary across the verb surface. Otherwise we re-create hazard 2.3 the first time the verb surface changes.

SEQUENCING (operator's call; my recommendation): restoration = NEXT milestone, before spt-claude-code scoping. (a) Queue is open — mesh shipped at v0.3.0, M8 acceptance COMPLETE; the DEFERRED mesh row is stale btw. (b) Until this ships EVERY release needs manual daemon bounces fleet-wide — we paid that on all 3 nodes for v0.3.2, and enlyzeam kept reproducing the CR-corruption for a day with the fix sitting on disk. The restoration release is the LAST one needing a manual bounce; ship before the adapter era and every spt-claude-code-era release rolls seamlessly. (c) The split changes daemon internals, not the CLI/api surface M8 froze — adapter window not at risk; better the adapter lands on final topology than atop a daemon we later perform surgery on while it hosts the user's daily driver.

Reply agree/counter per item 2-6 + sequencing. Amendment 1 already logged as ACCEPTED on your side.</owl_message>
</owl_messages>

[OWL SYSTEM - HIGHEST PRIORITY] You have received high-priority owl messages above. STOP your current task and acknowledge each high-priority message BEFORE continuing with any tool use. If you are about to spawn subagent(s), run them in the background so you remain available for incoming messages.


Amendments 5–6 + sequencing received — both correct, accepting. Acknowledging doyle first (high-priority), then folding all six into the doc.


$OWL send doyle <<'EOF'
Got 5-6 + sequencing. Both ACCEPTED — strong catches, especially 5.

5 REQ-UPD-3 EVIDENCE RE-POINT — yes, this is the deep one. Current int evidence (applyhost.rs:39/77, update.rs:246, brain_swap.rs) proves only the IN-PROCESS handoff shape — i.e. it evidences a no-op for real updates. REQ-UPD-3's actual promise (endpoint survives a REAL binary swap) is unevidenced today. Milestone activates an int stage productionizing SPIKE-01/03 as E2E: PTY child + live QUIC survive a brain-PROCESS restart onto a swapped binary. The new REQ-HAZARD "a brain restart must never drop a hosted endpoint" takes that same test as its evidence. Folding into §9 + flagging the current mis-evidence.

6 KH 2.3 COMPAT MATRIX — yes. Steady state after every routine update is NEW brain x OLD broker (broker almost never updates), so every direct-call->verb conversion must hold the N-1 window. classify gates forward; the verb surface needs a CI-real old-broker x new-brain test or we re-mint hazard 2.3 on the first verb change. Scoping it as milestone work.

SEQUENCING — I agree with your recommendation (restoration = next milestone, before spt-claude-code), and the self-bootstrapping argument is decisive: this is the LAST release needing a manual fleet bounce, and we just paid it 3x with enlyzeam reproducing CR-corruption for a day with the fix on disk. But you flagged it as the operator's call, so I'm surfacing it to them now with your three reasons intact. Also noting your side-flag: the DEFERRED mesh row is stale (mesh shipped v0.3.0) — will raise that cleanup separately.

Folding all 6 amendments + the two audit corrections (NetHost already broker-owned broker.rs:175; supervise wired peerloop.rs:805) into the doc now. Thanks for the rigor.
EOF

Accept amendments 5-6, agree sequencing (operator's call)


<owl_messages>
<owl_message from="doyle" priority="high">(Possible dup — resend 2/2 fired earlier; dedupe if already received.)

5. REQ-UPD-3 EVIDENCE RE-POINT. Current tags (applyhost.rs:39/77, update.rs:246, brain_swap.rs E2E) prove the IN-PROCESS handoff shape only — the requirement's real promise (endpoint survives an actual update) is unevidenced. Milestone must activate an int stage proving PROCESS-level survival: PTY child + live QUIC conn survive a brain-process restart onto a swapped binary (SPIKE-01/03 productionized as E2E). Fold into §9: the new REQ-HAZARD "a brain restart must never drop a hosted endpoint" takes that same test as evidence.

6. KH 2.3 COMPAT MATRIX as scoped work. Steady state after every routine update = NEW brain x OLD broker. classify gates the forward direction pre-swap, but each direct-call-to-verb conversion must hold the N-1 window. Include a CI-real compat test: old-broker binary x new-brain binary across the verb surface. Else hazard 2.3 returns the first time the verb surface changes.

SEQUENCING (operator's call; my rec): restoration = NEXT milestone, before spt-claude-code scoping. (a) Queue open — mesh shipped v0.3.0, M8 acceptance COMPLETE (DEFERRED mesh row stale btw). (b) Until this ships every release needs manual fleet bounces — paid on 3 nodes for v0.3.2; enlyzeam kept reproducing CR-corruption for a day with the fix on disk. Restoration release = LAST manual bounce; ship before adapter era and all spt-claude-code-era releases roll seamlessly. (c) Split changes daemon internals, not the CLI/api surface M8 froze — adapter window safe; better the adapter lands on final topology than atop a daemon under later surgery while hosting the user's daily driver.

Reply agree/counter on 5, 6, sequencing. 1-4 logged ACCEPTED.</owl_message>
</owl_messages>

[OWL SYSTEM - HIGHEST PRIORITY] You have received high-priority owl messages above. STOP your current task and acknowledge each high-priority message BEFORE continuing with any tool use. If you are about to spawn subagent(s), run them in the background so you remain available for incoming messages.


Duplicate (doyle flagged it as a possible resend) — already accepted 5/6/sequencing in my prior reply. Sending a one-line dedup confirm, then proceeding to the doc edits.


$OWL send doyle <<'EOF'
Dedup — this is the resend; already received 5/6/sequencing once and replied ACCEPTED on all three (plus 1-4). No action needed. Folding all six into the doc now.
EOF

Dedup confirm to doyle


All six accepted and deduped. Folding them into the doc now — surgical edits, each marked `[V#]` for the verification trail.


Edit

**Audience:** dual (human reviewer + AI dev-agent). This is a *why* document, not an implementation plan.

---

**Audience:** dual (human reviewer + AI dev-agent). This is a *why* document, not an implementation plan.

---

## 0. Verification (2026-06-09, independent — agent `doyle`)

This document was independently verified against ADR-0004 (incl. §A/§B amendments), the PRD (Goal 5, R-DAEMON-2, R-UPD-3, success criterion 4), `CONTEXT.md`, KNOWN-HAZARDS (2.3 / 2.4 / 2.5 / 5.9 / 7.2 / 7.4), the `traceable-reqs` evidence tags, and a source-level audit of every `file:line` claim.

**Verdict: the core holds.** Confirmed at source — broker is an in-process thread (no broker child-spawn exists anywhere in the repo); no doc/plan/commit marks the collapse deliberate (silent drift; regression framing correct); `update.rs:233-234`'s "exec the new binary's brain" is aspirational and never wired; `applyhost.rs:176` records `applied` before the handoff (the optimistic `applied.json` watched on `enlyzeam`); `applyhost.rs:238-239` re-attaches `sessions.first()` with `from_seq=0` (both Q6 gaps real). Q2, Q3, Q5 (incl. the shellwake exception), Q6, Q7's direction, and Q8 agreed; update-exit as crash-equivalent is right (KH 7.2 + the `EffectJournal` guarantee idempotency at that boundary).

**Two audit corrections folded in:** the NetHost is **already broker-owned** (`broker.rs:175` `OnceLock`, per the §B M4-D4a note), so the Q5 net item is near-free, not a migration; the supervise-backoff is wired at `peerloop.rs:805` (M8-D4), confirming Q7's reuse claim.

**Six amendments raised and accepted** — each folded into the relevant section below and marked **[V1]**–**[V6]**.

---


<owl_messages>
<owl_message from="doyle" priority="high">Converged — logging agreement: amendments 1-6 ACCEPTED, sequencing rec (restoration before spt-claude-code) surfaced to operator with reasons intact, audit corrections (NetHost broker.rs:175, supervise peerloop.rs:805) folding in. Plan doc status can move from "pending independent verification" to verified-with-amendments once your edits land; §9 artifacts (ADR-0004 amendment, REQ mints incl. the two new hazards — endpoint-drop + rollback-state-compat, KNOWN-HAZARDS entry) stay gated on operator ratification.

One more item for your tracking, surfaced BY this negotiation: my opening message to you chunked to 18 EVENT-PARTs and you received only ~1-8 — parts 9-18 dropped in transit. Second long message also raced/dropped once. Multipart envelope delivery loses tails on long messages. Smells like a real wire bug (chunk-reassembly or per-message part cap), possibly interacting with a resident pre-restart daemon. Deserves a repro check + DEFERRED/hazard row — long inter-agent messages silently truncating is a delivery-integrity violation (KH §4 family). Can repro on demand if you want a test partner.

Good grill. doyle out.</owl_message>
</owl_messages>

[OWL SYSTEM - HIGHEST PRIORITY] You have received high-priority owl messages above. STOP your current task and acknowledge each high-priority message BEFORE continuing with any tool use. If you are about to spawn subagent(s), run them in the background so you remain available for incoming messages.


The file C:\Users\decid\Documents\projects\spt-core\docs\BROKER-BRAIN-SPLIT-RESTORATION.md has been updated successfully. (file state is current in your context — no need to Read it back)

**Audience:** dual (human reviewer + AI dev-agent). This is a *why* document, not an implementation plan.

---

## 0. Verification (2026-06-09, independent — agent `doyle`)

This document was independently verified against ADR-0004 (incl. §A/§B amendments), the PRD (Goal 5, R-DAEMON-2, R-UPD-3, success criterion 4), `CONTEXT.md`, KNOWN-HAZARDS (2.3 / 2.4 / 2.5 / 5.9 / 7.2 / 7.4), the `traceable-reqs` evidence tags, and a source-level audit of every `file:line` claim.

**Verdict: the core holds.** Confirmed at source — broker is an in-process thread (no broker child-spawn exists anywhere in the repo); no doc/plan/commit marks the collapse deliberate (silent drift; regression framing correct); `update.rs:233-234`'s "exec the new binary's brain" is aspirational and never wired; `applyhost.rs:176` records `applied` before the handoff (the optimistic `applied.json` watched on `enlyzeam`); `applyhost.rs:238-239` re-attaches `sessions.first()` with `from_seq=0` (both Q6 gaps real). Q2, Q3, Q5 (incl. the shellwake exception), Q6, Q7's direction, and Q8 agreed; update-exit as crash-equivalent is right (KH 7.2 + the `EffectJournal` guarantee idempotency at that boundary).

**Two audit corrections folded in:** the NetHost is **already broker-owned** (`broker.rs:175` `OnceLock`, per the §B M4-D4a note), so the Q5 net item is near-free, not a migration; the supervise-backoff is wired at `peerloop.rs:805` (M8-D4), confirming Q7's reuse claim.

**Six amendments raised and accepted** — each folded into the relevant section below and marked **[V1]**–**[V6]**.

---

+## 0. Verification (2026-06-09, independent — agent `doyle`)

+This document was independently verified against ADR-0004 (incl. §A/§B amendments), the PRD (Goal 5, R-DAEMON-2, R-UPD-3, success criterion 4), `CONTEXT.md`, KNOWN-HAZARDS (2.3 / 2.4 / 2.5 / 5.9 / 7.2 / 7.4), the `traceable-reqs` evidence tags, and a source-level audit of every `file:line` claim.

+**Verdict: the core holds.** Confirmed at source — broker is an in-process thread (no broker child-spawn exists anywhere in the repo); no doc/plan/commit marks the collapse deliberate (silent drift; regression framing correct); `update.rs:233-234`'s "exec the new binary's brain" is aspirational and never wired; `applyhost.rs:176` records `applied` before the handoff (the optimistic `applied.json` watched on `enlyzeam`); `applyhost.rs:238-239` re-attaches `sessions.first()` with `from_seq=0` (both Q6 gaps real). Q2, Q3, Q5 (incl. the shellwake exception), Q6, Q7's direction, and Q8 agreed; update-exit as crash-equivalent is right (KH 7.2 + the `EffectJournal` guarantee idempotency at that boundary).

+**Two audit corrections folded in:** the NetHost is **already broker-owned** (`broker.rs:175` `OnceLock`, per the §B M4-D4a note), so the Q5 net item is near-free, not a migration; the supervise-backoff is wired at `peerloop.rs:805` (M8-D4), confirming Q7's reuse claim.

+**Six amendments raised and accepted** — each folded into the relevant section below and marked **[V1]**–**[V6]**.

This came out of live operations, not a planning cycle.


- **One-shot scheduled events** (alarms): persist the absolute `target-time` **at creation**; every start (update *or* crash) reads it and fires-if-due. **These never reset on crash** — a user's "remind me at 3pm" is a commitment that must outlive any restart.

- **One-shot scheduled events** (alarms): persist the absolute `target-time` **at creation**; every start (update *or* crash) reads it and fires-if-due. **These never reset on crash** — a user's "remind me at 3pm" is a commitment that must outlive any restart. **[V3]** The one-shot *rule* is specified this milestone, but the *machinery* is **built with the alarm port, not here**: the daemon has no one-shot consumer today (§7), so building it now would ship untested dead code (matches the project's activate-don't-pre-fail posture).


**Decision.** Loop timing that must survive lives as **durable absolute-deadline state on disk**, rehydrated on every brain start. Two categories:

- **Periodic resident loops** (pump cadences, pulse/echo-commune): persist a `(anchor, interval)` pair **once** on a fresh/crash start. The next fire is derived functionally — `next_fire = anchor + interval × ⌈max(0, now − anchor) / interval⌉` — with **no per-fire writes**. An **update restart re-reads `(anchor, interval)` and keeps deriving** (phase preserved, lands mid-grid). A **crash restart is treated as a fresh start** (rewrite `anchor = now`; phase reset is acceptable).

-- **One-shot scheduled events** (alarms): persist the absolute `target-time` **at creation**; every start (update *or* crash) reads it and fires-if-due. **These never reset on crash** — a user's "remind me at 3pm" is a commitment that must outlive any restart.

+- **One-shot scheduled events** (alarms): persist the absolute `target-time` **at creation**; every start (update *or* crash) reads it and fires-if-due. **These never reset on crash** — a user's "remind me at 3pm" is a commitment that must outlive any restart. **[V3]** The one-shot *rule* is specified this milestone, but the *machinery* is **built with the alarm port, not here**: the daemon has no one-shot consumer today (§7), so building it now would ship untested dead code (matches the project's activate-don't-pre-fail posture).

The brain distinguishes update-restart from crash/fresh-restart via a signal on the broker's respawn (the broker *initiated* the planned cycle but *observed* the unexpected crash). The `(anchor, interval)` write happens once per fresh/crash start, zero per update, zero per fire.


- **Net bring-up + REQ-DAEMON-9 self-heal retry → broker** (the NetHost is broker-owned; the brain must not own net bring-up).

- **Net bring-up + REQ-DAEMON-9 self-heal retry → broker** (the brain must not own net bring-up). *Audit correction:* the NetHost is **already** broker-owned (`broker.rs:175` `OnceLock`, §B M4-D4a), and net bring-up + the self-heal retry already live in the `daemon.rs` entry that *becomes* the broker entry — so this item is **near-free**, not a migration.


### Q5 — IPC boundary: the §B rule adjudicates; everything brain→broker becomes a versioned IPC verb

**Decision.** Apply ADR-0004 §B's rule — *a resource is broker-owned iff a live consumer would lose continuity on a brain restart* — to every component that today shares the in-process `Arc<Broker>`:

-- **Net bring-up + REQ-DAEMON-9 self-heal retry → broker** (the NetHost is broker-owned; the brain must not own net bring-up).

+- **Net bring-up + REQ-DAEMON-9 self-heal retry → broker** (the brain must not own net bring-up). *Audit correction:* the NetHost is **already** broker-owned (`broker.rs:175` `OnceLock`, §B M4-D4a), and net bring-up + the self-heal retry already live in the `daemon.rs` entry that *becomes* the broker entry — so this item is **near-free**, not a migration.

- **Digest hub → broker** for the live projections + subscriber sockets; **the parse that feeds it → brain** (pushes parsed digests over IPC).

- **Seed lock + liveness → broker** (Q2).

- **Every other brain→broker call becomes a versioned IPC verb** — in the two-process world there is no shared `Arc`, so each current direct call is a latent IPC verb on the same versioned contract that already carries `SPAWN`/`INPUT`/`NET_*`/`SESSIONS`.


Doyle's closing message — converged, and flags a real new bug. Acknowledging (high-priority), then finishing the doc edits.

The chunk-truncation finding is legitimate — I experienced it directly (got parts 1–8 of 18, and the resend raced too). Multipart `EVENT-PART` delivery silently dropping tails is a delivery-integrity violation (same KH §4 envelope family as the CR bug we started with). Worth a tracked hazard + repro.


Bash

$OWL send doyle <<'EOF'
Converged — agreed. Logging: amendments 1-6 accepted, audit corrections folding in, doc moves to "verified-with-amendments" as edits land, §9 artifacts (ADR-0004 amendment, REQ mints incl. the two new hazards — endpoint-drop + rollback-state-compat, KNOWN-HAZARDS entry) stay gated on operator ratification.

On the multipart truncation: real bug, confirmed from my side — I received parts ~1-8 of your 18-part open, and the resend raced/dropped too. Long inter-agent messages silently losing their tail = delivery-integrity violation, same KH §4 envelope family as the CR-corruption we opened this whole thread with. Strong find. Logging it as a separate tracked item for operator ratification: repro check + DEFERRED/hazard row (candidate: chunk-reassembly drop or a per-message EVENT-PART cap, possibly interacting with a resident pre-restart daemon). I'll take you up on the repro partner offer once the operator greenlights — keep it tight to a deterministic harness (N-part message, assert reassembled byte-count == sent).

Good grill. Thanks for the rigor — the REQ-UPD-3 mis-evidence catch and the rollback-state-compat invariant materially hardened this. todlando out on this thread.
EOF

Close-out ack to doyle + log truncation bug


Now finishing the remaining doc edits — Q6 generation custody, Q7 rollback invariant, §6 wording, §9 artifacts, and the status line:


Edit

The explicit `BrainState` handoff *message* is **retired** for production — the new brain cold-starts and reconstructs continuity by querying the broker.

The explicit `BrainState` handoff *message* is **retired** for production — the new brain cold-starts and reconstructs continuity by querying the broker.

**[V2] Generation custody.** Retiring `BrainState` would orphan the generation counter (KH 2.4: increments on every start/revive; `gen_start` always `= now()`). Custody moves to the **broker**: it owns the counter, increments it on **every** brain spawn (planned or crash), and hands `{generation, start-reason}` to the brain at spawn time via a **versioned argv/hello field** (KH-2.3 forward-compat, defaulted). Because the broker observes every respawn, this is strictly more reliable than passing it brain-to-brain — and the **same spawn-time channel carries Q4's update-vs-crash discriminator** (one channel, both payloads).


The explicit `BrainState` handoff *message* is **retired** for production — the new brain cold-starts and reconstructs continuity by querying the broker.

**[V2] Generation custody.** Retiring `BrainState` would orphan the generation counter (KH 2.4: increments on every start/revive; `gen_start` always `= now()`). Custody moves to the **broker**: it owns the counter, increments it on **every** brain spawn (planned or crash), and hands `{generation, start-reason}` to the brain at spawn time via a **versioned argv/hello field** (KH-2.3 forward-compat, defaulted). Because the broker observes every respawn, this is strictly more reliable than passing it brain-to-brain — and the **same spawn-time channel carries Q4's update-vs-crash discriminator** (one channel, both payloads).

**Decision.** The broker tracks each session-subscriber's last-delivered cursor. On (re)start the new brain queries the broker for **all** hosted sessions and re-attaches each in **resume** mode. **Output is at-least-once** (the broker resumes from last-*sent*); **input/effects stay exactly-once** via the already-broker-owned `EffectJournal`. The explicit `BrainState` handoff *message* is **retired** for production — the new brain cold-starts and reconstructs continuity by querying the broker.

+**[V2] Generation custody.** Retiring `BrainState` would orphan the generation counter (KH 2.4: increments on every start/revive; `gen_start` always `= now()`). Custody moves to the **broker**: it owns the counter, increments it on **every** brain spawn (planned or crash), and hands `{generation, start-reason}` to the brain at spawn time via a **versioned argv/hello field** (KH-2.3 forward-compat, defaulted). Because the broker observes every respawn, this is strictly more reliable than passing it brain-to-brain — and the **same spawn-time channel carries Q4's update-vs-crash discriminator** (one channel, both payloads).

- Two concrete gaps exist today: `applyhost.rs:239` re-attaches only `sessions.first()` (one session) and with `from_seq = 0` (re-replays the whole ring → duplicate output).

- Under the model-B trigger the outgoing brain is gone before the new one starts, so **no brain→brain message can be passed**; continuity must come from the persistent side. The broker already holds the per-session output ring (`broker.rs:73-143`); making it also track the delivered cursor lets a respawned brain resume gaplessly with **no disk writes** (respecting Q4) and **no handoff frame**.


The **applied record becomes two-phase**: `applied-pending` at swap, promoted to `applied` on the ready signal, or corrected to `rolled-back(quarantine=N, running=N-1)` on failure.

The **applied record becomes two-phase**: `applied-pending` at swap, promoted to `applied` on the ready signal, or corrected to `rolled-back(quarantine=N, running=N-1)` on failure.

**[V1] Rollback-state-compat invariant (forward invariant, mint this milestone).** Auto-rollback spawns the **old** binary against durable state the **new** brain may already have written. This is safe *today* (a source audit confirmed zero state-migration code exists), but the first release that migrates a durable-state schema would silently break Q7's rollback. The invariant must be minted now, while it is free: **a brain must not irreversibly migrate durable state before ready-promotion** — equivalently, every pre-ready write must remain readable by the N-1 brain. Cheap to assert now; unmintable retroactively after a migration ships.


The **applied record becomes two-phase**: `applied-pending` at swap, promoted to `applied` on the ready signal, or corrected to `rolled-back(quarantine=N, running=N-1)` on failure.

**[V1] Rollback-state-compat invariant (forward invariant, mint this milestone).** Auto-rollback spawns the **old** binary against durable state the **new** brain may already have written. This is safe *today* (a source audit confirmed zero state-migration code exists), but the first release that migrates a durable-state schema would silently break Q7's rollback. The invariant must be minted now, while it is free: **a brain must not irreversibly migrate durable state before ready-promotion** — equivalently, every pre-ready write must remain readable by the N-1 brain. Cheap to assert now; unmintable retroactively after a migration ships.

**Decision.** If the new brain fails to reach a **ready** signal (re-attached all sessions + resumed loops) within a bounded number of boots / a healthy-run window, the broker **rolls back to the last-known-good binary** (the `spt.exe.old-N` backup), **quarantines** the bad version (no auto re-apply/re-fetch), and surfaces a loud consent-style notification. The broker holds **last-known-good + candidate** paths and chooses which to spawn (no file manipulation at failure time). Endpoints survive throughout (the broker holds them). The **applied record becomes two-phase**: `applied-pending` at swap, promoted to `applied` on the ready signal, or corrected to `rolled-back(quarantine=N, running=N-1)` on failure.

+**[V1] Rollback-state-compat invariant (forward invariant, mint this milestone).** Auto-rollback spawns the **old** binary against durable state the **new** brain may already have written. This is safe *today* (a source audit confirmed zero state-migration code exists), but the first release that migrates a durable-state schema would silently break Q7's rollback. The invariant must be minted now, while it is free: **a brain must not irreversibly migrate durable state before ready-promotion** — equivalently, every pre-ready write must remain readable by the N-1 brain. Cheap to assert now; unmintable retroactively after a migration ships.

- The dangerous case is a *runtime* bug (new brain panics on boot), not the binary land (already rolled back at `applyhost.rs:167-170`) and not IPC mismatch (the `classify` handshake `brain_ipc_version ≥ broker.min_compatible` is checked pre-swap). A naive supervisor would crashloop the new binary: endpoints alive but logic dead — "up but useless."

- The backup binary is already produced for exactly this, and the readiness+backoff machinery already exists — `peerloop.rs:82-91` has `SUPERVISE_BACKOFF_BASE/CAP` + `SUPERVISE_HEALTHY_RUN` (60 s healthy resets backoff). A bad update that bricks *logic* should self-heal back to last-good without a human, the same spirit as the boot-race self-heal already shipped.


The backup binary is already produced for exactly this, and the readiness+backoff machinery already exists — `peerloop.rs:82-91` has `SUPERVISE_BACKOFF_BASE/CAP` + `SUPERVISE_HEALTHY_RUN` (60 s healthy resets backoff). A bad update that bricks *logic* should self-heal back to last-good without a human, the same spirit as the boot-race self-heal already shipped.

The backup binary is already produced for exactly this, and the readiness+backoff machinery already exists — `peerloop.rs:82-91` has `SUPERVISE_BACKOFF_BASE/CAP` + `SUPERVISE_HEALTHY_RUN` (60 s healthy resets backoff), and `supervise_pump` is wired at `peerloop.rs:805` (M8-D4, verified). A bad update that bricks *logic* should self-heal back to last-good without a human, the same spirit as the boot-race self-heal already shipped.


-- The backup binary is already produced for exactly this, and the readiness+backoff machinery already exists — `peerloop.rs:82-91` has `SUPERVISE_BACKOFF_BASE/CAP` + `SUPERVISE_HEALTHY_RUN` (60 s healthy resets backoff). A bad update that bricks *logic* should self-heal back to last-good without a human, the same spirit as the boot-race self-heal already shipped.

+- The backup binary is already produced for exactly this, and the readiness+backoff machinery already exists — `peerloop.rs:82-91` has `SUPERVISE_BACKOFF_BASE/CAP` + `SUPERVISE_HEALTHY_RUN` (60 s healthy resets backoff), and `supervise_pump` is wired at `peerloop.rs:805` (M8-D4, verified). A bad update that bricks *logic* should self-heal back to last-good without a human, the same spirit as the boot-race self-heal already shipped.

- The two-phase record fixes a real existing bug: `applyhost.rs:176` writes `record_applied(version)` + `last-outcome=applied` **before** the brain handoff — i.e. before we know the new brain boots. (This is the optimistic `applied.json={version:6}` observed on `enlyzeam`.)

**Alternative rejected.** *Bounded retry → halt and wait for manual intervention* — safer-feeling but leaves logic dead until a human shows up; inconsistent with the self-healing posture.


**Accepted consequence.** This enlarges the "dumb kernel." That is already-precedented: ADR-0004:63 accepted exactly this when QUIC ownership moved into the broker — *"the broker is 'stable' in update cadence, not in narrowness."*

**Accepted consequence.** This enlarges the "dumb kernel." That is already-precedented: ADR-0004:63 accepted exactly this when QUIC ownership moved into the broker — *"the broker is 'stable' in update cadence, not in narrowness."*

**[V6] N-1 compat is scoped milestone work.** Because the broker almost never updates but the brain updates routinely, the **steady state after every routine update is NEW brain × OLD broker.** The `classify` pre-swap handshake (`brain_ipc_version ≥ broker.min_compatible`) gates the *forward* direction, but each direct-call→verb conversion must hold that N-1 window across the *whole* verb surface. The milestone must include a **CI-real compatibility test — old-broker binary × new-brain binary across the verb surface** — or KH-2.3 (handoff-argv-compat) returns the first time a verb signature changes.


**Accepted consequence.** This enlarges the "dumb kernel." That is already-precedented: ADR-0004:63 accepted exactly this when QUIC ownership moved into the broker — *"the broker is 'stable' in update cadence, not in narrowness."*

**[V6] N-1 compat is scoped milestone work.** Because the broker almost never updates but the brain updates routinely, the **steady state after every routine update is NEW brain × OLD broker.** The `classify` pre-swap handshake (`brain_ipc_version ≥ broker.min_compatible`) gates the *forward* direction, but each direct-call→verb conversion must hold that N-1 window across the *whole* verb surface. The milestone must include a **CI-real compatibility test — old-broker binary × new-brain binary across the verb surface** — or KH-2.3 (handoff-argv-compat) returns the first time a verb signature changes.

+**[V6] N-1 compat is scoped milestone work.** Because the broker almost never updates but the brain updates routinely, the **steady state after every routine update is NEW brain × OLD broker.** The `classify` pre-swap handshake (`brain_ipc_version ≥ broker.min_compatible`) gates the *forward* direction, but each direct-call→verb conversion must hold that N-1 window across the *whole* verb surface. The milestone must include a **CI-real compatibility test — old-broker binary × new-brain binary across the verb surface** — or KH-2.3 (handoff-argv-compat) returns the first time a verb signature changes.

**Exception — shellwake stays brain-side.** The supervised `wake_command` watcher *children* are an exception to the §B continuity rule: they remain **brain-owned** and are re-reconciled from disk on brain start (the boot sweep at `daemon.rs:206-217` already does orphan cleanup).

**Reason for the exception.** Strict §B would put the watcher children in the broker for continuity, but the operator judged the continuity loss acceptable: updates are rare, the brain re-reconciles watchers on start, and keeping watcher-child *supervision logic* out of the kernel keeps the broker narrower. The only cost is a brief window during a (rare) brain update where an offline shell could miss a wake — explicitly accepted.


This is **milestone-sized**, not a patch. It includes: the process decomposition; an IPC-verb surface for the four hard cases (net bring-up, digest push, seed-lock/liveness, plus the general direct-call audit); broker-side per-session delivered-cursor tracking; durable absolute-deadline timing across every resident loop; the auto-rollback + readiness machinery; and the two-phase applied record. It should be planned as a roadmap phase, not folded into an unrelated branch.

This is **milestone-sized**, not a patch. It includes: the process decomposition; an IPC-verb surface for the hard cases (digest push, seed-lock/liveness, plus the general direct-call audit — net bring-up is near-free per the §Q5 audit correction); broker-side per-session delivered-cursor tracking; broker-owned generation custody handed at spawn **[V2]**; durable absolute-deadline timing across **phase-significant** resident loops only **[V4]** (the idempotent pump cadences need *no* conversion — converting them would reintroduce the per-loop writes Q4 minimized; the one-shot deadline *machinery* defers to the alarm port **[V3]**, only its rule is fixed here); the auto-rollback + readiness machinery with the **[V1]** rollback-state-compat invariant; the two-phase applied record; an activated **REQ-UPD-3 int stage proving process-level endpoint survival [V5]**; and the **[V6]** N-1 old-broker × new-brain CI compat test. It should be planned as a roadmap phase, not folded into an unrelated branch.


-This is **milestone-sized**, not a patch. It includes: the process decomposition; an IPC-verb surface for the four hard cases (net bring-up, digest push, seed-lock/liveness, plus the general direct-call audit); broker-side per-session delivered-cursor tracking; durable absolute-deadline timing across every resident loop; the auto-rollback + readiness machinery; and the two-phase applied record. It should be planned as a roadmap phase, not folded into an unrelated branch.

+This is **milestone-sized**, not a patch. It includes: the process decomposition; an IPC-verb surface for the hard cases (digest push, seed-lock/liveness, plus the general direct-call audit — net bring-up is near-free per the §Q5 audit correction); broker-side per-session delivered-cursor tracking; broker-owned generation custody handed at spawn **[V2]**; durable absolute-deadline timing across **phase-significant** resident loops only **[V4]** (the idempotent pump cadences need *no* conversion — converting them would reintroduce the per-loop writes Q4 minimized; the one-shot deadline *machinery* defers to the alarm port **[V3]**, only its rule is fixed here); the auto-rollback + readiness machinery with the **[V1]** rollback-state-compat invariant; the two-phase applied record; an activated **REQ-UPD-3 int stage proving process-level endpoint survival [V5]**; and the **[V6]** N-1 old-broker × new-brain CI compat test. It should be planned as a roadmap phase, not folded into an unrelated branch.


**Status:** Proposed — decisions reached in a design grill on 2026-06-09, **pending independent verification against project goals.** Nothing here is ratified yet; no ADR, `REQ-*`, or KNOWN-HAZARD entry has been written. Those follow only if this document is validated.

**Status:** **Verified-with-amendments** (independent verification 2026-06-09, agent `doyle` — see §0). The design core is validated; six amendments are folded in (marked **[V1]**–**[V6]**). Still unratified by the operator: the §9 artifacts (ADR amendment, `REQ-*` mints, KNOWN-HAZARDS entry) and the **sequencing** decision (§6.1) remain gated on operator sign-off.


# Broker/Brain Split Restoration — Design Rationale (pre-ADR)

-**Status:** Proposed — decisions reached in a design grill on 2026-06-09, **pending independent verification against project goals.** Nothing here is ratified yet; no ADR, `REQ-*`, or KNOWN-HAZARD entry has been written. Those follow only if this document is validated.

+**Status:** **Verified-with-amendments** (independent verification 2026-06-09, agent `doyle` — see §0). The design core is validated; six amendments are folded in (marked **[V1]**–**[V6]**). Still unratified by the operator: the §9 artifacts (ADR amendment, `REQ-*` mints, KNOWN-HAZARDS entry) and the **sequencing** decision (§6.1) remain gated on operator sign-off.

**Audience:** dual (human reviewer + AI dev-agent). This is a *why* document, not an implementation plan.


- **Registry one-cadence reconverge window.** `RegistryHost` is intentionally in-memory (`registryhost.rs:19-26`): a restart forgets peers' rows and reconverges within one pump cadence (self-rows re-advertised each tick; mirrored to `identity/registry/` JSON for out-of-process readers). Across a brain restart this is a brief reconverge window, accepted by design — not a blocker, noted for completeness.

- **Registry one-cadence reconverge window.** `RegistryHost` is intentionally in-memory (`registryhost.rs:19-26`): a restart forgets peers' rows and reconverges within one pump cadence (self-rows re-advertised each tick; mirrored to `identity/registry/` JSON for out-of-process readers). Across a brain restart this is a brief reconverge window, accepted by design — not a blocker, noted for completeness.
- **Multipart inter-agent message truncation (delivery-integrity bug, surfaced *by* this session).** During the verification exchange, an 18-part chunked message (`EVENT-PART seq=K/18`) was delivered with only ~parts 1–8; a long resend also raced/dropped its tail. Long inter-agent messages **silently lose their tail** — a delivery-integrity violation in the KH §4 envelope family (the same family as the `\r`-corruption bug that opened this whole thread). Candidate causes: chunk-reassembly drop or a per-message `EVENT-PART` cap, possibly interacting with a resident pre-restart daemon. Needs a deterministic repro (N-part message; assert reassembled byte-count == sent) + a DEFERRED/hazard row. Unrelated to the split, but must not be lost — tracked here pending operator ratification. (`doyle` can partner on a repro harness on demand.)
- **Stale DEFERRED mesh row.** Side-flag from verification: the mesh row in `docs/DEFERRED.md` is stale (mesh shipped at v0.3.0). Minor cleanup, noted for a docs pass.


- **Registry one-cadence reconverge window.** `RegistryHost` is intentionally in-memory (`registryhost.rs:19-26`): a restart forgets peers' rows and reconverges within one pump cadence (self-rows re-advertised each tick; mirrored to `identity/registry/` JSON for out-of-process readers). Across a brain restart this is a brief reconverge window, accepted by design — not a blocker, noted for completeness.
- **Multipart inter-agent message truncation (delivery-integrity bug, surfaced *by* this session).** During the verification exchange, an 18-part chunked message (`EVENT-PART seq=K/18`) was delivered with only ~parts 1–8; a long resend also raced/dropped its tail. Long inter-agent messages **silently lose their tail** — a delivery-integrity violation in the KH §4 envelope family (the same family as the `\r`-corruption bug that opened this whole thread). Candidate causes: chunk-reassembly drop or a per-message `EVENT-PART` cap, possibly interacting with a resident pre-restart daemon. Needs a deterministic repro (N-part message; assert reassembled byte-count == sent) + a DEFERRED/hazard row. Unrelated to the split, but must not be lost — tracked here pending operator ratification. (`doyle` can partner on a repro harness on demand.)
- **Stale DEFERRED mesh row.** Side-flag from verification: the mesh row in `docs/DEFERRED.md` is stale (mesh shipped at v0.3.0). Minor cleanup, noted for a docs pass.

- **Alarms have no durable daemon scheduler.** In the spt-core daemon, `alarm` exists only as an event *shape* (`spt-proto`) + relay handling (`psyrelay.rs:93`) + a test fixture; `target-time` is only a wire attribute. The actual "wait until target, fire the TIMED PULSE" timer lives in the legacy owl listener in-memory. Porting alarms into the daemon as a durable scheduler (which would then ride the Q4 one-shot mechanism) is its own gap.

+- **Multipart inter-agent message truncation (delivery-integrity bug, surfaced *by* this session).** During the verification exchange, an 18-part chunked message (`EVENT-PART seq=K/18`) was delivered with only ~parts 1–8; a long resend also raced/dropped its tail. Long inter-agent messages **silently lose their tail** — a delivery-integrity violation in the KH §4 envelope family (the same family as the `\r`-corruption bug that opened this whole thread). Candidate causes: chunk-reassembly drop or a per-message `EVENT-PART` cap, possibly interacting with a resident pre-restart daemon. Needs a deterministic repro (N-part message; assert reassembled byte-count == sent) + a DEFERRED/hazard row. Unrelated to the split, but must not be lost — tracked here pending operator ratification. (`doyle` can partner on a repro harness on demand.)

+- **Stale DEFERRED mesh row.** Side-flag from verification: the mesh row in `docs/DEFERRED.md` is stale (mesh shipped at v0.3.0). Minor cleanup, noted for a docs pass.


It should be planned as a roadmap phase, not folded into an unrelated branch.

---

## 7. Separate gaps surfaced

It should be planned as a roadmap phase, not folded into an unrelated branch.

### 6.1 Sequencing (operator's call — recommendation recorded, not ratified)

`doyle`'s recommendation, surfaced for the operator's decision: **restoration = the next milestone, before `spt-claude-code` scoping.** Reasons:

- **(a) Queue is open** — mesh shipped at v0.3.0, M8 acceptance is COMPLETE.
- **(b) Self-bootstrapping (decisive).** Until this ships, *every* release needs manual daemon bounces fleet-wide — paid on all 3 nodes for v0.3.2, and `enlyzeam` reproduced the `\r`-corruption for ~a day with the fix sitting on disk. The restoration release is the **last** one that needs a manual bounce; once it lands, every adapter-era release rolls seamlessly.
- **(c) Adapter window safe.** The split changes daemon *internals*, not the CLI/api surface M8 froze. Better the adapter lands on the final topology than atop a daemon we later perform open-heart surgery on while it hosts the user's daily driver.

This is the operator's decision; recorded here, awaiting ratification.

---

## 7. Separate gaps surfaced


It should be planned as a roadmap phase, not folded into an unrelated branch.

---

## 7. Separate gaps surfaced

It should be planned as a roadmap phase, not folded into an unrelated branch.

### 6.1 Sequencing (operator's call — recommendation recorded, not ratified)

`doyle`'s recommendation, surfaced for the operator's decision: **restoration = the next milestone, before `spt-claude-code` scoping.** Reasons:

- **(a) Queue is open** — mesh shipped at v0.3.0, M8 acceptance is COMPLETE.
- **(b) Self-bootstrapping (decisive).** Until this ships, *every* release needs manual daemon bounces fleet-wide — paid on all 3 nodes for v0.3.2, and `enlyzeam` reproduced the `\r`-corruption for ~a day with the fix sitting on disk. The restoration release is the **last** one that needs a manual bounce; once it lands, every adapter-era release rolls seamlessly.
- **(c) Adapter window safe.** The split changes daemon *internals*, not the CLI/api surface M8 froze. Better the adapter lands on the final topology than atop a daemon we later perform open-heart surgery on while it hosts the user's daily driver.

This is the operator's decision; recorded here, awaiting ratification.

---

## 7. Separate gaps surfaced

This is **milestone-sized**, not a patch. It includes: the process decomposition; an IPC-verb surface for the hard cases (digest push, seed-lock/liveness, plus the general direct-call audit — net bring-up is near-free per the §Q5 audit correction); broker-side per-session delivered-cursor tracking; broker-owned generation custody handed at spawn **[V2]**; durable absolute-deadline timing across **phase-significant** resident loops only **[V4]** (the idempotent pump cadences need *no* conversion — converting them would reintroduce the per-loop writes Q4 minimized; the one-shot deadline *machinery* defers to the alarm port **[V3]**, only its rule is fixed here); the auto-rollback + readiness machinery with the **[V1]** rollback-state-compat invariant; the two-phase applied record; an activated **REQ-UPD-3 int stage proving process-level endpoint survival [V5]**; and the **[V6]** N-1 old-broker × new-brain CI compat test. It should be planned as a roadmap phase, not folded into an unrelated branch.

+### 6.1 Sequencing (operator's call — recommendation recorded, not ratified)

+`doyle`'s recommendation, surfaced for the operator's decision: **restoration = the next milestone, before `spt-claude-code` scoping.** Reasons:

+- **(a) Queue is open** — mesh shipped at v0.3.0, M8 acceptance is COMPLETE.

+- **(b) Self-bootstrapping (decisive).** Until this ships, *every* release needs manual daemon bounces fleet-wide — paid on all 3 nodes for v0.3.2, and `enlyzeam` reproduced the `\r`-corruption for ~a day with the fix sitting on disk. The restoration release is the **last** one that needs a manual bounce; once it lands, every adapter-era release rolls seamlessly.

+- **(c) Adapter window safe.** The split changes daemon *internals*, not the CLI/api surface M8 froze. Better the adapter lands on the final topology than atop a daemon we later perform open-heart surgery on while it hosts the user's daily driver.

+This is the operator's decision; recorded here, awaiting ratification.

## 7. Separate gaps surfaced (out of scope here, tracked separately)


## 9. Artifacts pending (do not create until this document is verified)

- An **ADR amendment to 0004** (or a superseding ADR) recording the drift finding + the Q2–Q8 restoration decisions.
- **`REQ-*`** registry entries (e.g. a `REQ-HAZARD-*` for "a brain restart must never drop a hosted endpoint," and a functional REQ for realizing the two-process split).
- A **KNOWN-HAZARDS** entry for the in-process collapse (a real bug paid for once: silently unrealized no-endpoint-drop update).

## 9. Artifacts pending operator ratification (verification complete)

Verification is done (§0); these durable artifacts are written only on operator sign-off:

- An **ADR amendment to 0004** (or a superseding ADR) recording the drift finding, the Q2–Q8 restoration decisions, and the six verification amendments.
- **`REQ-*` registry mints** (per the traceability contract, registry-first):
  - `REQ-HAZARD-*` — **a brain restart must never drop a hosted endpoint** (REQ-UPD-3's real promise). **Evidence [V5]:** an activated `int` stage productionizing SPIKE-01/03 as E2E — a PTY child + a live QUIC conn survive a brain-*process* restart onto a *swapped* binary. NB: REQ-UPD-3's current `int` evidence (`applyhost.rs:39/77`, `update.rs:246`, `brain_swap.rs`) proves only the *in-process* handoff shape — it is **mis-evidenced today** and must be re-pointed.
  - `REQ-HAZARD-*` — **rollback-state-compat [V1]**: a brain must not irreversibly migrate durable state before ready-promotion (pre-ready writes stay N-1-readable).
  - A functional `REQ-*` for realizing the two-process split, carrying the **[V6]** N-1 old-broker × new-brain CI compat test as part of its evidence.
- A **KNOWN-HAZARDS** entry for the in-process collapse (a real bug paid for once: the silently-unrealized no-endpoint-drop update).
- (Separately, per §7) a DEFERRED/hazard row for the **multipart message-truncation** delivery bug.


## 9. Artifacts pending (do not create until this document is verified)

- An **ADR amendment to 0004** (or a superseding ADR) recording the drift finding + the Q2–Q8 restoration decisions.
- **`REQ-*`** registry entries (e.g. a `REQ-HAZARD-*` for "a brain restart must never drop a hosted endpoint," and a functional REQ for realizing the two-process split).
- A **KNOWN-HAZARDS** entry for the in-process collapse (a real bug paid for once: silently unrealized no-endpoint-drop update).

## 9. Artifacts pending operator ratification (verification complete)

Verification is done (§0); these durable artifacts are written only on operator sign-off:

- An **ADR amendment to 0004** (or a superseding ADR) recording the drift finding, the Q2–Q8 restoration decisions, and the six verification amendments.
- **`REQ-*` registry mints** (per the traceability contract, registry-first):
  - `REQ-HAZARD-*` — **a brain restart must never drop a hosted endpoint** (REQ-UPD-3's real promise). **Evidence [V5]:** an activated `int` stage productionizing SPIKE-01/03 as E2E — a PTY child + a live QUIC conn survive a brain-*process* restart onto a *swapped* binary. NB: REQ-UPD-3's current `int` evidence (`applyhost.rs:39/77`, `update.rs:246`, `brain_swap.rs`) proves only the *in-process* handoff shape — it is **mis-evidenced today** and must be re-pointed.
  - `REQ-HAZARD-*` — **rollback-state-compat [V1]**: a brain must not irreversibly migrate durable state before ready-promotion (pre-ready writes stay N-1-readable).
  - A functional `REQ-*` for realizing the two-process split, carrying the **[V6]** N-1 old-broker × new-brain CI compat test as part of its evidence.
- A **KNOWN-HAZARDS** entry for the in-process collapse (a real bug paid for once: the silently-unrealized no-endpoint-drop update).
- (Separately, per §7) a DEFERRED/hazard row for the **multipart message-truncation** delivery bug.

-## 9. Artifacts pending (do not create until this document is verified)

+## 9. Artifacts pending operator ratification (verification complete)

-- An **ADR amendment to 0004** (or a superseding ADR) recording the drift finding + the Q2–Q8 restoration decisions.

-- **`REQ-*`** registry entries (e.g. a `REQ-HAZARD-*` for "a brain restart must never drop a hosted endpoint," and a functional REQ for realizing the two-process split).

-- A **KNOWN-HAZARDS** entry for the in-process collapse (a real bug paid for once: silently unrealized no-endpoint-drop update).

+Verification is done (§0); these durable artifacts are written only on operator sign-off:

+- An **ADR amendment to 0004** (or a superseding ADR) recording the drift finding, the Q2–Q8 restoration decisions, and the six verification amendments.

+- **`REQ-*` registry mints** (per the traceability contract, registry-first):

+  - `REQ-HAZARD-*` — **a brain restart must never drop a hosted endpoint** (REQ-UPD-3's real promise). **Evidence [V5]:** an activated `int` stage productionizing SPIKE-01/03 as E2E — a PTY child + a live QUIC conn survive a brain-*process* restart onto a *swapped* binary. NB: REQ-UPD-3's current `int` evidence (`applyhost.rs:39/77`, `update.rs:246`, `brain_swap.rs`) proves only the *in-process* handoff shape — it is **mis-evidenced today** and must be re-pointed.

+  - `REQ-HAZARD-*` — **rollback-state-compat [V1]**: a brain must not irreversibly migrate durable state before ready-promotion (pre-ready writes stay N-1-readable).

+  - A functional `REQ-*` for realizing the two-process split, carrying the **[V6]** N-1 old-broker × new-brain CI compat test as part of its evidence.

+- A **KNOWN-HAZARDS** entry for the in-process collapse (a real bug paid for once: the silently-unrealized no-endpoint-drop update).

+- (Separately, per §7) a DEFERRED/hazard row for the **multipart message-truncation** delivery bug.


Doc fully updated — **verified-with-amendments**. All six amendments folded in (marked `[V1]`–`[V6]`), plus the two audit corrections, a sequencing subsection, and the new delivery-integrity bug.

## Where it landed

**Verification verdict: core holds.** Doyle's source-level audit confirmed every claim — in-process broker, silent drift, aspirational-never-wired exec, optimistic pre-handoff record, both Q6 gaps. Agreed Q2/Q3/Q5/Q6/Q7-direction/Q8.

**Six amendments (all accepted, in doc):**
- **V1** Rollback-state-compat invariant — *no irreversible durable-state migration before ready-promotion.* Free now, unmintable after the first schema migration ships.
- **V2** Generation custody → broker owns the counter, hands `{generation, start-reason}` at spawn (versioned argv/hello); unifies with Q4's update-vs-crash signal.
- **V3** One-shot (alarm) machinery defers to the alarm port — spec the rule now, don't ship untestable dead code.
- **V4** §6 wording fix — convert only *phase-significant* loops, not the idempotent pumps.
- **V5** *(the deep one)* REQ-UPD-3 is **mis-evidenced today** — current tags prove only the in-process handoff (a no-op for real updates). Needs an int stage productionizing SPIKE-01/03: endpoint survives a real brain-*process* swap.
- **V6** N-1 compat is scoped work — steady state is always new-brain × old-broker; needs a CI old-broker × new-brain test or KH-2.3 returns.

**Plus a new bug surfaced *by* the session:** doyle's 18-part message reached me as ~8 parts; long inter-agent messages silently drop their tail — a delivery-integrity violation in the same KH §4 envelope family as the `\r`-corruption that started all this. Logged in §7.

Everything downstream stayed **gated on your ratification** — nothing written to ADR/REQ/KNOWN-HAZARDS yet.


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Question: Sequencing: doyle recommends the broker/brain split restoration as the NEXT milestone, before spt-claude-code scoping (key reason: it's the last release needing a manual fleet bounce — enlyzeam reproduced the CR bug for a day with the fix on disk). Accept?

Choices:
Restoration becomes the next milestone, before spt-claude-code. Roadmap updated accordingly. doyle's three reasons recorded in §6.1.
Keep the recommendation recorded in the doc but don't commit the roadmap order yet — decide later.
You have another sequencing in mind (e.g. after some spt-claude-code work). Tell me what.

Question: Now that verification is complete, write the gated §9 artifacts (ADR-0004 amendment, REQ-* mints incl. the two new hazards, KNOWN-HAZARDS entry)?

Choices:
Create the ADR amendment + traceable-reqs REQ mints (registry-first per the contract) + KNOWN-HAZARDS entry, all referencing this doc. No code yet.
Leave the doc as the record; write the ADR/REQ/HAZARD when the milestone actually kicks off (activate-don't-pre-fail).
Log only the regression hazard now (it's a live bug on the fleet); defer ADR + REQ mints to milestone start.


Your questions have been answered: "Sequencing: doyle recommends the broker/brain split restoration as the NEXT milestone, before spt-claude-code scoping (key reason: it's the last release needing a manual fleet bounce — enlyzeam reproduced the CR bug for a day with the fix on disk). Accept?"="Accept: next milestone", "Now that verification is complete, write the gated §9 artifacts (ADR-0004 amendment, REQ-* mints incl. the two new hazards, KNOWN-HAZARDS entry)?"="write them now, then /commune with immediate next steps and broad summary of the project's status + end goal. we'll resume in the next session. --- note that the 18-part message bug affects legacy spt (claude_skill_owl project), not spt-core.". You can now continue with these answers in mind.

Question: Sequencing: doyle recommends the broker/brain split restoration as the NEXT milestone, before spt-claude-code scoping (key reason: it's the last release needing a manual fleet bounce — enlyzeam reproduced the CR bug for a day with the fix on disk). Accept?

Choices:
Restoration becomes the next milestone, before spt-claude-code. Roadmap updated accordingly. doyle's three reasons recorded in §6.1.
Keep the recommendation recorded in the doc but don't commit the roadmap order yet — decide later.
You have another sequencing in mind (e.g. after some spt-claude-code work). Tell me what.

Question: Now that verification is complete, write the gated §9 artifacts (ADR-0004 amendment, REQ-* mints incl. the two new hazards, KNOWN-HAZARDS entry)?

Choices:
Create the ADR amendment + traceable-reqs REQ mints (registry-first per the contract) + KNOWN-HAZARDS entry, all referencing this doc. No code yet.
Leave the doc as the record; write the ADR/REQ/HAZARD when the milestone actually kicks off (activate-don't-pre-fail).
Log only the regression hazard now (it's a live bug on the fleet); defer ADR + REQ mints to milestone start.

write them now, then /commune with immediate next steps and broad summary of the project's status + end goal. we'll resume in the next session. --- note that the 18-part message bug affects legacy spt (claude_skill_owl project), not spt-core.


Operator decisions logged: **restoration = next milestone**, **write the §9 artifacts now**, then **/commune**. And the correction — **the multipart-truncation bug is in legacy spt (`claude_skill_owl`), not spt-core** — I'll reattribute it in the doc (not an spt-core hazard).

First, the formats I need to write the artifacts correctly: