Register-and-ledger thin lane, three commits on main `b66a9612`, head `88701366` (tree `192498f6`). Two files, +317 -1: `docs/INFRA-REGISTER.md` and `docs/FLAKE-LEDGER.md`. No workflow, no code, no REQ delta; `traceable-reqs check` rc=0; the CI-validated `.github/ci/flake-registry.json` is untouched (consumer census in the third commit body: an entry is an authorization to rerun a red, not a note).

- **IR-85** — the Windows self-hosted box runs its fs-heavy tests 3-4x slower than a week ago; rider 6's cap raise (`a2f335f8`, golden 50→80, ci unit 25→40) is visibility, not repair. Absorbs doyle's slowdown/wall draft and IR-NEXT. Remedy arm 1 (discriminator lane, interleaved A/B) is running now.
- **IR-86..89** — doyle's 09-08 drafts renumbered from the dead IR-79..82 (taken by other subjects on main): golden start floor below the measured 67.4 GiB footprint; two-host halves are independent jobs on two runners; `pool-release` via `cargo run` regrows the pool it releases (positive control added); Windows firewall drops cold inbound to test exes (box half applied 2026-09-08, workflow half open at `d882297f`).
- **FLAKE-LEDGER** — four rows from the #272 r2/r3 arc plus resident_service_e2e updated in place to a fourth occurrence, naming both assert positions.

Reviewed by doyle from the lane worktree (two required edits applied before push: two stale IR-82 tokens in IR-85 → IR-89; IR-89 status/ripe-when brought current). Lands ff-only on thin CI green (PR #200/#206 precedent).

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https://claude.ai/code/session_01PL7KPiGpCSvJMd5E65DKfq