---
name: v0660-arc-in-flight
description: "v0.66.0 SEMAPHORE arc — SHIPPED 2026-08-30, counter 101, tag==main==tested d931dd63; four golden attempts, every red closed at named mechanism, two fixes field-validated predictively"
metadata: 
  node_type: memory
  type: project
  originSessionId: ac91aea9-5148-47cf-80a4-68522dfb21d2
  modified: 2026-08-30T01:46:44.555Z
---

v0.66.0 SEMAPHORE (#242, 6 members) SHIPPED 2026-08-30 ~01:42Z, counter **101**,
tag == main == tested == `d931dd63`, publish verified at source (Latest flipped,
11 assets, counter re-decoded live not carried). FOUR golden attempts, ZERO closed
by rerun-hoping:

- r2 (att.1, e4f52047): Win n1-gate floor red + Linux 4-cell "brain never came up".
- r3 (att.2): floor red DETERMINISTIC (adjacency — reclaim is checkout's own
  `git clean -ffdx`; deployah refuted my bounded-wait spec by measurement, applied
  my own 2026-08-03 floor-after-checkout ruling to the jobs it left literal-first);
  3 of 4 cells recovered warm, activity_link persisted → carved out.
- Mechanism hunt: todlando's BRAIN_PHASE breadcrumbs + doyle kitsubito repro with a
  tempdir harvest loop → **current_exe_hash() = ~10.1s per brain process on idle
  Linux** (440MB debug binary × debug-compiled sha2 ~43MB/s; ~1.5s Windows — the
  platform split). On the ready path, every boot; Phase A boots compound. 30s
  budgets were the defect. Fix 71f82025 (5 sites → 120s + honest message;
  gater-authored under declared deviation, todlando independent review).
- r4 (d931dd63 = e4f52047 + floor fixes + breadcrumbs + budgets): 8/9; cells
  passed at 42-58s — ALL above the old budget, math field-validated. One NEW red:
  LNK1318 xtask.pdb = disk low-water at the job's LAST heavy step (incremental
  candidate retired by its own preservation snapshot; disk confirmed PREDICTIVELY
  by reclaim → attempt 2 green, 65.1GiB→died vs 85.85GB→success, only variable
  the reclaim). 9/9 at ONE sha across two attempts, each job non-vacuous.
- Near-miss banked: name-classified reap would have destroyed todlando's LIVE ir57
  lane (203GB; stale NAME, live checked-out REF) — identity is the ref.
- Open follow-ons: RCA-242-R2-LINUX.md riders (24-site budget population → hertz
  QUEUED; mid-job floor re-read; incremental hygiene; hash-off-ready-path board
  request); #243 residual emitters (332 colon + 6 space cli.rs + main.rs 2);
  IR-17 corrections owed at sweep; ir57 target reap gated on todlando consent;
  asm-241 worktree removal retry (handle-pinned 2026-08-30).
Related: [[v0650-arc-in-flight]], [[exit-status-after-a-truncation-pipe-measures-the-truncator]].