LOCKED — PM-RATIFY-LOCK-SEMANTICS Path L-1

Date: 2026-04-24 Ratified by: Marko Marković (via PM verified evidence) PM: claude-opus-4-7 (Cowork) Prerequisite gate: 1/3 (Task #29 progress)

Odluka

Path L-1 RATIFIED. §7.4 concurrent_runners: FORBIDDEN pokriva cross-process threat model. Intra-wrapper --parallel-concurrency N spawns preko fail-open TOCTOU race. Manifest v4 anchor dedd698 ostaje validan. Code freeze HEAD 373516c nepromenjen. Bez manifest v5 reemisije.

Waiver tekst (authoritative)

§7.4 applies only to cross-process invocations. Intra-wrapper parallel spawns under --parallel-concurrency N are exempt. HEAD 373516c behaviour satisfies the intent.

Evidence verified

runner-lock.ts:77-112 check-then-write pattern confirmed. TOCTOU prozor između readExistingLock i fs.writeFileSync.
runner.ts:67-72 + 848-851 intent explicitly cross-process ("sentinel contend regardless of their --output paths")
Gate D halt log: pid 4984 + pid 65668 oba logovali [bench:lock] acquired unutar 3s, file retained last-writer pid=65668

Path L-2 rejection rationale

Per-cell sentinel ili O_EXCL flag edit zahteva izmenu u runner.ts:852 i/ili runner-lock.ts, oba frozen per manifest v4 §11. Triggers manifest v5 reemisiju. Ne opravdano kada L-1 waiver drži.

Artefact

Memo: benchmarks/results/manifest-v4-lock-semantics-clarification.md
Memo SHA-256: f410b4f5e6c97c405cd39c51c385dfca9079a6f80a0a296a904309d5ab239d83
Anchor commit: 67eb89914a49ec38049379bf952d5f62b82c188d on feature/c3-v3-wrapper

Task 2.6 carry-over ticket

bench-lock-exclusive-create (defensive upgrade, Stage-3-independent):

Swap fs.writeFileSync → fs.openSync(path, 'wx') (O_EXCL) in runner-lock.ts
Per-cell sentinel path in runner.ts:852
Parallel-acquire unit test (exactly one succeeds, other throws)

Next gate

CC-1 authorized to advance to §1.2 Runner Early-Exit RCA memo. No self-advance to N=400 re-kick.

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