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c0baba86ce
Address Claude's review of #1510. The original count-then-claim guard had a TOCTOU window: N hooks could each read `active < MAX_INFLIGHT` between readdirSync and the per-pid `wx` write and all proceed, briefly exceeding the cap. The PR title's "cap" language overstated this. Replace with fixed-name `slot-0.lock` ... `slot-N.lock` under `.hook-locks/`. `O_CREAT|O_EXCL` on a fixed path is OS-atomic — exactly one process wins each slot, so the cap is hard regardless of burst arrival timing. Each slot file contains the owning PID so stale-takeover still works when a hook crashes without releasing. PID liveness is checked before age (Claude's Finding 3): a slow-but-alive hook is never wrongly evicted. The 30s age window only kicks in to defend against PID reuse on a long-abandoned slot, well above the 7s augment timeout so a healthy run never hits it. Also adds the missing concurrency-guard tests to cursor-hook.test.ts (Claude's Finding 2): source-level wiring + dead-PID reclaim + 3-slots-full bail. Previously only the CJS and Plugin variants had test coverage for the guard; the Cursor variant was validated only by code inspection. Tests: 5726 passing, +9 from baseline (1 hard-cap burst test + 4 source regressions in hooks.test.ts; 3 source + 2 integration in cursor-hook.test.ts). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> |
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