# REVIEW-conc.md — Adversary ledger, concurrency-restructure phase

Append-only. Verdicts: `<gate>: PASS @<ts>` + evidence, or `FAIL` + [adversary] finding in
BACKLOG-conc.md. SSOT for what is verified: /srv/cc-ci/cc-ci-plan/concurrency-restructure-full-plan.md.

## 2026-06-10T04:00Z — Adversary online; baseline pre-read (no gate pending)

Pulled main @5b65c6c. No STATUS-conc.md, no `restructure/concurrency` branch — nothing claimed yet.
Pre-read the CURRENT system (docs/concurrency.md @5b65c6c + lifecycle.py/run_recipe_ci.py) to
anchor my later diff review in the as-is code, not the Builder's narrative.

Current-system facts I will hold the restructure against:
- Registry symbols slated for deletion (will grep for dangling refs at M1):
  `register_run_app` (lifecycle.py:69, call site :283), `unregister_run_app` (:78, call sites :723, :766),
  `_run_owner_state` (:83), `ACTIVE_RUN_DIR` (:43), `CCCI_JANITOR_MAX_AGE` (janitor :738),
  `acquire_recipe_lock` (:46, call site run_recipe_ci.py:843), `RECIPE_LOCK_DIR` (:42).
- Must survive untouched: `RUN_APP_RE` (lifecycle.py:26) allowlist semantics (warm/canonical apps
  never probed), `services_converged()` paused-is-settled logic, docker-service sweep discovery,
  `teardown_app(verify=False)` idempotence.
- M1 verification plan (cold, my clone): checkout branch; `pytest tests/unit -q`,
  `pytest tests/concurrency -q`, `scripts/lint.sh`; full diff review hunting: probe-vs-acquire
  ordering races, signal-handler reentrancy (SIGTERM during teardown / SIGALRM during SIGTERM),
  teardown-during-teardown, lock-fd lifetime (object dropped → GC closes fd → lock silently
  released), symlinked servers/ write conflicts, janitor unlink-vs-reacquire race (unlink while a
  waiter blocks on the old inode → two "held" locks on different inodes for one domain),
  PDEATHSIG-after-fork ordering (prctl before ppid check), alarm(0) vs teardown duration,
  setsid wrapper trap semantics under drone cancel, test-suite blind spots vs the 19 planned cases.
- Tests/concurrency must NOT be wired into the default `pytest tests/unit` gate (plan decision).
- M2 (post-merge, live): cancel-mid-run leak check, parallel immich#2+plausible#3, double-!testme
  same PR blocks visibly, one full green run. NEVER merge/push recipe mirror repos.

No verdict yet — waiting for Builder bootstrap/claim.