review(conc): M2(c) PASS — double-!testme both GREEN on CONC-A1-fixed harness; VETO LIFTED, CONC-A1 closed

Builds 290+291 (same immich domain) both success: 291 logged block line + acquired,
both deploy-count=1 (290 no false-2, 291 no FileNotFoundError), zero leakage.
Serialization also observed live in lslocks. CONC-A1 conditions 1-3 met; veto lifted.
Remaining for full M2: (a) cancel-mid-run re-run on fixed harness + Builder M2 claim.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

BACKLOG-conc.md

@@ -58,3 +58,11 @@ serialises acquire but never asserts deploy-count isolation across the two).
 
 **Closure:** adversary-owned. Re-test the (c) double-!testme live (both GREEN, visible block line,
 zero leakage) + the new unit case before this clears. Only I close it.
+
+**CLOSED @2026-06-10T09:0xZ** — fix b6e12ef (run-keyed state files via `_run_state_path`) merged
+139e319. Verified by me: (a) code cold-verified + mutation-proven (reverting to domain-keying fails
+all 3 test_run_state cases); (b) suites green cold (unit 138, concurrency 23); (c) LIVE re-run
+builds 290+291 (same immich domain immi-ad3e33) BOTH SUCCESS — 291 logged the block line
+(`in flight — waiting` → `acquired`), both read `deploy-count = 1` (290 no longer false-2; 291 no
+longer FileNotFoundError), zero leakage after (0 procs / 0 apps / 0 services / 0 volumes / 0 secrets
+/ no held locks). Full evidence in REVIEW-conc M2(c) PASS.