status(conc): bootstrap phase state files — P1 in flight on branch restructure/concurrency

STATUS-conc.md

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+# STATUS — sub-phase conc (concurrency restructure)
+
+Plan: /srv/cc-ci/cc-ci-plan/concurrency-restructure-full-plan.md (SSOT for this phase)
+
+## Phase state
+
+- Phase: conc — concurrency restructure (P1–P5 + tests/concurrency)
+- Builder branch: `restructure/concurrency` (code lands there; main untouched until M2 merge)
+- In flight: P1 (lock-lifetime hardening)
+- Gate: none claimed yet
+
+## Gates
+
+- M1 (implementation verified): NOT CLAIMED
+- M2 (merged + live-verified): NOT CLAIMED — blocked on M1 PASS
+
+## Blockers
+
+(none)