chore: restore original directory structure (project under code-review-graph-main/)

code-review-graph-main/skills/project-review/references/manual-review/distributed-lock.md

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+# Distributed Lock — Manual Review Checklist
+
+High-risk module: distributed-lock changes require architecture confirmation.
+
+- [ ] Lock has a TTL / expiry — no permanent deadlock after crash
+- [ ] Lock release is atomic and ownership-checked (compare-and-delete)
+- [ ] Lock scope is correct (key includes the right entity identifiers)
+- [ ] Renewal / watchdog exists for long critical sections
+- [ ] Locking order is consistent across paths (no lock-ordering deadlock)
+- [ ] Fencing tokens / version check prevents stale-holder writes
+- [ ] Fail-open vs fail-closed behavior is intentional and documented