Release v1.2.2: recover stale room registry locks

[nillo]

Summary

Prepares v1.2.2 with stale room-registry lock recovery plus the approved low-risk issue-66 stability nuggets.

Changes

• Add holder metadata to the room registry lock and reclaim dead same-host holders while failing closed for live or ambiguous holders.
• Add tests for holder metadata, dead-PID reclaim, live-PID non-reclaim, old invalid lock recovery, session reactivation, and open mesh lane detection.
• Port reactivateArchived, runtimeSessionHasOpenMeshLane, and a locked-path named Codex double-launch guard into the current v1.2.1 code.
• Keep src/codex-adapter.ts unchanged; tracked the multi-turn watchdog hypothesis separately as Multi-turn watchdog force-clear can stall Claude-to-Codex injection queue #87.
• Bump v1.2.2 package, plugin, marketplace, and MCP versions and rebuild plugin bundles.

Testing

• bun test src/unit-test/room-registry.test.ts src/unit-test/session-registry.test.ts src/unit-test/codex-adapter.test.ts
• bun run typecheck
• bun run build:cli
• bun run build:plugin
• bun run check
• git diff --check

Related Issues

• Fixes Add stale room-registry lock detection and reclaim #86
• Follow-up filed: Multi-turn watchdog force-clear can stall Claude-to-Codex injection queue #87

Release note

This PR does not create a GitHub Release and does not publish npm. Those remain human-go-gated for v1.2.2.