24086cc744
BlueDoc covering 6 critical resilience fixes with TDD flow: - 2.9: RwLock → parking_lot (poison-free locks) - 2.2: Panic hook with tracing integration - 3.7+2.7: systemd ExecStopPost + stale mount cleanup - 2.10: sd_notify READY/STOPPING - 2.1: Signal handling via spawn_mount2 + tokio signals Each with: stubs → RED tests → implementation → GREEN verify. ~5 days estimated, exact files and code patterns specified.