Implements all 6 critical resilience fixes from phase-a-stop-dying.md:
- Issue 2.9: Migrate std::sync::RwLock → parking_lot::RwLock (7 files)
Prevents lock poisoning cascade on writer panic
- Issue 2.2: Add install_panic_hook() to log panics via tracing
Ensures panics are captured in logs/journald before process death
- Issue 3.7: Add ExecStopPost to systemd service
Cleans up stale FUSE mounts on service stop
- Issue 2.7: Add check_stale_mount() detection on startup
Auto-cleans leftover mounts from previous crashes
- Issue 2.10: Integrate sd_notify for systemd lifecycle
Sends READY=1 after mount, STOPPING on shutdown
- Issue 2.1: Add signal handling with spawn_mount
Catches SIGTERM/SIGINT for clean shutdown instead of instant death
All 7 Phase A tests pass:
- test_poisoned_tree_lock_returns_eio_not_panic
- test_parking_lot_rwlock_survives_panic
- test_panic_hook_logs_to_tracing
- test_systemd_service_has_execstoppost
- test_stale_mount_check_function_exists
- test_sd_notify_ready_sent
- test_sigterm_triggers_shutdown
- Add tracing-appender and tracing-journald for production logging
- Add LoggingConfig with trace_sample_rate, json_output, journald options
- Expand init_logging() with file rotation, journald, and stderr layers
- Add sanitize_path() helper for PII protection in logs
- Instrument FUSE operations with #[instrument] and trace decision points
- Instrument gRPC handlers (10 methods) with span correlation
- Add spawn instrumentation for health monitor, indexer, watcher tasks
- Add broadcast lag handling (RecvError::Lagged) in event subscribers
- Fix webhook.rs expect() calls with proper error handling
- Add logging to patterns.rs, collections.rs, artwork.rs database ops
- Add Drop impl logging for PluginManager and WatchHandle
- Update systemd service with rate limiting and journal output
- Add logrotate config and example config.toml with logging section
- SearchOps with moka LRU cache for results and inode mapping
- 256 char query length limit with truncation
- Safe symlink targets with path normalization
- Integrates with filesystem.rs for lookup/getattr/readdir/readlink
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/claude-agent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
- Add musicfs-cas crate: CasStore, ChunkHash, FileReader, ChunkManifest
- Add LruEviction policy to musicfs-cache for cache size management
- Integrate FileReader into FUSE filesystem for actual file reads
- Use xxHash64 for content hashing, sled for index, msgpack serialization
- Default cache path: ~/.cache/musicfs/chunks/ with 256 subdirs sharding
- 20 new tests (14 CAS unit + 3 integration + 3 eviction), 54 total
Alexander