Improvements:
1. Added top-level panic recovery in runDaemonLoop
- Captures stack trace and logs to daemon.log
- Writes daemon-error file with crash details for user visibility
- Cleans up PID file on panic
2. Replaced os.Exit calls with return statements where possible
- Allows deferred cleanup to run (lock release, socket removal, etc)
- Improves graceful shutdown on errors
3. Enhanced stopDaemon forced-kill path
- Removes stale socket file after process.Kill()
- Prevents socket artifacts from accumulating
4. Added integration tests for crash recovery
Closes bd-vcg5
