Improvements based on oracle code review:
- Move socket cleanup AFTER lock acquisition (prevents unlinking live sockets)
- Add PID liveness check before removing stale socket
- Add stale lock detection with retry mechanism
- Tighten directory permissions to 0700 for security
- Improve socket readiness probing with shorter timeouts
- Make removeOldSocket() ignore ENOENT errors
Fixes race condition where socket could be removed during daemon startup window,
potentially orphaning a running daemon process.
Amp-Thread-ID: https://ampcode.com/threads/T-63542c60-b5b9-4a34-9f22-415d9d7e8223
Co-authored-by: Amp <amp@ampcode.com>
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