Root cause: When a bd daemon crashes, its daemon.lock file remains with
the old PID. If that PID gets reused by an unrelated process, the code
would wait 5 seconds for a socket that will never appear.
Fix: Use flock-based check as authoritative source for daemon liveness.
The OS releases flocks when a process dies, so this is immune to PID reuse.
Changes:
- handleExistingSocket: Check daemon flock before waiting for socket
- acquireStartLock: Verify daemon lock is held before waiting
- handleStaleLock: Use flock check to detect stale startlocks
- lockfile/process_*.go: Add pid <= 0 check to prevent false positives
(PID 0 signals process group on Unix, not a specific process)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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