Replace Unix-only syscall.Flock with gofrs/flock library for
cross-platform file locking. This enables the daemon to run on
Windows in addition to Unix-like systems.
- Add github.com/gofrs/flock v0.13.0 dependency
- Replace syscall.Flock calls with flock.TryLock/Unlock
- Maintain same non-blocking exclusive lock semantics
(gt-5354h)
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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