Claude Code e69f7a30e4 fix: address critical TOCTOU race condition and error handling inconsistencies ...

- Fix TOCTOU race condition in SaveEvent by holding the lock throughout entire version validation and publish operation
- Add getLatestVersionLocked helper method to prevent race window where multiple concurrent threads read the same currentVersion
- Fix GetLatestSnapshot to return error when no snapshot exists (not nil), distinguishing "not created" from "error occurred"
- The concurrent version conflict test now passes with exactly 1 success and 49 conflicts instead of 50 successes

These changes ensure thread-safe optimistic concurrency control and consistent error handling semantics.

Co-Authored-By: Claude Code <noreply@anthropic.com>

2026-01-13 09:02:36 +01:00

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