- Move integrity check before SCHEMA_SQL writes (was after, contradicting comment)
- Log error message in checkpoint recovery catch block
- Make flushAgentLogBuffer private
- Move deleteTask flush inside withTaskLock to prevent race
- Use try/finally in flush so splice always runs on failure
- Filter stale task entries during flush to prevent buffer poisoning
- Add flush before getAgentLogsByTimeRange for read consistency
- Clean up leaked temp dir in fresh DB test
- Fix false-positive buffer-capacity test (query DB directly)
- Rename misleading "single flush" test title
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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