- Increase quit timeout from 900ms to 5000ms to ensure pending saves complete
- Add persistNowSync() called before update install to flush queue to disk
- Remove blockAllPersistence from shutdown save condition — shutdown must
always persist to prevent data loss across restarts
- Add temp file recovery as last resort when both primary and backup
session files are corrupted
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
