程序员阿江(Relakkes) bf9b561cc7 fix(adapters): eliminate AttachmentStore collision race and orphan .part cleanup
Address two production issues in the AttachmentStore:
1. TOCTOU race in resolvePath() — concurrent downloads with same filename in
   the same millisecond could collide. Fixed by appending a 6-char random suffix
   to the timestamp-based path, ensuring millisecond-level collisions never occur.
2. Orphan .part files from crashed writes never cleaned up. Fixed by extending
   gc() to recognize .part files and clean them with a shorter grace period
   (10 minutes by default) rather than the normal retention window.

Added two test cases covering heavy collision pressure and .part cleanup.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-11 21:08:30 +08:00
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