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37c478cf2f
Add sync_back() to FileSyncManager — on sandbox cleanup, downloads the remote .hermes/ directory as a tar archive, diffs against SHA-256 hashes of what was originally pushed, and applies only changed files. - SHA-256 content hashing on push for accurate change detection - Retry with exponential backoff (3 attempts, 2s/4s/8s) - SIGINT deferred during sync-back to prevent partial writes - fcntl.flock serialization for concurrent gateway sandboxes - Last-write-wins conflict resolution with logged warnings - New files created on remote are pulled back via path inference - Backend implementations: SSH (tar cf over pipe), Modal (exec tar cf, read stdout), Daytona (exec tar cf, SDK download_file) - Wired into cleanup() for all three backends (runs before ControlMaster close / sandbox terminate / sandbox stop) 28 new tests (10 FSM core + 18 backend-specific), 72 total passing.