grabbit e6c48c9bd9 Harden supervisor shutdown: process group isolation, write-back drain
- Spawn all children (rclone, smbd, webdav) in isolated process groups
  so Ctrl+C doesn't reach them directly — supervisor controls shutdown order
- Wait for rclone VFS write-back queue to drain before unmounting (5min cap)
- Prefer fusermount3 over fusermount, skip if already unmounted

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-02-18 09:56:09 +08:00
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