Implement circular buffer bag recorder with:
- Configurable topics recording
- Last N minutes circular buffer (default 30min)
- Manual save trigger via /saltybot/save_bag service
- Auto-save on crash with signal handlers
- Storage management (7-day TTL, 50GB quota)
- Compression via zstd
- Optional rsync to NAS for backup
- Periodic maintenance (cleanup expired, enforce quota)
Saves to /home/seb/rosbags/ by default.
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
sl-jetson
88deacb337