* Add inbound attachment handling and pruning
* Add Signal attachment support and logging
- Implement full Signal attachment collection (copies from signal-cli dir)
- Add logging when attachments are saved to disk for all channels
- Skip audio attachments in Signal (handled by voice transcription)
Written by Cameron ◯ Letta Code
* Gitignore bun.lock
Keep lockfile local, don't track in repo.
Written by Cameron ◯ Letta Code
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Co-authored-by: Jason Carreira <jason@visotrust.com>
