Implements a new doctor check that detects attached molecules that
haven't been updated in too long, which may indicate stuck work.
The check:
- Finds all pinned beads with attachments across rigs
- Checks the attached molecule's UpdatedAt timestamp
- Reports molecules in_progress with no activity for >1 hour
- Provides actionable fix hints for stuck polecats
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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