Add doctor check to detect handoff beads for agents that no longer exist.
This happens when a polecat worktree is deleted but its handoff bead remains.
- Check: orphaned-attachments
- Warning if: Handoff bead exists for agent that no longer has worktree
- Supports polecats (rig/name), crew (rig/crew/name), mayor, witness, refinery
- Suggests re-sling to active agent or close the molecule
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>