gt shutdown now performs full polecat cleanup after killing sessions:
- Removes worktrees
- Deletes polecat branches from mayor's clone
- Protects polecats with uncommitted work (refuses to clean)
Added --nuclear flag to force cleanup even with uncommitted work.
Closes gt-u1k
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>