Implements the nuclear cleanup option for post-merge polecat removal:
- Kills Claude session (force mode)
- Deletes git worktree (bypassing all safety checks)
- Deletes polecat branch
- Closes agent bead
Supports --all for bulk nuke and --dry-run for preview.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>