- Add WorktreeAddExistingForce to git package (uses --force flag)
- Fix worktree creation: use force flag so main can be checked out
in multiple worktrees (needed for cross-rig work)
- Implement 'gt worktree remove <rig>' with --force flag
- Refuse to remove worktrees with uncommitted changes unless forced
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>