Cleanup Worktrees

Intelligent git worktree cleanup. Discovers all worktrees, checks their status, categorizes them, and removes stale ones safely.

Phase 1: Discover Worktrees

List all worktrees:

git worktree list --porcelain

Parse the output to collect:

• Worktree path
• Branch name (or detached HEAD SHA)
• Whether it is the currently checked-out worktree (marked HEAD in output)