feat: add scanner for stale and orphaned git worktrees

[yahorbarkouski]

What does this PR do?

Adds a new git-worktrees scanner that finds stale and orphaned git worktrees left behind by agents and local feature checkouts. These often contain full dependency trees and can reclaim tens of gigabytes, but were invisible to existing cache/node_modules scanners.

Discovery combines a deep home crawl with git worktree registries (so registered worktrees outside the crawl path are still found), plus dedicated agent roots (~/.cursor/worktrees, ~/.claude/worktrees, ~/.codex/worktrees).

The interactive picker and verbose scan output now show a detail column with relative age (17d ago) or orphaned.

Type of change

• Bug fix
• New feature (new scanner, command, or option)
• Improvement to existing feature
• Chore / dependency update
• Documentation

Related issue

N/A

Checklist

• bun run lint passes
• bun run test passes (no regressions)
• bun run build succeeds
• New tests added for new behavior
• I've tested this on macOS locally

Notes for reviewer

• Category is risky with supportsFileSelection, so cleanup requires --risky / --unsafe and can be narrowed per worktree.
• Stale = linked worktree directory mtime older than 7 days; orphaned = gitdir: target missing (always reported).
• Primary checkouts (.git directories) are never offered for deletion.
• Sizing uses /usr/bin/du -sk with a JS fallback for speed on large trees.

Usage

mac-cleaner-cli scan -c git-worktrees --verbose
mac-cleaner-cli --risky
mac-cleaner-cli clean -c git-worktrees --unsafe --dry-run

Made with Cursor

[yahorbarkouski]

was super useful personally so decided to check if it will help anyone else, let me know if looks good kind man @guhcostan

[guhcostan]

Thank you @yahorbarkouski!