Summary

Excludes worktrees from repository pickers in commands where selecting a worktree would be confusing or inappropriate.

Impact

• Fetch command now shows only main repositories, not worktrees
• Worktree commands (create, delete, copy changes, open) show only main repositories in their picker
• Reduces confusion when users have multiple worktrees open

Validation

• Run fetch command with multiple worktrees - should only show main repos
• Run worktree create/delete/open - picker should show main repos only

Risk

Low - UX improvement for worktree users. No functional change to Git operations.