Bare clones don't have refs/remotes/origin/* populated by default.
The configureRefspec fix (a91e6cd6) set up the fetch config but didn't
actually run a fetch, leaving origin/main unavailable.
This caused polecat worktree creation to fail with:
fatal: invalid reference: origin/main
Fixes:
1. Add git fetch after configureRefspec in bare clone setup
2. Add fetch before polecat worktree creation (ensures latest code)
The second fix matches RepairWorktreeWithOptions which already had a fetch.
Related: #286
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>