refactor: Rename RecreateWithOptions to RepairWorktreeWithOptions

Clarify that this operation is for stale state recovery, not normal recycling:

- Recreate → RepairWorktree
- RecreateWithOptions → RepairWorktreeWithOptions
- Updated comments to explain this handles reconciliation when AllocateName
  returns a name that already exists (stale state needing repair)
- Updated polecat_spawn.go output: Recreating → Repairing stale
- Updated gc command help text for consistency

The function is useful for atomic hook_bead setting during repair, so kept
rather than replacing with Remove + Add.

Fixes gt-l0lok

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/cmd/polecat.go

@@ -147,8 +147,8 @@ var polecatGCCmd = &cobra.Command{
 	Long: `Garbage collect stale polecat branches in a rig.
 
 Polecats use unique timestamped branches (polecat/<name>-<timestamp>) to
-prevent drift issues. Over time, these branches accumulate as polecats
-are recreated.
+prevent drift issues. Over time, these branches accumulate when stale
+polecats are repaired.
 
 This command removes orphaned branches:
   - Branches for polecats that no longer exist