Function PruneWorktrees

internal/git/worktree.go:189–196

PruneWorktrees runs `git worktree prune` to clean up stale worktree tracking.

(repoDir string)

// PruneWorktrees runs `git worktree prune` to clean up stale worktree tracking.
func PruneWorktrees(repoDir string) error {
	cmd := exec.Command("git", "worktree", "prune")
	cmd.Dir = repoDir
	if out, err := cmd.CombinedOutput(); err != nil {
		return fmt.Errorf("failed to prune worktrees: %s", strings.TrimSpace(string(out)))
	}
	return nil
}

// DetectOrphanedWorktrees scans .chief/worktrees/ and returns a map of PRD name -> absolute worktree path
// for worktrees that exist on disk. The caller is responsible for determining which are orphaned