Method getProtectedBranches

src/node/worktree/WorktreeManager.ts:811–846

(
    projectPath: string,
    localBranches: string[],
    noHooksEnv: GitExecOptions
  )

  }

  private async getProtectedBranches(
    projectPath: string,
    localBranches: string[],
    noHooksEnv: GitExecOptions
  ): Promise<Set<string>> {
    const protectedBranches = new Set<string>(PROTECTED_BRANCH_NAMES);

    // If there's only one local branch, treat it as protected (likely trunk).
    if (localBranches.length === 1) {
      protectedBranches.add(localBranches[0]);
    }

    const currentBranch = await getCurrentBranch(projectPath);
    if (currentBranch) {
      protectedBranches.add(currentBranch);
    }

    // If origin/HEAD points at a local branch, also treat it as protected.
    try {
      using originHeadProc = execFileAsync(
        "git",
        ["-C", projectPath, "symbolic-ref", "refs/remotes/origin/HEAD"],
        noHooksEnv
      );
      const { stdout } = await originHeadProc.result;
      const ref = stdout.trim();
      const prefix = "refs/remotes/origin/";
      if (ref.startsWith(prefix)) {
        protectedBranches.add(ref.slice(prefix.length));
      }
    } catch {
      // No origin/HEAD (or not a git repo) - ignore.
    }

    return protectedBranches;
  }

  private async isBranchCheckedOutByWorktree(
    projectPath: string,