Function cacheKey

src/github/file_cache.mjs:14–17

(parts)

 * Keep this deterministic across platforms by using JSON with sorted keys.
 */
export function cacheKey(parts) {
  const stable = JSON.stringify(parts, Object.keys(parts).sort());
  return sha256Hex(stable);
}

export function ensureDir(dirPath) {
  fs.mkdirSync(dirPath, { recursive: true });