/**
 * test_atomic_writer — Story 6.1 regression suite.
 *
 * Asserts the AtomicWriter contract:
 *   1. Happy path round-trip
 *   2. Crash safety (rename failure leaves no corrupted final file)
 *   3. OPENLIFE_ATOMIC_WRITES=off fallback to plain writeFileSync
 *   4. JSONL append atomicity
 *
 * Run via: `npm run test:atomic-writer` (compiles + executes dist/).
 *
 * Pattern: throws or process.exit(1) on failure; prints
 * TEST_ATOMIC_WRITER_OK on full pass.
 */
export {};
