Function usage

bench/diff.js:51–56

()

}

function usage() {
  console.log('Usage: node bench/diff.js <baseline> <feature> [--threshold 0.02] [--json]');
  console.log('');
  console.log('  Each argument is a harness JSON file or a directory containing one.');
  console.log('  Exit: 0 improved, 1 regressed, 2 noise, 3 usage/IO.');
}

// ─── result loading ──────────────────────────────────────────────────────────