{
  "events_csv": "/Users/mv/Desktop/cncmock/policy/副本传生2M采集记录.csv",
  "raw_dir": "/Users/mv/Desktop/cncmock/1-机床移动",
  "valid_event_count": 22,
  "variants": [
    "csv_duration",
    "fixed_10ms"
  ],
  "frequency_grid_hz": "0..1000000 step 100",
  "compact_rows": 142,
  "wide_rows": 142,
  "qc_status_counts": {
    "ok": 44
  },
  "note": "FFT is non-zero-padded. Export grid is interpolated to 100 Hz for comparison."
}