{
  "version": "E题V2 Q1 B0-B4",
  "samples": 100,
  "video_groups": 37,
  "folds": 5,
  "grouping": "video_id GroupKFold; train/valid group disjoint",
  "scalers": "B0 train-fold mean/std; B1-B4 train-fold median/MAD; no held-fold fitting",
  "classifier": "LogisticRegression C=0.05",
  "regressor": "Ridge alpha=25",
  "branches": {
    "B0": "quality-weighted physical projection",
    "B1": "B0 plus train-fold robust scale and SO(3)/unit-gaze aggregation",
    "B2": "B1 plus CTC forward-backward text occupancy",
    "B3": "B1 plus native-row level-2 dynamics",
    "B4": "B1 plus frozen Wav2Vec2 auxiliary representation"
  },
  "B5": "query H_time audit only; not predictive score",
  "B6": "content probe disabled",
  "feature_manifest_sha256": "172d5d11964a800fff364e0592afb6959fa4bdc52f91106d4da428fcc175a054",
  "source_run_manifest": "features_v2/manifest_q1.jsonl",
  "bootstrap_repeats": 200
}