{
  "gate": 1,
  "phase": "Phase 1 - Subspace + faithfulness",
  "status": "FAIL",
  "fallback_path": null,
  "metrics": [
    {
      "name": "token_lesion_auroc_density_A",
      "modality": "LIDC-IDRI(val)", "budget": null,
      "value": 0.5650, "ci95": [0.5579, 0.5720], "test": "DeLong",
      "threshold": 0.70, "threshold_status": "CALIBRATE",
      "passed": false,
      "detail": "Construction A (density / kNN-sparse). AUROC 0.565, CI lower 0.558 < 0.65."
    },
    {
      "name": "token_lesion_auroc_residual_B",
      "modality": "LIDC-IDRI(val)", "budget": null,
      "value": 0.5509, "ci95": [0.5440, 0.5578], "test": "DeLong",
      "threshold": 0.70, "threshold_status": "CALIBRATE",
      "passed": false,
      "detail": "Construction B (normal-manifold residual). AUROC 0.551, CI lower 0.544 < 0.65."
    },
    {
      "name": "comparator_attention_saliency_auroc",
      "modality": "LIDC-IDRI(val)", "budget": null,
      "value": 0.7668, "ci95": [0.7605, 0.7731], "test": "DeLong",
      "threshold": null, "threshold_status": "comparator",
      "passed": true,
      "detail": "CLS-to-token attention (last block, exact). Strongly localizes lesions, confirming masks+patch alignment are valid."
    },
    {
      "name": "comparator_random_auroc",
      "modality": "LIDC-IDRI(val)", "budget": null,
      "value": 0.5115, "ci95": [0.5028, 0.5201], "test": "DeLong",
      "threshold": null, "threshold_status": "comparator", "passed": true,
      "detail": "Random baseline ~0.5 as expected."
    },
    {
      "name": "density_A_vs_attention_delong_diff",
      "modality": "LIDC-IDRI(val)", "budget": null,
      "value": -0.2018, "ci95": [-0.2094, -0.1942], "test": "DeLong_paired",
      "threshold": 0.0, "threshold_status": "FIXED(must_exceed_0)",
      "passed": false,
      "detail": "A is 0.202 AUROC WORSE than attention; CI excludes 0 in the wrong direction (p~0)."
    },
    {
      "name": "residual_B_vs_attention_delong_diff",
      "modality": "LIDC-IDRI(val)", "budget": null,
      "value": -0.2159, "ci95": [-0.2235, -0.2083], "test": "DeLong_paired",
      "threshold": 0.0, "threshold_status": "FIXED(must_exceed_0)",
      "passed": false,
      "detail": "B is 0.216 AUROC WORSE than attention; CI excludes 0 in the wrong direction (p~0)."
    },
    {
      "name": "dice_vs_mask_density_A",
      "modality": "LIDC-IDRI(val)", "budget": null,
      "value": 0.0787, "ci95": null, "test": "mean_dice@q0.9",
      "threshold": 0.0095, "threshold_status": "CALIBRATE(2x_random)",
      "passed": true,
      "detail": "Dice (>3-patch lesions) 0.079 vs ~0.005 random proxy; Dice(1-3 patch) 0.023. Weak but > random."
    }
  ],
  "thresholds_locked_ref": null,
  "seeds": [0],
  "data_gaps": [],
  "eval_summary": {
    "eval_split": "val",
    "n_patches": 916496,
    "n_lesion_patches": 4368,
    "lesion_prevalence": 0.00477,
    "eval_slices": 4676,
    "pos_slices": 2338,
    "neg_slices_sampled": 2338,
    "token_bank": "processed/covtoken/ct_token_bank_v0.pt (2,107,392 tokens)",
    "eval_masks": "processed/lidc_v2 (TCIA DICOM-SEG, z-ordered, self-consistent)",
    "metrics_artifact": "processed/covtoken/gate1_metrics.json"
  },
  "decision_rule": "PASS iff the better construction has AUROC>=0.70 (CI lower>0.65) AND beats attention-saliency with DeLong CI excluding 0. FAIL if neither construction beats saliency.",
  "decision": "FAIL: neither label-free construction reaches the AUROC floor, and both are ~0.20 AUROC WORSE than the attention-saliency comparator. The load-bearing assumption (L(x) localizes lesions without labels in MedDINOv3 feature space) does not hold as specified.",
  "post_mortem": "gate_reports/gate_1_postmortem.md",
  "human_signoff": null
}