{
  "ok": false,
  "error": "Academy structured output invalid after round-specific canonicalisation: '{' was never closed (<unknown>, line 27)",
  "retryable": true,
  "infrastructure_failure": true,
  "output_contract": "academy_round_json_v6",
  "exam_round": 3,
  "raw_answer": "{\n  \"round\": 3,\n  \"transfer_project\": {\n    \"title\": \"Household Shelf Extrusion Transfer\",\n    \"goal\": \"Apply extrusion logic to create a valid solid for a bookshelf design using harmless household materials.\",\n    \"inputs\": [\n      {\"type\": \"vector_2d\", \"name\": \"base_profile\"},\n      {\"type\": \"scalar\", \"name\": \"extrusion_distance\"}\n    ],\n    \"steps\": [\n      \"Define the base profile with explicit origin, axes, and units in millimeters.\",\n      \"Extrude the constrained geometry along a specified axis to form a closed solid.\",\n      \"Validate that all faces are manifold and normals point outward without self-intersection.\"\n    ],\n    \"outputs\": [\n      {\"type\": \"solid_mesh\", \"name\": \"shelf_geometry\"},\n      {\"type\": \"boolean_flag\", \"name\": \"validity_check\"}\n    ],\n    \"acceptance_criteria\": [\n      \"The output solid must have exactly zero non-manifold edges and no self-intersecting faces.\",\n      \"All face normals must be consistently outward-facing relative to the defined coordinate system.\"\n    ]\n  },\n  \"boundary_cases\": {\n    \"minimum\": {\"value\": 1.0, \"unit\": \"mm\", \"description\": \"Minimum extrusion distance ensuring a closed volume exists.\"},\n    \"nominal\": {\"value\": 50.0, \"unit\": \"mm\", \"description\": \"Standard design length for the household shelf component.\"},\n    \"maximum\": {\"value\": 200.0, \"unit\": \"mm\", \"description\": \"Maximum safe dimension before structural instability or tool limits are reached.\",\n      \"invalid\": {\n        \"condition\": \"negative_distance_or_zero_volume\",\n        \"reason\": \"Extrusion distance must be strictly positive to generate a valid closed solid; zero results in no volume.\"\n      }",
  "raw_answer_sha256": "8a1f7479cb495b7e0be52fa54deb9e6c62a02510ac439f80a3991891f2dc096a",
  "raw_answer_audited": true,
  "model_retry_count": 0,
  "model_retry_reason": "",
  "initial_raw_answer": "",
  "initial_raw_answer_sha256": ""
}