{
  "ok": false,
  "error": "Academy structured output invalid after round-specific canonicalisation: Academy structured output invalid: unexpected fields: acceptance_criteria, project_steps, safe_knowledge_gate, unknown_source_quarantine",
  "retryable": true,
  "infrastructure_failure": true,
  "output_contract": "academy_round_json_v6",
  "exam_round": 3,
  "raw_answer": "{\n  \"project_steps\": [\n    \"Define a rectangular prism base with explicit origin (0,0,0) and dimensions in millimeters.\",\n    \"Apply chamfer constraints to all top edges using fixed angles of 45 degrees relative to the surface normal.\",\n    \"Validate that resulting geometry remains a single closed manifold without self-intersections.\"\n  ],\n  \"acceptance_criteria\": [\n    \"All output faces must have consistent outward-facing normals verified by dot product > -0.99 against adjacent face vectors.\",\n    \"The total volume of the chamfered solid must be exactly calculable via convex hull integration within a tolerance of \u00b11 cubic millimeter.\"\n  ],\n  \"boundary_cases\": [\n    \"Chamfer angle exceeding 45 degrees causing edge overlap and manifold violation.\",\n    \"Applying chamfers to non-planar or curved surfaces where linear offset creates gaps.\"\n  ],\n  \"unknown_source_quarantine\": \"No external CAD kernels accessed; all geometry derived from supplied coordinate definitions only.\",\n  \"safe_knowledge_gate\": \"This solution applies pure mathematical construction rules for solid modeling without physical tool simulation.\",\n  \"limitations\": [\n    \"Cannot simulate material removal depth or resulting surface roughness in the output model.\",\n    \"Does not account for manufacturing tolerances required by specific CNC machine capabilities.\"\n  ]\n}",
  "raw_answer_sha256": "6c535fb2e0b25e4fcaba149add3da68b25161db4072aee716cb93632c051fdb7",
  "raw_answer_audited": true,
  "model_retry_count": 0,
  "model_retry_reason": "",
  "initial_raw_answer": "",
  "initial_raw_answer_sha256": ""
}