{
  "kind": "structural_zero",
  "lane": "calibration",
  "metrics": {
    "coherent_accuracy": 0.0,
    "correction_proposed_accuracy": 0.0,
    "no_grounding_accuracy": 0.0,
    "overall_accuracy": 0.0,
    "overall_pass": false
  },
  "model_id": "frontier-structural-zero",
  "note": "Frontier LLMs do not emit the typed signals these sub-metrics score; see docs/frontier_baselines.md",
  "rationale": "Classification depends on vault_hits and pack_mutation_proposal. Frontier outputs expose neither; a wrapper classifier on prose IS the missing typed signal, not a property of the model.",
  "timestamp": "2026-05-16T19:44:44.245649+00:00",
  "version": "v1"
}
