{
  "explanation_coverage": 1.0,
  "omitted_required_nodes": [
    "artifact.profile"
  ],
  "policy_denied_required_nodes": [
    "artifact.profile"
  ],
  "provenance_coverage": 0.0,
  "selected_expected_nodes": [
    "decision.boundary"
  ],
  "source_span_coverage": 1.0,
  "stale_item_activation_count": 0,
  "token_budget_utilization": 0.45
}