{
  "$defs": {
    "evidence_boundary": {
      "additionalProperties": false,
      "properties": {
        "evidence_class": {"const": "companion_local_receipt_only"},
        "host_request_owned": {"const": false},
        "provider_claim_authority": {"const": false},
        "provider_join_status": {"const": "missing"},
        "runtime_observer_present": {"const": false},
        "schema_version": {"const": "contextguard-receipt-evidence-boundary/v1"},
        "selected_branch": {"const": "S2-UNSUPPORTED"},
        "selected_transport": {"const": "NONE"},
        "stage1_evidence": {"const": false},
        "stage2_evidence": {"const": false}
      },
      "required": ["evidence_class", "host_request_owned", "provider_claim_authority", "provider_join_status", "runtime_observer_present", "schema_version", "selected_branch", "selected_transport", "stage1_evidence", "stage2_evidence"],
      "type": "object"
    }
  },
  "$id": "https://context-guard.local/schemas/expansion-refusal-v1.json",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "additionalProperties": false,
  "properties": {
    "artifact_kind": {"const": "expansion_refusal"},
    "evidence_boundary": {"$ref": "#/$defs/evidence_boundary"},
    "reason": {"enum": ["capability_rejected", "store_unavailable", "artifact_invalid", "root_unavailable", "root_state_changed", "source_changed"], "type": "string"},
    "schema_version": {"const": "contextguard-receipt-expansion-refusal/v1"},
    "status": {"enum": ["refused", "stale"], "type": "string"}
  },
  "required": ["artifact_kind", "evidence_boundary", "reason", "schema_version", "status"],
  "title": "Context Guard Receipt expansion refusal",
  "type": "object"
}