direct_conversation_root_mask_violation· reason_code· applies to event_envelope, auth_decisionThe ak.self.events.command.submit.v1 technical-root phase-mask stage rejected an operational, grant, member-governance, policy, or terminal action outside the exact active Direct Conversation founding/materialization mask. Root owner aggregation cannot bypass participant authority or target the other participant. The rejection writes nothing; see contract-registry.json operation_registry.direct_conversation_admission_mappings.