{"schema_version":"1.0","status":"portable-contract","encoding":"UTF-8 JSON","required_sections":["envelope","lineage","claims","evidence","relations","nulls","conflicts","confidence_history","aliases","integrity"],"envelope_requires":["stable_id","record_type","created_at","author_or_agent","source_system","schema_version"],"integrity_requires":["content_hash","immutable_parent_ids","transform_history"],"compatibility_rule":"Unknown fields must be preserved; unsupported meanings must be reported, not silently discarded.","ontology_rule":"Operational usefulness and claims about fundamental existence remain separately typed."}