Artifact identityStable ids, kinds, status, media types, byte refs, hashes, and ownership boundaries.
Parts and blocksStructured document blocks, media parts, files, ranges, selectors, attachments, and render hints.
Versions and diffsSnapshots, operations, change summaries, semantic diffs, and reversible update facts.
Export and handoffRender manifests, export manifests, redaction state, provenance refs, and peer-agent package boundaries.