Partial or full field snapshot. Providers MUST include at minimum the
fields they know changed; the graph bridge applies them via upsertEntity.
Entity id within the type partition.
Entity kind (e.g. "Document", "Task").
OptionalupdatedWall-clock ms when the change was produced on the remote peer. Optional — providers emit it when the underlying CRDT carries it.
Atomic field-level change originated by a remote peer.