OptionaldatasetFor dataset: <dataset>
The trailing <documentId> part — what _id of the target doc is
Full GDR URI — resource-qualified identity, for round-trip / snapshot keying.
OptionalprojectFor dataset: <projectId>
OptionalresourceFor canvas / media-library / dashboard: <resourceId>
Target doc's schema _type.
A document the reactive layer should subscribe to, with its GDR exploded so consumers never re-parse: the resource-addressing parts (from ParsedGdr), the round-trip
globalDocumentIdURI, and the target doc's schema_type. The resource parts let an adapter detect refs pointing at a project/dataset/resource it isn't configured for;typefeeds per-doc handles (useDocument/editState).