Fixture: subgraph-depth-1

Source: https://heratio.theahg.co.za/api/ric/v1/graph?uri=https://heratio.theahg.co.za/informationobject/egyptian-boat&depth=1

A 1-hop subgraph rooted at a RecordSet. Exercises: openric:Subgraph envelope, node/edge primitives, the six graph invariants from graph-primitives.md §6, canonical rico:* predicates on every edge.

Validation: expected.jsonld MUST validate against the schema selected by its @type.