whyExplain

The lineage behind the proposition with the given id, or null if it does not exist.

Routes to a native GraphQueryCapable store for unscoped queries, and for context-scoped queries when the store declares GraphQueryCapable.honorsContextFilter (passing the context so the backend treats a foreign-context proposition as absent); otherwise assembles the lineage from the proposition's durable fields (grounding, sources, reinforcement, status, temporal), scoped to this context.