find By Source Revision
open fun findBySourceRevision(contextId: <Error class: unknown class>, ref: SourceRevisionRef): List<Proposition>
Find propositions in contextId with evidence from exactly ref's source key and revision.
abstract fun findBySourceRevision(contextIdValue: String, ref: SourceRevisionRef): List<Proposition>
findBySourceRevision by plain context-id string — the implementation point, and what Java callers use.