find Revisionless By Source Locator
open fun findRevisionlessBySourceLocator(contextId: <Error class: unknown class>, locator: SourceLocator): List<Proposition>
Find propositions in contextId with revisionless evidence whose locator key equals locator's key.
Evidence carrying any revision is excluded.
abstract fun findRevisionlessBySourceLocator(contextIdValue: String, locator: SourceLocator): List<Proposition>
findRevisionlessBySourceLocator by plain context-id string — the implementation point, and what Java callers use.