Preserve operation ownership in terminal observations

docs/internal/observation.md

@@ -10,6 +10,10 @@ lifecycle instrumentation spans the facade and runner boundaries.
 Prepared execution starts only after its private payload is atomically claimed;
 the facade receives that invocation's recorder privately and emits the terminal
 event after public error mapping. Failed claims and preparation emit nothing.
+The public projection retains private operation-owner metadata separately from
+inspectable child causes. Terminal classification uses that owner, preserving
+context precedence and generation-specific transport/provider details rather
+than mistaking a collaborator's nested lookup error for the parent's operation.
 
 The facade masks inherited recorder and prepared-claim state when entering
 preparation or execution. Delegated calls from an injected collaborator retain