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- Return parent_decision_id in handler result dict and add meaningful assertion to the corresponding Behave scenario (B1) - Add ULID format validators to SubplanPayload for plan_id, dependencies, and parent_decision_id, consistent with Decision model validation (S1) - Add non-empty string validator for resource_scopes items (S2) - Narrow broad except Exception to except (ValidationError, ValueError) so programming errors surface as real failures (S3) - Document strategy_with_subplan.yaml in actors_examples.md and assert it is referenced in the "Verify all examples are documented" scenario (B2) ISSUES CLOSED: #198