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Flow Debugger (design 2026-09-05 §5.2/§5.4): Trace rides beside ParentExecutionId on RouteToCallRequest/RouteToSetAttributesRequest/ScriptCallRequest/SetStaticAttributeCommand/ AttributeValueChanged; RouteToCallResponse and ScriptCallResult carry the site run's ExecutionId and its ScriptTrace AuditEvents inline. All trailing optional — zero call-site edits. Claude-Session: https://claude.ai/code/session_01GSLkkHKz9JrAtmJjmQK3cP