The loop opening the part's own membership's streams bound the part's durable on SEAT_node-engine_running beside hearRunning, so the event running went to either reader and the state running stayed empty at random (about 1 run in 15 under load). The loop now leaves that stream to hearRunning. The subtest that compares a consumer's ack floor before and after acked asynchronously and failed 1 run in 30; it now waits for the ack's reply. The failure of an until in the whole-part test also names what the part said of running. Builds: design 47 G §556, A-19 Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h