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The relay engines' observable paths had no live coverage: every capture/start call in the suite sat on a kernel anchor (AF_PACKET capture start_kernel) and markers were only asserted on marker add_kernel. The two relay engines' own command shapes were unit-tested only: * bridge engine - bridge start_capture / bridge add_packet_filter ... mark * iol_bridge engine - iol_bridge start_capture / iol_bridge add_packet_filter ... mark Docker relay control (bridge engine, 1 passed 33s): the capture start REST call writes the ICMP exchange to a pcap off the relay bridge; a mark filter attached with capture_node_id n1 signals exactly 10 marker.match events over the dedicated marker WS for 5 pings (5 requests + 5 replies, both directions), carrying node_id/link_id/tag and the busybox frame length, writes exactly those 10 frames to the marker pcap, and deleting the marker takes the pcap with it. IOU relay control (iol_bridge engine, 1 passed 173s): the same two checks on iol_bridge start_capture and the port's mark filter, driven by the real IOS ping through the fabric socket relay. Not duplicated in the ESW/VPCS/cloud relay controls: they issue the same uBridge bridge commands through their own call sites, which stay covered by unit tests; the IOL container relay goes through the same iol_bridge engine already exercised here.