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4fc0398423
Two Alpine containers on a kernel-only link with traffic-insight markers attached to a veth anchor (marker add_kernel), observed on the dedicated marker WebSocket via a new harness piece (WebSocketCollector, a sync facade over websockets' sync client). Real ICMP proves: the marker.match identity is complete (filter/tag/link_id/capture node/ts/len and the tx/rx direction set of a ping), the main project channel carries no matches, the BPF and direction are enforced (a non-matching sibling and a tx-only marker each see exactly their traffic), the host pcap holds exactly the matched frames, pausing silences one marker while a sibling keeps counting (silence is never a dead channel), tag replay serves the paused tag's timeline with display-filter/link/window narrowing and refuses with 409 while capturing, and deleting a marker takes its pcap and signals with it.