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_choose_capture_side prefers BUILTIN_NODE_TYPES which includes ethernet_switch/ethernet_hub/NAT etc. — nodes that do not use uBridge and therefore have no bridge for a marker filter to attach to. Add _choose_marker_side with a _MARKER_UNSUPPORTED_TYPES blocklist so marker capture-side selection skips NIO-only switches and picks the uBridge-backed node (VPCS/QEMU/Docker/etc.) instead. Verified end-to-end: PC1↔Switch↔PC2 links with arp markers correctly pick VPCS nodes; MARK signals flow through to WebSocket and pcaps are written.