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1cddeb8c3f
Add bugs/link-udp-self-loop.md: the intermittent one-way docker link observed during XRd validation (one end's nio_udp rport pointing at its own lport after a uBridge restart), with the evidence table, the uBridge console capture diagnostics, the delete/recreate workaround, and the narrowed suspects (batch port preallocation / link re-creation race). Also note that a docker node's in-container ethN is a TAP device held by uBridge (no veth host end exists). Update the XRd feature doc: datapath validated end-to-end (XRd brings its own interfaces up, ARP/ICMP bidirectional), add a troubleshooting row pointing at the bug doc. Index the bug in docs/README.md.