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cb7f74c77b
docker create_veth hardens only its FIRST end (the Docker shape: host anchor plus a container leg that keeps its L3 life). A cascade end is that second, unhardened end whenever the peer switch's create won the race, and the kernel gives it an IPv6 link-local — a silent L3 identity on the switch fabric (ubridge-l2-anchor-spec §E). Each switch now hardens its OWN end with 'link l2only <end> on' once the pair exists, whatever branch brought it there (fresh create, lost race, reuse); idempotent, and best-effort with a warning on a uBridge without the command.