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81ad9b837f
uBridge delivered `link l2only` (e2e3155) and the brctl delete refusal (83a84fb); verified from the server side -- anchors and per-link bridges report addrgenmode none, carry no addresses, and an idle anchor is silent once the one-shot membership burst has settled. That burst is the one thing the command cannot remove, so it is now recorded where the acceptance criteria live, with the measurement: enslaving a port makes the kernel announce the bridge's multicast memberships (90 B MLDv2 at +0.00 s, 54 B IGMPv3 at +0.09 s, 90 B MLDv2 at +0.73 s, then silence; no addresses involved, and IPv4 has no per-device IGMP switch). Decision: accepted and documented, not suppressed -- §E.2 measures idle silence after a settle window instead. Pins the other delivered behaviour with a test: a bridge now survives a single-sided node stop, so brctl create answers EEXIST on the common path rather than only in a create race -- the attach must not short-circuit there, because the restarted side has a brand-new anchor whose filters and markers still have to be re-applied.