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806afec0d8
Eligibility gains an IOU branch gated on the compute's ubridge_iol_tap (strict True: an unreported capability keeps the link on the relay), and a port-level rule: a kernel link is an Ethernet segment, so any endpoint whose port is not Ethernet (IOU serial) disqualifies the link before it is dispatched. Without that, a serial link between two capable IOU nodes would be sent as nio_bridge and fail at the compute. The IOU NIO routes accept nio_bridge alongside the UDP/TAP/Ethernet NIOs — without the widening the controller's POST is 422'd before the node ever sees it, the same trap the QEMU routes hit.