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1542a222f4
The persistent-TAP lifecycle — probe, sweep, create, register, delete — was implemented four times, once per node type, and the copies had drifted (probe mechanism, _tap_datapath reset, keep-vs-recreate policy). The mechanical half moves into KernelDatapathMixin: - _probe_persistent_taps(probe_name): the scratch-TAP probe, returning the refusal for the caller's own warning (QEMU, Dynamips); - _create_anchor_taps(ports, set_owner, keep_existing): sweep + create + optional ownership handover + carrier down + registry, with the ports enumerated by the node type and named through the new _tap_name hook; - _delete_anchor_taps(): the suppressed tap sweep + per-link bridge cleanup + registry clear. Each node type keeps what its fd holder dictates: the release step before the tap sweep (the QEMU process, the IOL bridge, the hypervisor's NIO bindings, the container port bridges), its probe policy, and its registry lifetime. QEMU's now-unconditional registry clear aligns it with the other three; everything else is behavior-preserving.