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12d8abce45
Move the datapath-agnostic half of DockerKernelDatapathMixin into a new KernelDatapathMixin (compute/kernel_datapath.py) so a second node type can reuse it verbatim: the three marker primitives, the tc netem / cls_bpf / eBPF appliers, the uBridge tc-capability probe, kernel marker teardown, link detach, the per-link bridge cleanup and the adapter carrier -- plus _kernel_attach(), lifted from DockerVM._connect_nio's kernel branch. The mixin talks about "the anchor" (the host-side interface an adapter owns in the root namespace) instead of "the veth host end": a node type provides _kernel_host_ifc(), _kernel_anchors() and, when needed, _relay_carrier_bridge() and _kernel_error(). Docker keeps only the veth lifecycle and those hooks; behaviour is unchanged. The C901 baseline entry moves with _netem_command_parts (the docker module is no longer over the limit) and the bpf-compile-failure test patches the logger of the module that now owns the code -- net zero new ignores.