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897f50e430
Two real Alpine containers on an isolated instance, addressed the way a GNS3 user does it (the node's persistent /etc/network/interfaces, applied by init.sh) and driven through the Docker daemon socket the server itself uses. Four scenarios: * fast path: the per-link kernel bridge enslaves exactly the two veth host ends, real ICMP crosses, the L2-anchor spec E.1/E.2 assertions hold (idle silence measured with the guests' links down -- a container's own boot-time IGMP report re-fires ~10 s later, so silencing is not just IPv6), netem delay, suspend/resume, capture, link delete/re-create, container stop/start (the veth host ends die with the adapter and are rebuilt from the NIO), zero residue on project delete; * filter matrix, one type at a time, each asserted through real traffic and its tc state: netem core (delay, jitter+distribution, loss, corrupt, duplicate), the extensions (reorder+correl+gap, seed+limit, gemodel, rate), cls_bpf match-drop including a byte-size discriminator, the eBPF classifier (frequency_drop every-Nth and -1, quota byte-cap cutoff, window_drop single outage with per-seq pass/drop/pass evidence), plus available_filters offering the kernel-only types; * relay control: no per-link bridge, the kernel-only types hidden; * relay->kernel reopen upgrade: the datapath choice is flipped across a server restart and the project reopened -- the link is rebuilt on the kernel datapath and forwards. The harness gains a Docker guest driver (a stdlib Engine API client over the daemon socket: exec with stream demux, container id by deterministic name -- the controller's node payload does not carry it, image inspect), a digest-pinned image helper (cache hit = no network, miss = pull through the server's own route, neither = skip) and Server.restart() for the reopen scenario (which also needs the local compute's capabilities to be up before a project open is accepted). Live: 4/4 scenarios, 142 s for the file; full e2e suite 10/10 (1503 s); unit suite 2149 passed; ruff clean. The matrix measures loss with 20 packets at 0.2 s spacing (143 s -> 58 s) and the jitter RTT assertion keeps statistical margin (per-direction N(50,20); 10 packets, >= 65 ms).