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Anso
6893ece898
Lays the dormant data-plane foundation for Sencho Mesh. The pilot tunnel gains TCP forwarding frames (tcp_open / tcp_open_ack / tcp_close JSON plus a 0x04 TcpData binary type) and a TcpStream surface on the bridge so a future MeshService can ride the existing WSS tunnel for cross-node container traffic. The agent rejects every tcp_open with mesh_not_enabled until a follow-up PR wires the Dockerode resolver gated by a mesh_stacks opt-in table; ships dormant. A new top-level mesh-sidecar/ package provides the per-node container that will host the L4 forwarder + control WS in production. Built as a small Node 22 alpine image and published in lockstep with the main sencho image via a parallel docker-publish workflow job. Tests cover protocol roundtrips on both packages and the sidecar forwarder end-to-end including resolve, splice, close, and stats.