connect-to-a-node

Get vike-cli mcp talking to a running vike-tradehub node so node_snapshot and the order-write tools work. Use when the user asks to connect to a node, attach a laptop to a tradehub, run vike-cli node setup or vike-cli node connect, mint or rotate the node keys, point vike at a tradehub, set --node, configure VIKE_TRADEHUB_OBSERVE_KEY or VIKE_TRADEHUB_CONTROL_KEY, reach a remote node over an ssh tunnel, or when a…