Plugins get a host-owned WebSocket resource (net.websocket-connect → websocket with id/send/drain/close; dropping it closes the transport). The connection is bound to the project it was opened for, needs the endpoint's net:<host> grant, uses WSS outside loopback with the shared rustls config, and is capped at eight per plugin. Request headers (secret placeholders expanded) go with the handshake, except the ones the handshake owns; an empty subprotocol requests none; the handshake is bounded by the call's I/O budget. Incoming frames queue in a bounded FIFO, signalled by the websocket-ready event. Checked-in components are rebuilt for API 1.6.
Co-authored-by: SorPuti <56741582+SorPuti@users.noreply.github.com>