Class WSChatClient

Complete (non-streaming) message — slash command replies, errors, etc.

Server announced which chat mode is active.

Server broadcast a state patch (agent list updated, or agent deleted).

One streaming chunk from the LLM.

Stream finished — render final markdown, clear typing indicator.

Send a chat message over the WebSocket. Returns false when the socket is not open (caller can fall back to MQTT).

Send any raw JSON object over the WebSocket (e.g. agent commands). Returns false when the socket is not open.