Function handle_viewer_feed 

async fn handle_viewer_feed(
    __arg0: State<AppState>,
    __arg1: Extension<ViewerCaller>,
    __arg2: Path<String>,
    headers: HeaderMap,
) -> Response

GET /agentmux/viewer/agents/:name/feed: the agent’s transcript as Server-Sent Events (see feed_stream). 404 for an agent that isn’t this channel’s or is hidden; 503 past the feed caps.