Function raw_partial_lit

ds4_server.c:5199–5203

     * a reasoning-only incomplete turn and the client replays the history. */
    if (pending_reasoning.len) {
        chat_msg msg = {0};
        msg.role = xstrdup("assistant");
        msg.content = xstrdup("");
        msg.reasoning = buf_take(&pending_reasoning);
        chat_msgs_push(msgs, msg);
    }
    buf_free(&pending_reasoning);
    return true;