v0.8.3: remove startup info messages from chat history

Remove the add-msg :system calls that printed * Swank <port> * and
* <backend> backend WxH * — purely informational/debug messages
that cluttered the first lines of the chat window.

org/channel-tui-main.org

@@ -946,17 +946,13 @@ Returns T on success, nil on failure. Does NOT wait or retry."
                    (*error-output* (make-string-output-stream)))
                (funcall (find-symbol "CREATE-SERVER" "SWANK")
                         :port swank-port :dont-close t))
-             (add-msg :system
-                     (format nil "* Swank ~d  M-x slime-connect *" swank-port)))
+              (values))
         (error ()
           (add-msg :system "* Swank unavailable *"))))
     (cl-tty.backend:with-terminal (be w h)
-          ;; stty -icanon -echo -ixon is set by the bash script.
-          ;; We read directly from SBCL's stdin (fd 0) since the
-          ;; terminal is in raw mode — no cat subprocess needed.
-          (add-msg :system (format nil "* ~a backend ~dx~d *"
-                                   (if (typep be 'cl-tty.backend:modern-backend) "modern" "simple")
-                                   w h))
+           ;; stty -icanon -echo -ixon is set by the bash script.
+           ;; We read directly from SBCL's stdin (fd 0) since the
+           ;; terminal is in raw mode — no cat subprocess needed.
            ;; Initial dirty all to trigger first redraw in loop
            (setq w (or (and (numberp w) (> w 0) w) 80)
                  h (or (and (numberp h) (> h 0) h) 24))