fix: restore backend info message, remove Connected chat message

Backend dimensions needed to be readable. Connected v0.7.2
was accidentally restored by git checkout — removed again.

org/channel-tui-main.org

@@ -706,8 +706,7 @@ Event handlers + daemon I/O + main loop.
       (text (setf (st :busy) nil)
             (add-msg :agent text :gate-trace gate-trace))
       ((eq action :handshake)
-       (setf (st :daemon-version) (getf payload :version))
-       (add-msg :system (format nil "Connected v~a" (getf payload :version))))
+       (setf (st :daemon-version) (getf payload :version)))
       (t (add-msg :agent (format nil "~a" msg))))))
 #+END_SRC
 
@@ -918,6 +917,10 @@ Event handlers + daemon I/O + main loop.
                                               :stderr nil))
                (tty-in (uiop:process-info-output cat-proc)))
           (add-msg :system (format nil "* cat pid=~a *" (uiop:process-info-pid cat-proc)))
+          ;; Log backend info and terminal dimensions
+          (let ((backend-type (if (typep be 'cl-tty.backend:modern-backend)
+                                  "modern" "simple")))
+            (add-msg :system (format nil "* ~a backend ~dx~d *" backend-type w h)))
           ;; Guard against nil w/h from backend-size
           (setq w (or (and (numberp w) (> w 0) w) 80)
                 h (or (and (numberp h) (> h 0) h) 24))