fix: remove useless export COLUMNS/LINES from script

SBCL strips these from the environment regardless.

passepartout

@@ -406,12 +406,6 @@ case "$COMMAND" in
   (sleep 3) (finish-output) (uiop:quit 1))))
   (passepartout.channel-tui:tui-main))
 LISPEOF
-        # Set terminal dimensions from stty — bash's $COLUMNS/$LINES
-        # are often missing or not exported. stty size always works.
-        local ts=$(stty size 2>/dev/null)
-        export COLUMNS="${ts#* }" LINES="${ts% *}"
-        [ -z "$COLUMNS" ] && COLUMNS=80
-        [ -z "$LINES" ] && LINES=24
         # Clear stale cl-tty cache to ensure latest backend-size fixes
         find ~/.cache/common-lisp -name "*.fasl" -path "*cl-tty*" -delete 2>/dev/null
         exec sbcl --noinform --load /tmp/tui-load.lisp