fix: set stty -icanon -echo in bash script before exec sbcl

uiop:run-program inside SBCL can't access the terminal, so stty
calls from within Lisp fail silently. By running 'stty -icanon -echo'
in the bash script before exec sbcl, the terminal is already in
character-at-a-time mode when the TUI starts, and Ctrl+P/B keys
arrive as individual bytes through the cat pipe.

passepartout

@@ -410,6 +410,9 @@ LISPEOF
         # (SBCL strips COLUMNS/LINES but leaves MY_* alone).
         ts=$(stty size 2>/dev/null)
         export MY_TERM_ROWS="${ts%% *}" MY_TERM_COLS="${ts##* }"
+        # Set character-at-a-time mode BEFORE SBCL starts
+        # (uiop:run-program inside SBCL can't access the terminal)
+        stty -icanon -echo 2>/dev/null
         # 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