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.

org/channel-tui-main.org

@@ -910,12 +910,8 @@ Event handlers + daemon I/O + main loop.
         ;; breaks read on fd 0 in this SBCL environment, but -echo alone
         ;; works. A cat subprocess inherits the terminal and provides
         ;; bytes through a pipe that SBCL reads reliably.
-         ;; Enable character-at-a-time input (-icanon) so Ctrl+P/B
-         ;; arrive as individual bytes instead of being buffered.
-         ;; SBCL now reads from cat's pipe, not directly from fd 0,
-         ;; so -icanon doesn't trigger the SBCL read block issue.
-         (uiop:run-program '("stty" "-icanon" "-echo")
-                           :output nil :ignore-error-status t)
+         ;; stty -icanon -echo is set by the bash script before exec sbcl.
+         ;; A cat subprocess reads keyboard input from the terminal.
          (let* ((cat-proc (uiop:launch-program '("cat")
                                               :output :stream
                                               :input :interactive