fix: setup wizard non-interactive safe, TUI script daemon detection + timing

org/system-config.org

@@ -98,10 +98,11 @@ Creates the config directory tree if it does not exist.
 ;; REPL-VERIFIED: 2026-05-03T13:00:00
 #+begin_src lisp
 (defun prompt (prompt-text)
-  "Simple prompt that returns user input as a string."
+  "Simple prompt that returns user input as a string.
+Returns nil if stdin is non-interactive."
   (format t "~a" prompt-text)
   (finish-output)
-  (read-line))
+  (ignore-errors (read-line)))
 
 #+end_src
 ** prompt-yes-no