refactor(lib): rely less on global state for defaults

I prefer to be more explicit about these variables' defaults, then to
rely on proper load order and unverified global state to ensure they're
properly set.

lisp/doom-cli.el

@@ -21,6 +21,9 @@
           doom-print-level 'debug)
     (message "Debug mode enabled"))
 
+  ;; FIX: All output via `message' should be seen as debug output.
+  (setq doom-print-message-level 'debug)
+
   ;; HACK: Load `cl' and site files manually to prevent polluting logs and
   ;;   stdout with deprecation and/or file load messages.
   (when noninteractive