review fixes: version bump, keyword check, warning assertion

Fixes from subagent review:
- ASDF version 0.3.0 → 0.4.0
- define-preset now checks (check-type name keyword) at macro-expand time
- load-preset-unknown-warns test now uses (signals warning ...) to
  actually verify the warning fires (was false-positive before)

cl-tui.asd

@@ -2,7 +2,7 @@
 (asdf:defsystem :cl-tui
   :description "Reusable Common Lisp Terminal UI Framework"
   :author "Amr Gharbeia"
-  :version "0.3.0"
+  :version "0.4.0"
   :license "TBD"
   :depends-on (:fiveam)
   :components