review fixes: in-suite, version bump, default children method

Fixes from subagent review:
- render-tests.lisp: added (in-suite box-suite) — tests were registered
  to default suite, never executed by runner
- dirty-tests.lisp: same fix
- cl-tui.asd: version 0.2.0 → 0.3.0
- render.lisp: component-children default method (c t) nil for
  protocol completeness (component-parent already had this)

cl-tui.asd

@@ -2,7 +2,7 @@
 (asdf:defsystem :cl-tui
   :description "Reusable Common Lisp Terminal UI Framework"
   :author "Amr Gharbeia"
-  :version "0.2.0"
+  :version "0.3.0"
   :license "TBD"
   :depends-on (:fiveam)
   :components