feat(menu): make Configure and Build reachable from the default menu

The config wizard (ccfe config) and object builder (ccfe builder) were
only reachable as top-level shortcuts -- nothing in the browsable menu
tree linked to them, so a user opening 'ccfe' could not discover them.
The default ccfe.menu now lists Demo, Configure CCFE (menu:config), Build
menus and forms (menu:builder) and the install test, so configuration is
reachable by navigation. Targets parse; t/03/t/07 green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: claude

src/ccfe.menu

@@ -1,13 +1,26 @@
 title {
-  CCFE Installation Test
+  CCFE
 }
-item {
-  id     = TEST
-  descr  = SELECT ME!!!
-  action = run:cat it_works.txt
+top {
+  Move the cursor to an item and press Enter.
 }
 item {
   id     = DEMO
-  descr  = CCFE demo menu
+  descr  = Demo menu (sample menus and forms)
   action = menu:demo
 }
+item {
+  id     = CONFIG
+  descr  = Configure CCFE (settings, variables)
+  action = menu:config
+}
+item {
+  id     = BUILD
+  descr  = Build menus and forms
+  action = menu:builder
+}
+item {
+  id     = TEST
+  descr  = Installation test (it works!)
+  action = run:cat it_works.txt
+}