The manager that holds widgets is the WidgetManager

UIManager named the category, not the contents. Every other manager is
named after what it registers — ItemManager holds Items, SceneManager
holds Scenes — so the one that registers Widgets is the WidgetManager.

The alias, the Game field and both manual pages move together.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

core.dsl.go

@@ -16,7 +16,7 @@ func Run(g *Game) error {
 	}
 	// If the domain didn't register any widgets, fall back to the SCUMM
 	// preset so the game is still playable.
-	if g.UIManager.Len() == 0 {
+	if g.WidgetManager.Len() == 0 {
 		RegisterDefaultUI(g)
 	}