remove demo game

actor.animation.go

@@ -0,0 +1,10 @@
+package pncdsl
+
+// AnimationClip is a placeholder for sprite-sheet animation data. Not used
+// for rendering yet — characters draw as flat colored rectangles in this
+// milestone — but the field exists so domain code can reference it.
+type AnimationClip struct {
+	Frames     []Rectangle // source rects on the sprite sheet
+	FrameTime  float64
+	Loop       bool
+}