Playertest: scene/script system refactor and Wii ABI fix

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

assets/scenes/cube.lua

@@ -0,0 +1,30 @@
+local Cube = include('entities/cube.lua')
+
+local SceneCube = {}
+SceneCube.__index = SceneCube
+
+local cam
+local cube
+
+function SceneCube:init()
+  cam = Entity.new()
+  cam:add(Entity.POSITION)
+  cam.position.x = 3
+  cam.position.y = 3
+  cam.position.z = 3
+  cam.position:lookAt(0, 0, 0)
+  cam:add(Entity.CAMERA)
+
+  cube = Cube.new()
+end
+
+function SceneCube:update()
+  cube:update()
+end
+
+function SceneCube:dispose()
+  cam:dispose()
+  cube:dispose()
+end
+
+return SceneCube