native renderer: game world at MT_RENDER_SCALE (0.75 on Android), MSAA default 2

Draws recorded inside CPythonApplication::RenderGame are marked Render3DDraw::scene and
drawn by a scene pass compatible with pass_ into a reduced-resolution image, composited
where RenderGame drew; the UI stays full resolution. --render-scale / MT_RENDER_SCALE,
desktop default 1.0 (unchanged path).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/platform/UserInterface/PythonApplication.cpp

@@ -202,6 +202,8 @@ void CPythonApplication::GetMousePosition(POINT* ppt)
 void CPythonApplication::RenderGame()
 {
 	MtPerf::CScope kPerf(MtPerf::SECTION_RENDER_GAME);
+	// PORT: marks the world's draws so the native renderer can draw them at a reduced resolution.
+	struct SceneScope { SceneScope() { Render3DBeginScene(); } ~SceneScope() { Render3DEndScene(); } } kScene;
 	float fAspect=UI::CWindowManager::Instance().GetAspect();
 	float fFarClip=CPythonBackground::Instance().GetFarClip();