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/EterLib/RecordingDevice.cpp

@@ -15,6 +15,7 @@
 namespace {
 std::mutex g_draws_mutex;
 std::vector<Render3DDraw> g_draws;
+bool g_in_scene = false;
 int g_native_terrain_override = -1;
 bool g_gpu_render_targets = false;
 
@@ -1256,9 +1257,13 @@ void Render3DBeginFrame()
 void Render3DAdd(Render3DDraw draw)
 {
 	std::lock_guard<std::mutex> lock(g_draws_mutex);
+	draw.scene = g_in_scene;
 	g_draws.push_back(std::move(draw));
 }
 
+void Render3DBeginScene() { g_in_scene = true; }
+void Render3DEndScene() { g_in_scene = false; }
+
 const std::vector<Render3DDraw>& Render3DDraws() { return g_draws; }
 
 // D3D8 fixed-function texture coordinate processing for one stage (the native renderer's