refactor(srp): let universal assets declare native backend keys

tests/Rendering/unit/test_camera_scene_renderer.cpp

@@ -11,6 +11,7 @@
 #include <XCEngine/Rendering/Execution/CameraRenderer.h>
 #include <XCEngine/Rendering/Execution/RenderPipelineHost.h>
 #include <XCEngine/Rendering/Graph/RenderGraph.h>
+#include <XCEngine/Rendering/Pipelines/BuiltinForwardPipeline.h>
 #include <XCEngine/Rendering/Pipelines/ManagedScriptableRenderPipelineAsset.h>
 #include <XCEngine/Rendering/Pipelines/ScriptableRenderPipelineHost.h>
 #include <XCEngine/Rendering/RenderPassGraphContract.h>
@@ -22,6 +23,7 @@
 #include <XCEngine/Scene/Scene.h>
 
 #include "Rendering/Execution/Internal/CameraFrameGraph/SurfaceResolver.h"
+#include "Rendering/Internal/RenderPipelineFactory.h"
 #include <functional>
 #include <memory>
 #include <string>
@@ -4508,6 +4510,39 @@ TEST(ScriptableRenderPipelineHost_Test, BindsCurrentPipelineRendererIntoStageRec
         host.GetPipelineRenderer());
 }
 
+TEST(
+    RenderPipelineFactory_Test,
+    NullPreferredAssetSkipsConfiguredManagedPipelineAssetWhenCreatingNativeSceneRenderer) {
+    Pipelines::ClearManagedRenderPipelineBridge();
+    Pipelines::ClearConfiguredManagedRenderPipelineAssetDescriptor();
+
+    const Pipelines::ManagedRenderPipelineAssetDescriptor descriptor = {
+        "GameScripts",
+        "Gameplay",
+        "ManagedRenderPipelineProbeAsset"
+    };
+    auto bridgeState = std::make_shared<MockManagedRenderPipelineBridgeState>();
+    Pipelines::SetManagedRenderPipelineBridge(
+        std::make_shared<MockManagedRenderPipelineBridge>(bridgeState));
+    Pipelines::SetConfiguredManagedRenderPipelineAssetDescriptor(descriptor);
+
+    std::shared_ptr<const RenderPipelineAsset> resolvedAsset = nullptr;
+    std::unique_ptr<NativeSceneRenderer> sceneRenderer =
+        Internal::CreateNativeSceneRendererFromAsset(
+            nullptr,
+            &resolvedAsset);
+
+    ASSERT_NE(sceneRenderer, nullptr);
+    EXPECT_EQ(resolvedAsset, nullptr);
+    EXPECT_NE(
+        dynamic_cast<Pipelines::BuiltinForwardPipeline*>(sceneRenderer.get()),
+        nullptr);
+    EXPECT_EQ(bridgeState->createAssetRuntimeCalls, 0);
+
+    Pipelines::ClearConfiguredManagedRenderPipelineAssetDescriptor();
+    Pipelines::ClearManagedRenderPipelineBridge();
+}
+
 TEST(
     ScriptableRenderPipelineHost_Test,
     FallsBackToRendererWhenStageRecorderDeclinesRecording) {