refactor(srp): unify mono recorder backend ownership

tests/Rendering/unit/test_camera_scene_renderer.cpp

@@ -441,10 +441,12 @@ struct MockPipelineAssetState {
 struct MockStageRecorderState {
     int initializeCalls = 0;
     int shutdownCalls = 0;
+    int setPipelineRendererCalls = 0;
     int recordMainSceneCalls = 0;
     bool supportsMainSceneRenderGraph = false;
     bool recordMainSceneResult = true;
     bool lastReceivedRenderGraphBlackboard = false;
+    RenderPipelineRenderer* lastPipelineRenderer = nullptr;
 };
 
 class MockPipeline final : public RenderPipeline {
@@ -688,6 +690,12 @@ public:
         ++m_state->shutdownCalls;
     }
 
+    void SetPipelineRenderer(RenderPipelineRenderer* pipelineRenderer)
+        override {
+        ++m_state->setPipelineRendererCalls;
+        m_state->lastPipelineRenderer = pipelineRenderer;
+    }
+
     bool SupportsStageRenderGraph(CameraFrameStage stage) const override {
         return SupportsCameraFramePipelineGraphRecording(stage) &&
                m_state->supportsMainSceneRenderGraph;
@@ -4477,6 +4485,29 @@ TEST(ScriptableRenderPipelineHost_Test, PrefersStageRecorderBeforeFallbackRender
     EXPECT_EQ(replacementRecorderState->shutdownCalls, 1);
 }
 
+TEST(ScriptableRenderPipelineHost_Test, BindsCurrentPipelineRendererIntoStageRecorder) {
+    auto initialPipelineState = std::make_shared<MockPipelineState>();
+    auto replacementPipelineState = std::make_shared<MockPipelineState>();
+    auto recorderState = std::make_shared<MockStageRecorderState>();
+
+    Pipelines::ScriptableRenderPipelineHost host(
+        std::make_unique<MockPipeline>(initialPipelineState));
+
+    host.SetStageRecorder(
+        std::make_unique<MockStageRecorder>(recorderState));
+    EXPECT_EQ(recorderState->setPipelineRendererCalls, 1);
+    EXPECT_EQ(
+        recorderState->lastPipelineRenderer,
+        host.GetPipelineRenderer());
+
+    host.SetPipelineRenderer(
+        std::make_unique<MockPipeline>(replacementPipelineState));
+    EXPECT_EQ(recorderState->setPipelineRendererCalls, 2);
+    EXPECT_EQ(
+        recorderState->lastPipelineRenderer,
+        host.GetPipelineRenderer());
+}
+
 TEST(
     ScriptableRenderPipelineHost_Test,
     FallsBackToRendererWhenStageRecorderDeclinesRecording) {