Remove public managed scene injection point

engine/include/XCEngine/Rendering/AGENTS.md

@@ -152,3 +152,7 @@ Guardrails:
   `ScriptableRenderPipelineAsset`, owns renderer-data selection and runtime
   resource lifecycle itself, and creates `UniversalRenderPipeline` directly.
   The deleted bridge types must remain absent from the public API surface.
+- Removed the public managed `SceneRenderInjectionPoint` type. Native scene
+  injection points remain internal built-in scene-recorder detail; managed SRP /
+  URP authors should use `RenderPassEvent`, renderer blocks, renderer-list draw
+  APIs, and RenderGraph declarations instead.