feat(srp): add renderer-driven pipeline backbone

Introduce renderer-driven and renderer-backed managed pipeline base types in the Universal package.

Move shared renderer-data/default-renderer ownership out of UniversalRenderPipelineAsset, migrate probe assets onto the generic seam, and expose renderer recording/request context types for future SRP expansion.

Update scripting API-surface expectations and validate with build, unit tests, scripting tests, and old editor smoke.

managed/XCEngine.ScriptCore/Rendering/Universal/UniversalRenderPipelineAsset.cs

@@ -4,170 +4,18 @@ using XCEngine.Rendering;
 namespace XCEngine.Rendering.Universal
 {
     public class UniversalRenderPipelineAsset
-        : ScriptableRenderPipelineAsset
+        : RendererBackedRenderPipelineAsset
     {
-        public ScriptableRendererData[] rendererDataList =
-            new ScriptableRendererData[]
-            {
-                new UniversalRendererData()
-            };
-        public int defaultRendererIndex = 0;
-
-        protected override ScriptableRenderPipeline CreatePipeline()
+        protected override ScriptableRenderPipeline
+        CreateRendererBackedPipeline()
         {
-            return GetDefaultRendererData() != null
-                ? new UniversalRenderPipeline(this)
-                : null;
+            return new UniversalRenderPipeline(this);
         }
 
-        protected override void ConfigureCameraRenderRequest(
-            CameraRenderRequestContext context)
+        protected override ScriptableRendererData
+        CreateDefaultRendererData()
         {
-            ScriptableRendererData resolvedRendererData =
-                GetDefaultRendererData();
-            if (resolvedRendererData != null)
-            {
-                resolvedRendererData.ConfigureCameraRenderRequestInstance(
-                    context);
-            }
-        }
-
-        protected override void ConfigureCameraFramePlan(
-            ScriptableRenderPipelinePlanningContext context)
-        {
-            ScriptableRendererData resolvedRendererData =
-                GetDefaultRendererData();
-            if (resolvedRendererData != null)
-            {
-                resolvedRendererData.ConfigureCameraFramePlanInstance(
-                    context);
-            }
-        }
-
-        protected override string GetPipelineRendererAssetKey()
-        {
-            ScriptableRendererData resolvedRendererData =
-                GetDefaultRendererData();
-            return resolvedRendererData != null
-                ? resolvedRendererData.GetPipelineRendererAssetKeyInstance()
-                : string.Empty;
-        }
-
-        protected override void ReleaseRuntimeResources()
-        {
-            ReleaseRendererDataRuntimeResources();
-        }
-
-        internal ScriptableRendererData GetDefaultRendererData()
-        {
-            return GetRendererData(defaultRendererIndex);
-        }
-
-        internal ScriptableRenderer GetDefaultRenderer()
-        {
-            return GetRenderer(defaultRendererIndex);
-        }
-
-        internal ScriptableRendererData GetRendererData(
-            int rendererIndex)
-        {
-            EnsureRendererDataList();
-            int resolvedRendererIndex =
-                ResolveRendererIndex(rendererIndex);
-            if (rendererDataList[resolvedRendererIndex] == null)
-            {
-                rendererDataList[resolvedRendererIndex] =
-                    new UniversalRendererData();
-            }
-
-            return rendererDataList[resolvedRendererIndex];
-        }
-
-        internal ScriptableRenderer GetRenderer(
-            int rendererIndex)
-        {
-            ScriptableRendererData rendererData =
-                GetRendererData(rendererIndex);
-            return rendererData != null
-                ? rendererData.GetRendererInstance()
-                : null;
-        }
-
-        private void EnsureRendererDataList()
-        {
-            if (rendererDataList != null &&
-                rendererDataList.Length > 0)
-            {
-                return;
-            }
-
-            rendererDataList =
-                new ScriptableRendererData[]
-                {
-                    new UniversalRendererData()
-                };
-            defaultRendererIndex = 0;
-        }
-
-        protected void ReleaseRendererDataRuntimeResources()
-        {
-            EnsureRendererDataList();
-
-            for (int i = 0; i < rendererDataList.Length; ++i)
-            {
-                ScriptableRendererData rendererData =
-                    rendererDataList[i];
-                if (rendererData == null ||
-                    WasRendererDataReleasedEarlier(i))
-                {
-                    continue;
-                }
-
-                rendererData.ReleaseRuntimeResourcesInstance();
-            }
-        }
-
-        private bool WasRendererDataReleasedEarlier(
-            int rendererDataIndex)
-        {
-            ScriptableRendererData rendererData =
-                rendererDataList[rendererDataIndex];
-            for (int i = 0; i < rendererDataIndex; ++i)
-            {
-                if (object.ReferenceEquals(
-                        rendererDataList[i],
-                        rendererData))
-                {
-                    return true;
-                }
-            }
-
-            return false;
-        }
-
-        private int ResolveRendererIndex(
-            int rendererIndex)
-        {
-            EnsureRendererDataList();
-            if (rendererIndex < 0 ||
-                rendererIndex >= rendererDataList.Length)
-            {
-                return ResolveDefaultRendererIndex();
-            }
-
-            return rendererIndex;
-        }
-
-        private int ResolveDefaultRendererIndex()
-        {
-            EnsureRendererDataList();
-            if (defaultRendererIndex < 0 ||
-                defaultRendererIndex >= rendererDataList.Length)
-            {
-                defaultRendererIndex = 0;
-            }
-
-            return defaultRendererIndex;
+            return new UniversalRendererData();
         }
     }
 }