refactor(srp): move render scene setup into managed urp

docs/used/SRP_UniversalRenderSceneSetupPolicyManagedOwnershipPlan_完成归档_2026-04-21.md

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+# SRP Universal Render Scene Setup Policy Managed Ownership Plan 2026-04-21
+
+## Goal
+
+Move render-scene setup policy selection out of native `RenderPipeline` hardcoded defaults and into managed URP renderer-data ownership.
+
+This stage still keeps the actual `RenderSceneData` population native.
+It only makes managed URP explicitly choose which native scene-setup policy asset key should be used.
+
+## Why This Stage
+
+The current SRP split already moved:
+
+1. renderer selection into managed URP;
+2. builtin scene feature ownership into managed renderer features;
+3. shadow planning policy into managed URP asset ownership;
+4. shadow execution policy into managed URP renderer-data ownership;
+5. shadow-caster standalone pass selection into managed URP renderer-data ownership.
+
+But `RenderPipeline::ConfigureRenderSceneData()` still directly hardcodes:
+
+1. global shader keyword setup;
+2. environment / skybox setup.
+
+That means managed URP still cannot explicitly own how extracted scene data is finalized before the renderer consumes it.
+
+## Scope
+
+Included:
+
+1. add a native registry for render-scene setup policies;
+2. add managed asset / renderer-data API for render-scene setup policy asset keys;
+3. let Mono runtime resolve those keys from managed pipeline assets;
+4. let `ScriptableRenderPipelineHost` use managed-selected render-scene setup policy keys;
+5. make `UniversalRendererData` explicitly own the builtin render-scene setup policy key;
+6. rebuild `XCEditor` and run old editor smoke.
+
+Not included:
+
+1. exposing mutable `RenderSceneData` editing directly to C#;
+2. custom managed skybox authoring APIs;
+3. custom global shader keyword authoring APIs;
+4. changing render-scene extraction itself.
+
+## Acceptance
+
+This stage is complete when:
+
+1. managed URP explicitly owns render-scene setup policy selection;
+2. native host no longer blindly applies the default render-scene setup for managed pipelines;
+3. builtin scene setup still works for the default URP renderer;
+4. `XCEditor` build and old editor smoke both pass.
+
+## Result
+
+Completed on 2026-04-21.
+
+Validation:
+
+1. `cmake --build . --config Debug --target XCEditor` passed;
+2. old editor smoke passed with `editor/bin/Debug/XCEngine.exe`;
+3. `editor/bin/Debug/editor.log` recorded `SceneReady` at `2026-04-21 03:07:29`.