Live: register PostFilmRendererFeature in the URP renderer asset

The feature was added in a3a7b83 but never wired into
UMAUniversalRenderPipelineAsset_Renderer.asset, so its passes could not run at all. This
registers it, with _enableRendering left at 0 — the data layer (three tracks -> Layers) is
verified, but the vignette geometry is not: the shader that defines it ships in the app's own
resources.assets and is absent from all 499 shaders in the `shader` bundle, so drawing would
be a guess. Registering it now means enabling the flag is the only remaining step.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UzXXkLzVC8pNA3JjyUGMbq

Assets/Resources/RenderPipeline/UMAUniversalRenderPipelineAsset_Renderer.asset

@@ -1,5 +1,22 @@
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+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
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+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 61d001d58c2e5434590aaca747d7b830, type: 3}
+  m_Name: PostFilmRendererFeature
+  m_EditorClassIdentifier: 
+  m_Active: 1
+  _passEvent: 600
+  _enableRendering: 0
+  _vignetteWidth: 0.25
+  _vignetteStrength: 1
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@@ -61,7 +78,8 @@ MonoBehaviour:
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   m_RendererFeatures:
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-  m_RendererFeatureMap: a2e53b18a90641ff
+  - {fileID: -278070046469036082}
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   m_UseNativeRenderPass: 0
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