feat(rendering): pack scene dispatcher inputs

Capture immutable presentation payloads in the render scene, flatten unique entity and mesh-part records into the borrowed frame arena, and compare every routed dispatcher input tuple without changing the production draw source.

src/AcDream.App/Rendering/Scene/RenderProjectionRecordFactory.cs

@@ -80,7 +80,11 @@ internal static class RenderProjectionRecordFactory
                 fingerprint.Transform,
                 fingerprint.Geometry,
                 fingerprint.Appearance,
-                fingerprint.Flags));
+                fingerprint.Flags),
+            new RenderEntityPayload(
+                entity.MeshRefs,
+                entity.PaletteOverride,
+                entity.IsBuildingShell));
     }
 
     private static (Vector3 Minimum, Vector3 Maximum) CalculateBounds(