Reject incompatible provider asset catalogs

packages/org.gamecult.eve.unity-scene/Runtime/CultMesh/EveUnityCultMeshLiveProviderTransport.cs

@@ -531,6 +531,16 @@ namespace GameCult.Eve.UnityScene
                 })
                 .Where(selection => selection.Variant != null)
                 .ToArray();
+            if (selected.Length == 0)
+            {
+                var advertisedVariants = catalog.Assets
+                    .SelectMany(asset => asset.Variants.Select(variant =>
+                        $"{asset.AssetRef}:{variant.RuntimeId}/{variant.Platform}"))
+                    .ToArray();
+                throw new InvalidOperationException(
+                    $"Provider asset catalog '{catalog.CatalogId}' has no unity-scene/{CurrentBundlePlatform()} variant. " +
+                    $"Advertised variants: {string.Join(", ", advertisedVariants)}");
+            }
             ReadCameraPolicies(selected.Select(selection => selection.Variant!));
             foreach (var group in selected.GroupBy(selection => selection.Variant!.Uri, StringComparer.Ordinal))
             {

packages/org.gamecult.eve.unity-scene/package.json

@@ -1,7 +1,7 @@
 {
     "name": "org.gamecult.eve.unity-scene",
     "displayName": "Eve Unity Scene Lowering",
-    "version": "0.3.6",
+    "version": "0.3.7",
     "unity": "2021.3",
     "description": "Provider-agnostic Unity scene shell for gamecult.eve.surface.v1 interactive world surfaces.",
     "dependencies": {