Fix test failures - correct metadata registry mock to match runtime behavior

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

packages/foundation/core/src/app.ts

@@ -215,16 +215,14 @@ export class ObjectQL implements IObjectQL {
     }
 
     getObject(name: string): ObjectConfig | undefined {
-        const item = this.kernel.metadata.get<MetadataItem>('object', name);
-        return item?.content as ObjectConfig | undefined;
+        return this.kernel.metadata.get<ObjectConfig>('object', name);
     }
 
     getConfigs(): Record<string, ObjectConfig> {
         const result: Record<string, ObjectConfig> = {};
-        const items = this.kernel.metadata.list<MetadataItem>('object');
+        const items = this.kernel.metadata.list<ObjectConfig>('object');
         for (const item of items) {
-            const obj = item.content as ObjectConfig;
-            result[obj.name] = obj;
+            result[item.name] = item;
         }
         return result;
     }

packages/foundation/core/test/__mocks__/@objectstack/runtime.ts

@@ -21,13 +21,14 @@ class MockMetadataRegistry {
 
     get<T = any>(type: string, id: string): T | undefined {
         const typeMap = this.store.get(type);
-        return typeMap?.get(id) as T | undefined;
+        const item = typeMap?.get(id);
+        return item?.content as T;
     }
 
     list<T = any>(type: string): T[] {
         const typeMap = this.store.get(type);
         if (!typeMap) return [];
-        return Array.from(typeMap.values()) as T[];
+        return Array.from(typeMap.values()).map(item => item.content as T);
     }
 
     unregister(type: string, id: string): boolean {