refactor to adapters

core/identity/application/use-cases/GetUserUseCase.ts

@@ -0,0 +1,14 @@
+import { User } from '../../domain/entities/User';
+import { IUserRepository } from '../../domain/repositories/IUserRepository';
+
+export class GetUserUseCase {
+  constructor(private userRepo: IUserRepository) {}
+
+  async execute(userId: string): Promise<User> {
+    const stored = await this.userRepo.findById(userId);
+    if (!stored) {
+      throw new Error('User not found');
+    }
+    return User.fromStored(stored);
+  }
+}