refactor racing use cases

core/shared/application/UseCaseOutputPort.ts

@@ -0,0 +1,11 @@
+/**
+ * Output Port interface for use cases.
+ *
+ * Defines how the core communicates outward. A behavioral boundary that allows
+ * the use case to present results without knowing the presentation details.
+ *
+ * @template T - The result type to present
+ */
+export interface UseCaseOutputPort<T> {
+  present(data: T): void;
+}

core/shared/application/index.ts

@@ -1,4 +1,5 @@
 export * from './UseCase';
 export * from './AsyncUseCase';
 export * from './Service';
-export * from './Logger';
+export * from './Logger';
+export * from './UseCaseOutputPort';