feat(queue): define QueueAdapter interface types

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/queue/src/index.ts

@@ -6,3 +6,5 @@ export {
   type QueueClient,
   type TaskPayload,
 } from './queue.js';
+
+export { type QueueAdapter, type QueueConfig as QueueAdapterConfig } from './types.js';

packages/queue/src/types.ts

@@ -0,0 +1,18 @@
+export interface TaskPayload {
+  id: string;
+  type: string;
+  data: Record<string, unknown>;
+  createdAt: string;
+}
+
+export interface QueueAdapter {
+  readonly name: string;
+  enqueue(queueName: string, payload: TaskPayload): Promise<void>;
+  dequeue(queueName: string): Promise<TaskPayload | null>;
+  length(queueName: string): Promise<number>;
+  publish(channel: string, message: string): Promise<void>;
+  subscribe(channel: string, handler: (message: string) => void): () => void;
+  close(): Promise<void>;
+}
+
+export type QueueConfig = { type: 'bullmq'; url?: string } | { type: 'local'; dataDir?: string };