feat: add adapter factory + registry pattern for queue, storage, memory

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

packages/memory/src/factory.ts

@@ -0,0 +1,18 @@
+import type { MemoryAdapter, MemoryConfig } from './types.js';
+
+type MemoryType = MemoryConfig['type'];
+
+const registry = new Map<MemoryType, (config: MemoryConfig) => MemoryAdapter>();
+
+export function registerMemoryAdapter(
+  type: MemoryType,
+  factory: (config: MemoryConfig) => MemoryAdapter,
+): void {
+  registry.set(type, factory);
+}
+
+export function createMemoryAdapter(config: MemoryConfig): MemoryAdapter {
+  const factory = registry.get(config.type);
+  if (!factory) throw new Error(`No adapter registered for type: ${config.type}`);
+  return factory(config);
+}