feat(memory): add operator retrieval plugin (#736)

packages/memory/src/adapters/keyword.test.ts

@@ -274,6 +274,20 @@ describe('KeywordAdapter', () => {
       expect(results).toHaveLength(1);
     });
 
+    it('should return all scoped insights for the explicit wildcard query', async () => {
+      await adapter.storeInsight({
+        userId: 'u1',
+        content: 'A literal * marker is still ordinary content',
+        source: 'chat',
+        category: 'technical',
+        relevanceScore: 0.7,
+      });
+
+      const results = await adapter.searchInsights('u1', '*');
+      expect(results).toHaveLength(4);
+      expect(results.every((result) => result.score === 1)).toBe(true);
+    });
+
     it('should return empty for empty query', async () => {
       const results = await adapter.searchInsights('u1', '   ');
       expect(results).toHaveLength(0);