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

packages/memory/src/adapters/keyword.ts

@@ -132,19 +132,23 @@ export class KeywordAdapter implements MemoryAdapter {
     opts?: { limit?: number; embedding?: number[] },
   ): Promise<InsightSearchResult[]> {
     const limit = opts?.limit ?? 10;
-    const words = query
-      .toLowerCase()
-      .split(/\s+/)
-      .filter((w) => w.length > 0);
+    const normalizedQuery = query.trim();
+    const matchAll = normalizedQuery === '*';
+    const words = matchAll
+      ? []
+      : normalizedQuery
+          .toLowerCase()
+          .split(/\s+/)
+          .filter((word) => word.length > 0);
 
-    if (words.length === 0) return [];
+    if (words.length === 0 && !matchAll) return [];
 
     const rows = await this.storage.find<InsightRecord>(INSIGHTS, { userId });
 
     const scored: InsightSearchResult[] = [];
     for (const row of rows) {
       const content = row.content.toLowerCase();
-      let score = 0;
+      let score = matchAll ? 1 : 0;
       for (const word of words) {
         if (content.includes(word)) score++;
       }