feat: add local SQLite memory store

src/db.test.ts

@@ -30,6 +30,7 @@ import {
   getNewMessagesBySeq,
   getOpenWorkItem,
   getPendingServiceHandoffs,
+  recallMemories,
   getRegisteredAgentTypesForJid,
   getMessagesSince,
   getNewMessages,
@@ -46,6 +47,7 @@ import {
   setSession,
   setRouterStateForService,
   setExplicitRoomMode,
+  rememberMemory,
   storeChatMetadata,
   storeMessage,
   updateRegisteredGroupName,
@@ -1280,6 +1282,68 @@ describe('message seq cursors', () => {
   });
 });
 
+describe('memories', () => {
+  it('recalls scoped memories through FTS and exact keyword matching', () => {
+    rememberMemory({
+      scopeKind: 'room',
+      scopeKey: 'room:test-group',
+      content: '세션 재시작 후에도 방 메모리를 주입한다.',
+      keywords: ['room:test-group', 'session-reset'],
+      sourceKind: 'compact',
+      sourceRef: 'compact:1',
+    });
+    rememberMemory({
+      scopeKind: 'room',
+      scopeKey: 'room:test-group',
+      content: '이 메모리는 다른 검색어다.',
+      keywords: ['room:test-group'],
+      sourceKind: 'compact',
+      sourceRef: 'compact:2',
+    });
+
+    const byText = recallMemories({
+      scopeKind: 'room',
+      scopeKey: 'room:test-group',
+      text: 'session reset',
+      limit: 5,
+    });
+    expect(byText).toHaveLength(1);
+    expect(byText[0].content).toContain('방 메모리를 주입한다');
+
+    const byKeyword = recallMemories({
+      scopeKind: 'room',
+      scopeKey: 'room:test-group',
+      keywords: ['session-reset'],
+      limit: 5,
+    });
+    expect(byKeyword).toHaveLength(1);
+    expect(byKeyword[0].content).toContain('방 메모리를 주입한다');
+  });
+
+  it('archives old memories when a scope exceeds its bounded limit', () => {
+    for (let index = 0; index < 305; index += 1) {
+      rememberMemory({
+        scopeKind: 'room',
+        scopeKey: 'room:bounded',
+        content: `memory-${index}`,
+        keywords: ['room:bounded'],
+        sourceKind: 'compact',
+        sourceRef: `compact:${index}`,
+      });
+    }
+
+    const recalled = recallMemories({
+      scopeKind: 'room',
+      scopeKey: 'room:bounded',
+      limit: 500,
+    });
+
+    expect(recalled).toHaveLength(300);
+    expect(recalled.some((memory) => memory.content === 'memory-0')).toBe(false);
+    expect(recalled.some((memory) => memory.content === 'memory-304')).toBe(true);
+  });
+});
+
 describe('work items', () => {
   it('tracks produced, retry, and delivered states', () => {
     const item = createProducedWorkItem({