feat(coding): add conversation archive and first-message titles

tests/unit/coding-projects-schema-v2.test.ts

@@ -55,6 +55,38 @@ afterEach(async () => {
 });
 
 describe('coding project schema v2', () => {
+  it('assigns the first title once without moving the conversation, and manual names win', async () => {
+    const root = await makeProjectPath();
+    let timestamp = NOW;
+    const store = createCodingConversationStore(root, { now: () => timestamp });
+    const created = await store.create({ agentId: 'builder', title: '新对话', titleMode: 'automatic', model: MODEL, modelResolution: 'resolved' });
+    timestamp = NEXT;
+    await store.setFirstMessageTitle(created.id, '制作登录页面');
+    await store.setFirstMessageTitle(created.id, '第二句话不能覆盖');
+    expect(await store.get(created.id)).toMatchObject({ title: '制作登录页面', updatedAt: NOW, autoTitleSet: true });
+    await store.patchMetadata(created.id, { title: '新对话' });
+    await store.setFirstMessageTitle(created.id, '也不能覆盖手动占位标题');
+    expect(await store.get(created.id)).toMatchObject({ title: '新对话', titleMode: 'manual', updatedAt: NOW });
+    const archived = await store.patchMetadata(created.id, { archivedAt: NEXT });
+    expect(archived).toMatchObject({ archivedAt: NEXT, updatedAt: NEXT });
+    const restored = await store.patchMetadata(created.id, { archivedAt: null });
+    expect(restored.id).toBe(created.id);
+    expect(restored.title).toBe('新对话');
+  });
+
+  it('leaves historical titles alone and never resurrects a deleted conversation', async () => {
+    const root = await makeProjectPath();
+    const store = createCodingConversationStore(root);
+    const created = await store.create({ agentId: 'builder', title: '旧标题', model: MODEL, modelResolution: 'resolved' });
+    const { titleMode: _mode, autoTitleSet: _set, ...legacy } = created;
+    await atomicWriteJson(path.join(root, '.makelore/conversations.json'), { schemaVersion: 2, conversations: [legacy] });
+    expect(await store.setFirstMessageTitle(created.id, '替换标题')).toBeNull();
+    expect(await store.get(created.id)).toMatchObject({ title: '旧标题', titleMode: 'manual', autoTitleSet: true });
+    await store.delete(created.id);
+    expect(await store.setFirstMessageTitle(created.id, '不能复活')).toBeNull();
+    expect((await store.read()).conversations).toEqual([]);
+  });
+
   it('accepts the native max thinking level in a project model reference', () => {
     expect(normalizeProductModelRef({
       accountId: 'account-local',