docs: 交付文档、维护指引与端到端回归

补齐 README、开发计划、维护交接与 E2E 用例，执行最终验收。

e2e/specs/handover/after-hours.org.spec.ts

@@ -0,0 +1,26 @@
+import { test, expect, channels, chatsWithAgent, setAlwaysClosed, setAlwaysOpen, unique, AI_REPLY } from '@e2e'
+
+// Changes the org's business hours, so it runs in the serial `org` project and
+// reopens the org afterwards (setup leaves it open 24/7).
+
+test.describe('outside business hours', () => {
+  test.use({ agentSettings: { transferToHuman: true } })
+
+  test.afterEach(async ({ adminApi, org }) => { await setAlwaysOpen(adminApi, org.orgId) })
+
+  test('a customer asking for a person is told the team will follow up, and the chat waits in the team\'s queue @handover', async ({ agent, llm, adminApi, request, org, handoverTeam }) => {
+    await setAlwaysClosed(adminApi, org.orgId)
+    await llm.script(agent, (s) => s.otherwise().handOver('We are closed now; the team will get back to you.'))
+
+    const chat = (await channels.WhatsApp({ api: adminApi, request, agentId: agent.id })).chatWith(unique('Nora'))
+    await chat.send('I need to talk to someone')
+    await expect.poll(() => chat.replies(), AI_REPLY).toEqual(['We are closed now; the team will get back to you.'])
+
+    // Queued for the team, unclaimed — whoever opens up next picks it up.
+    const [conversation] = await chatsWithAgent(adminApi, agent.id)
+    expect(conversation).toMatchObject({ status: 'transferred', group_id: (await handoverTeam()).groupId, user_id: null })
+    // The reply was written knowing the team is closed.
+    const prompts = (await llm.requests(agent)).map((r) => r.lastUser).join('\n')
+    expect(prompts).toContain('Currently within business hours: False')
+  })
+})