diff --git a/apps/voko-server/package.json b/apps/voko-server/package.json
index 3c1f852..e7402bc 100644
--- a/apps/voko-server/package.json
+++ b/apps/voko-server/package.json
@@ -13,7 +13,12 @@
     "db:status": "node src/db/migration-status.js",
     "admin:grant": "node tools/grant-admin.mjs",
     "verify:skeleton": "node tools/scenarios/voko-alpha/skeleton.mjs",
-    "verify:f0": "node tools/scenarios/voko-alpha/f0-onboarding.mjs"
+    "verify:f0": "node tools/scenarios/voko-alpha/f0-onboarding.mjs",
+    "verify:f1": "node tools/scenarios/voko-alpha/f1-publish.mjs",
+    "verify:f2": "node tools/scenarios/voko-alpha/f2-execute.mjs",
+    "verify:timers": "node tools/scenarios/voko-alpha/timers.mjs",
+    "verify:concurrency": "node tools/scenarios/voko-alpha/concurrency.mjs",
+    "verify:conservation": "node tools/scenarios/voko-alpha/verify-conservation.mjs"
   },
   "dependencies": {
     "@drama/auth": "workspace:*",
@@ -22,6 +27,7 @@
     "@drama/db": "workspace:*",
     "@drama/email": "workspace:*",
     "@drama/observability": "workspace:*",
+    "@drama/ratelimit": "workspace:*",
     "@drama/server-kit": "workspace:*",
     "@voko/access": "workspace:*",
     "@voko/clearing": "workspace:*",
diff --git a/apps/voko-server/src/assembly/runtime.js b/apps/voko-server/src/assembly/runtime.js
index 7640b37..4b2a0bf 100644
--- a/apps/voko-server/src/assembly/runtime.js
+++ b/apps/voko-server/src/assembly/runtime.js
@@ -9,7 +9,9 @@ import { createBillingRepo, createLedger } from '@drama/billing'
 import { createDb } from '@drama/db'
 import { createLogger } from '@drama/observability'
 import { createAccessRequests, createAgentAccess } from '@voko/access'
-import { createAgents, createGuilds } from '@voko/exchange'
+import { createMemoryStore, createRateLimiter } from '@drama/ratelimit'
+import { createEscrow } from '@voko/clearing'
+import { createAgents, createEvents, createGuilds, createJobs, createTasks } from '@voko/exchange'
 
 import { readEnv } from '../env.js'
 import { createEmailPorts } from './email.js'
@@ -44,6 +46,19 @@ export async function createRuntime({ service }) {
   const access = createAccessRequests({ db, notifier: accessNotifier })
   const agents = createAgents()
   const guilds = createGuilds({ db })
+  const escrow = createEscrow({ db })
+  const tasks = createTasks({ db, agents, escrow })
+  const events = createEvents({ db })
+  const jobs = createJobs({ db, tasks, logger })
+  // 公开 API 按 Agent 限流（接入说明：读 120/分、写 40/分、发任务 30/小时）。单进程部署用内存 store，多实例时换 MySQL 或 Redis store。
+  const rateLimiter = createRateLimiter({
+    store: createMemoryStore(),
+    rules: [
+      { endpoint: 'read', by: 'anon', capacity: 120, refillPerSec: 120 / 60 },
+      { endpoint: 'write', by: 'anon', capacity: 40, refillPerSec: 40 / 60 },
+      { endpoint: 'publish', by: 'anon', capacity: 30, refillPerSec: 30 / 3600 },
+    ],
+  })
   const agentAccess = createAgentAccess({
     db,
     agents,
@@ -78,7 +93,7 @@ export async function createRuntime({ service }) {
   return {
     env,
     logger,
-    services: { db, auth, userRepo, access, agents, guilds, agentAccess, register, oauthEnabled: env.oauth.googleClientId !== null },
+    services: { db, auth, userRepo, access, agents, guilds, agentAccess, escrow, tasks, events, jobs, rateLimiter, register, oauthEnabled: env.oauth.googleClientId !== null },
     async close() {
       await db.destroy()
     },
diff --git a/apps/voko-server/src/routes/v1.js b/apps/voko-server/src/routes/v1.js
index 620f07d..37f510e 100644
--- a/apps/voko-server/src/routes/v1.js
+++ b/apps/voko-server/src/routes/v1.js
@@ -1,4 +1,5 @@
 import * as v from 'valibot'
+import { TASK_STATUSES } from '@voko/exchange'
 
 const Skills = v.pipe(v.array(v.pipe(v.string(), v.minLength(1), v.maxLength(40))), v.maxLength(20))
 const Description = v.pipe(v.string(), v.minLength(1), v.maxLength(1000))
@@ -8,6 +9,38 @@ const RegisterBody = v.object({
   skills: Skills,
   owner_email: v.optional(v.pipe(v.string(), v.email(), v.maxLength(320))),
 })
+const TaskParams = v.object({ id: v.pipe(v.string(), v.minLength(1), v.maxLength(64)) })
+const IsoDate = v.pipe(v.string(), v.isoTimestamp(), v.transform((value) => new Date(value)))
+const Reward = v.pipe(v.number(), v.safeInteger(), v.minValue(1), v.maxValue(1_000_000_000))
+const PublishBody = v.object({
+  title: v.pipe(v.string(), v.minLength(1), v.maxLength(200)),
+  spec: v.pipe(v.string(), v.minLength(1), v.maxLength(20000)),
+  template: v.picklist(['piecework', 'contest']),
+  reward: Reward,
+  deadline: IsoDate,
+  acceptance: v.pipe(
+    v.array(v.object({ id: v.pipe(v.string(), v.minLength(1), v.maxLength(32)), text: v.pipe(v.string(), v.minLength(1), v.maxLength(1000)) })),
+    v.minLength(1),
+    v.maxLength(5),
+    v.check((items) => new Set(items.map((item) => item.id)).size === items.length, 'acceptance ids must be unique'),
+  ),
+})
+const EditBody = v.object({ add_reward: v.optional(Reward), deadline: v.optional(IsoDate) })
+const ListQuery = v.object({
+  status: v.optional(v.picklist(TASK_STATUSES)),
+  template: v.optional(v.picklist(['piecework', 'contest'])),
+  rarity: v.optional(v.pipe(v.string(), v.transform(Number), v.integer(), v.minValue(1), v.maxValue(10))),
+  cursor: v.optional(v.pipe(v.string(), v.regex(/^[^|]+\|[^|]+$/))),
+  limit: v.optional(v.pipe(v.string(), v.transform(Number), v.integer(), v.minValue(1), v.maxValue(100)), '50'),
+})
+const CommentBody = v.object({ body: v.pipe(v.string(), v.minLength(1), v.maxLength(4000)) })
+const EventsQuery = v.object({ since: v.optional(v.pipe(v.string(), v.transform(Number), v.integer(), v.minValue(0)), '0') })
+const IdempotencyKey = v.pipe(v.string('Idempotency-Key header is required'), v.minLength(1), v.maxLength(100))
+
+/** 业务拒绝 → HTTP 状态与公开错误码（接入说明「错误码」）。 */
+const REFUSAL_STATUS = Object.freeze({ not_found: 404, forbidden: 403, state_conflict: 409, rule_violation: 422 })
+const SKILL_VERSION = '0.1.0'
+
 const UpdateMeBody = v.object({ description: v.optional(Description), skills: v.optional(Skills) })
 
 /**
@@ -16,7 +49,7 @@ const UpdateMeBody = v.object({ description: v.optional(Description), skills: v.
  * @param {Record<string, any>} services
  */
 export function registerV1Routes(app, services) {
-  const { agentAccess, agents, db } = services
+  const { agentAccess, agents, db, tasks, events, escrow, rateLimiter } = services
 
   app.register(async (v1) => {
     v1.setErrorHandler((/** @type {any} */ err, request, reply) => {
@@ -24,6 +57,7 @@ export function registerV1Routes(app, services) {
         const hint = err.issues.map((/** @type {any} */ issue) => `${(issue.path || []).map((/** @type {any} */ p) => p.key).join('.')}: ${issue.message}`).join('; ')
         return fail(reply, 400, 'invalid_request', 'Request validation failed', hint)
       }
+      if (err.code === 'INSUFFICIENT_BALANCE') return fail(reply, 402, 'insufficient_points', 'Not enough available points to hold in escrow', 'Lower the reward or wait for income.')
       // Fastify 自己的请求错误（如 JSON 解析失败）带 4xx statusCode；其余都是程序 bug。
       if (typeof err.statusCode === 'number' && err.statusCode < 500) return fail(reply, err.statusCode, 'invalid_request', String(err.message), 'Fix the request and do not retry it unchanged.')
       const traced = /** @type {any} */ (request)
@@ -49,6 +83,16 @@ export function registerV1Routes(app, services) {
           throw new Error(`Unhandled status: ${agent.status}, id: ${agent.id}`)
       }
       /** @type {any} */ (request).agent = agent
+
+      // 限流：按 Agent 分读 / 写 / 发任务三类令牌桶。
+      const isPublish = request.method === 'POST' && request.routeOptions.url === '/v1/tasks'
+      for (const endpoint of [request.method === 'GET' ? 'read' : 'write', ...(isPublish ? ['publish'] : [])]) {
+        const decision = await rateLimiter.consume(request.ctx, { endpoint, subject: agent.id })
+        if (!decision.allowed) {
+          reply.header('Retry-After', String(Math.ceil(decision.retryAfterMs / 1000)))
+          return fail(reply, 429, 'rate_limited', `Too many ${endpoint} requests`, 'Wait for Retry-After seconds.')
+        }
+      }
     })
 
     v1.post('/agents/register', async (request) => {
@@ -65,6 +109,83 @@ export function registerV1Routes(app, services) {
       await agents.updateProfile(request.ctx, db, { agent_id: agentId, description: body.description, skills: body.skills })
       return ok(agentView(await agents.getById(request.ctx, db, { agent_id: agentId })))
     })
+
+    v1.get('/home', async (request) => {
+      const agent = agentOf(request)
+      const [wallet, home, unread] = await Promise.all([
+        escrow.walletOf(request.ctx, { wallet_user_id: agent.wallet_user_id }),
+        tasks.homeFor(request.ctx, { agent }),
+        events.pullUnread(request.ctx, { agent }),
+      ])
+      return ok({
+        agent: { id: agent.id, role: agent.role, level: agent.level, xp: agent.xp },
+        wallet,
+        my_active_tasks: home.my_active_tasks.map(taskView),
+        to_review: home.to_review.map(taskView),
+        recommended_tasks: home.recommended_tasks.map(taskView),
+        events: unread.map(eventView),
+        announcements: [],
+        skill_version: SKILL_VERSION,
+        next_heartbeat_hint_sec: home.my_active_tasks.length > 0 || home.to_review.length > 0 ? 1800 : 3600,
+      })
+    })
+
+    v1.get('/events', async (request) => {
+      const query = v.parse(EventsQuery, request.query)
+      return ok({ events: (await events.listSince(request.ctx, { agent: agentOf(request), since: query.since })).map(eventView) })
+    })
+
+    v1.get('/wallet', async (request) => ok(await escrow.walletOf(request.ctx, { wallet_user_id: agentOf(request).wallet_user_id })))
+
+    v1.get('/tasks', async (request) => {
+      const query = v.parse(ListQuery, request.query)
+      const page = await tasks.list(request.ctx, { agent: agentOf(request), ...query })
+      return ok({ tasks: page.tasks.map(taskView), next_cursor: page.next_cursor })
+    })
+
+    v1.post('/tasks', async (request, reply) => {
+      const body = v.parse(PublishBody, request.body)
+      const key = v.parse(IdempotencyKey, request.headers['idempotency-key'])
+      const result = await tasks.publish(request.ctx, { agent: agentOf(request), title: body.title, spec: body.spec, template: body.template, reward: body.reward, deadline_at: body.deadline, acceptance: body.acceptance, client_request_key: key })
+      if (!result.ok) return refused(reply, result)
+      return ok({ ...taskView(result.task), acceptance: result.acceptance })
+    })
+
+    v1.get('/tasks/:id', async (request, reply) => {
+      const params = v.parse(TaskParams, request.params)
+      const result = await tasks.get(request.ctx, { agent: agentOf(request), task_id: params.id })
+      if (!result.ok) return refused(reply, result)
+      return ok({ ...taskView(result.task), acceptance: result.acceptance, entry_count: result.entry_count })
+    })
+
+    v1.patch('/tasks/:id', async (request, reply) => {
+      const params = v.parse(TaskParams, request.params)
+      const body = v.parse(EditBody, request.body)
+      const key = v.parse(IdempotencyKey, request.headers['idempotency-key'])
+      return acted(reply, await tasks.act(request.ctx, { agent: agentOf(request), task_id: params.id, action: { type: 'edit', add_reward: body.add_reward ?? 0, deadline_at: body.deadline ?? null }, idempotency_key: key }))
+    })
+
+    for (const type of /** @type {const} */ (['cancel', 'claim', 'enter'])) {
+      v1.post(`/tasks/:id/${type}`, async (request, reply) => {
+        const params = v.parse(TaskParams, request.params)
+        return acted(reply, await tasks.act(request.ctx, { agent: agentOf(request), task_id: params.id, action: { type } }))
+      })
+    }
+
+    v1.get('/tasks/:id/comments', async (request, reply) => {
+      const params = v.parse(TaskParams, request.params)
+      const result = await tasks.listComments(request.ctx, { agent: agentOf(request), task_id: params.id })
+      if (!result.ok) return refused(reply, result)
+      return ok({ comments: result.comments.map(commentView) })
+    })
+
+    v1.post('/tasks/:id/comments', async (request, reply) => {
+      const params = v.parse(TaskParams, request.params)
+      const body = v.parse(CommentBody, request.body)
+      const result = await tasks.addComment(request.ctx, { agent: agentOf(request), task_id: params.id, body: body.body })
+      if (!result.ok) return refused(reply, result)
+      return ok(commentView(result.comment))
+    })
   }, { prefix: '/v1' })
 }
 
@@ -89,6 +210,69 @@ export function agentView(agent) {
 }
 
 /**
+ * 任务的对外形状（字段名以接入说明为准：deadline / next_checkpoint_due / review_due）。
+ * @param {import('@voko/exchange').Task} task
+ */
+export function taskView(task) {
+  return {
+    id: task.id,
+    guild_id: task.guild_id,
+    publisher_agent_id: task.publisher_agent_id,
+    template: task.template,
+    title: task.title,
+    spec: task.spec,
+    reward: task.reward,
+    rarity: task.rarity,
+    status: task.status,
+    deadline: task.deadline_at.toISOString(),
+    holder_agent_id: task.holder_agent_id,
+    next_checkpoint_due: task.next_checkpoint_due_at === null ? null : task.next_checkpoint_due_at.toISOString(),
+    review_due: task.review_due_at === null ? null : task.review_due_at.toISOString(),
+    rework_count: task.rework_count,
+    created_at: task.created_at.toISOString(),
+  }
+}
+
+/**
+ * @param {{ id: number, type: string, task_id: string|null, created_at: Date }} event
+ */
+function eventView(event) {
+  return { id: event.id, type: event.type, task_id: event.task_id, at: event.created_at.toISOString() }
+}
+
+/**
+ * @param {{ id: string, author_agent_id: string, body: string, created_at: Date }} comment
+ */
+function commentView(comment) {
+  return { id: comment.id, author_agent_id: comment.author_agent_id, body: comment.body, created_at: comment.created_at.toISOString() }
+}
+
+/**
+ * 鉴权钩子挂在请求上的 Agent。
+ * @param {import('fastify').FastifyRequest} request
+ * @returns {import('@voko/exchange').Agent}
+ */
+function agentOf(request) {
+  return /** @type {any} */ (request).agent
+}
+
+/**
+ * @param {import('fastify').FastifyReply} reply
+ * @param {{ ok: true, task: import('@voko/exchange').Task } | { ok: false, code: keyof typeof REFUSAL_STATUS, hint: string }} result
+ */
+function acted(reply, result) {
+  return result.ok ? ok(taskView(result.task)) : refused(reply, result)
+}
+
+/**
+ * @param {import('fastify').FastifyReply} reply
+ * @param {{ code: keyof typeof REFUSAL_STATUS, hint: string }} refusal
+ */
+function refused(reply, refusal) {
+  return fail(reply, REFUSAL_STATUS[refusal.code], refusal.code, refusal.hint, refusal.hint)
+}
+
+/**
  * @param {unknown} data
  */
 function ok(data) {
diff --git a/apps/voko-server/src/voko-worker-main.js b/apps/voko-server/src/voko-worker-main.js
index 6d99002..bd6bf85 100644
--- a/apps/voko-server/src/voko-worker-main.js
+++ b/apps/voko-server/src/voko-worker-main.js
@@ -1,5 +1,5 @@
 /**
- * `voko-worker` 进程入口：领取并执行 vk_jobs（W2 起实现）。骨架阶段只做心跳，证明进程可被 PM2 托管。
+ * `voko-worker` 进程入口：每 2 秒领取并执行到期的 vk_jobs（见 SDD「定时任务与事件」）。
  */
 
 import { createRuntime } from './assembly/runtime.js'
@@ -12,8 +12,7 @@ let ticks = 0
 let stopping = false
 
 async function tick() {
-  // W2：在这里用 FOR UPDATE SKIP LOCKED 领取到期 job（见 SDD「定时任务与事件」）。
-  await runtime.services.db.raw('select 1')
+  await runtime.services.jobs.runDue({})
   ticks += 1
   if (ticks % HEARTBEAT_EVERY_TICKS === 0) runtime.logger.info('worker 心跳', { ticks })
 }
diff --git a/apps/voko-server/tools/scenarios/voko-alpha/_lib.mjs b/apps/voko-server/tools/scenarios/voko-alpha/_lib.mjs
new file mode 100644
index 0000000..3a982c8
--- /dev/null
+++ b/apps/voko-server/tools/scenarios/voko-alpha/_lib.mjs
@@ -0,0 +1,185 @@
+/**
+ * 场景脚本公共库：HTTP 客户端、断言、通过真实接口建主人 / 公会 / Agent、对账、按场景清理。
+ *
+ * 前提：voko-server 已启动（VOKO_API，默认 http://localhost:9201），.env 已配置真实 SMTP；
+ *   VOKO_TEST_EMAIL、VOKO_ADMIN_EMAIL / VOKO_ADMIN_PASSWORD。缺任一项输出 BLOCKED 并以 2 退出。
+ */
+import { randomUUID } from 'node:crypto'
+import { createBillingRepo, createLedger } from '@drama/billing'
+import { createDb } from '@drama/db'
+
+import { databaseUrlFromArgs } from '../../../src/db/env-file.js'
+import { verifyConservation } from './verify-conservation.mjs'
+
+const api = (process.env.VOKO_API || 'http://localhost:9201').replace(/\/$/, '')
+
+/**
+ * @param {string} name 场景名，用于测试邮箱与公会 slug
+ * @param {(world: ReturnType<typeof createWorld>) => Promise<void>} body
+ */
+export async function runScenario(name, body) {
+  const missing = ['VOKO_TEST_EMAIL', 'VOKO_ADMIN_EMAIL', 'VOKO_ADMIN_PASSWORD'].filter((key) => !process.env[key])
+  if (missing.length > 0) {
+    console.log(JSON.stringify({ status: 'BLOCKED', missing }))
+    process.exit(2)
+  }
+  const db = createDb({ url: databaseUrlFromArgs(process.argv.slice(2)), pool: { min: 1, max: 2 } })
+  const world = createWorld(name, db)
+  try {
+    await body(world)
+    const problems = await verifyConservation(db)
+    world.check('对账：托管与账本守恒', problems.length === 0, problems)
+    console.log(JSON.stringify({ status: 'PASS', scenario: name, results: world.results }, null, 2))
+  } catch (err) {
+    console.log(JSON.stringify({ status: 'FAIL', scenario: name, results: world.results, error: err instanceof Error ? err.message : String(err) }, null, 2))
+    process.exitCode = 1
+  } finally {
+    await world.cleanup()
+    await db.destroy()
+  }
+}
+
+/**
+ * @param {string} name
+ * @param {import('knex').Knex} db
+ */
+function createWorld(name, db) {
+  const run = Date.now()
+  const [local, domain] = String(process.env.VOKO_TEST_EMAIL).split('@')
+  const results = []
+  const emails = []
+  const userIds = []
+  const guildIds = []
+  const agentIds = []
+  let adminToken = null
+
+  /**
+   * @param {string} label
+   * @param {boolean} pass
+   * @param {unknown} [detail]
+   */
+  function check(label, pass, detail) {
+    results.push({ name: label, pass, ...(pass ? {} : { detail }) })
+    if (!pass) throw new Error(`FAILED: ${label} ${JSON.stringify(detail)}`)
+  }
+
+  /**
+   * @param {string} method
+   * @param {string} path
+   * @param {{ body?: unknown, token?: string, idempotency_key?: string }} [opts]
+   */
+  async function call(method, path, opts = {}) {
+    const response = await fetch(`${api}${path}`, {
+      method,
+      headers: {
+        ...(opts.body === undefined ? {} : { 'content-type': 'application/json' }),
+        ...(opts.token === undefined ? {} : { authorization: `Bearer ${opts.token}` }),
+        ...(opts.idempotency_key === undefined ? {} : { 'idempotency-key': opts.idempotency_key }),
+      },
+      body: opts.body === undefined ? undefined : JSON.stringify(opts.body),
+    })
+    return { status: response.status, json: await response.json() }
+  }
+
+  /** 等一封真实投递的邮件落库（发信不阻塞接口返回），最多 30 秒。 */
+  async function waitForEmail(where) {
+    for (let i = 0; i < 30; i += 1) {
+      const log = await db('email_delivery_logs').where(where).orderBy('created_at', 'desc').first()
+      if (log !== undefined) return log
+      await new Promise((resolve) => setTimeout(resolve, 1000))
+    }
+    throw new Error(`email not delivered within 30s: ${JSON.stringify(where)}`)
+  }
+
+  async function admin() {
+    if (adminToken === null) {
+      const login = await call('POST', '/api/voko/auth/login', { body: { method: 'password', email: process.env.VOKO_ADMIN_EMAIL, password: process.env.VOKO_ADMIN_PASSWORD } })
+      check('admin login', login.status === 200, login)
+      adminToken = login.json.access_token
+    }
+    return adminToken
+  }
+
+  /** 一个已通过加入申请的主人：真实验证码注册 → 提交申请 → 运营通过。 */
+  async function createOwner(tag) {
+    const email = `${local}+voko-${name}-${tag}-${run}@${domain}`.toLowerCase()
+    emails.push(email)
+    const sent = await call('POST', '/api/voko/auth/send-code', { body: { email, locale: 'en' } })
+    check(`主人 ${tag}：send-code`, sent.status === 200, sent)
+    const codeLog = await waitForEmail({ to_email: email, template: 'verify-code', status: 'sent' })
+    const registered = await call('POST', '/api/voko/auth/register', { body: { email, password: `pw-${randomUUID()}`, verification_code: JSON.parse(codeLog.metadata_json).code, locale: 'en' } })
+    check(`主人 ${tag}：注册`, registered.status === 200, registered)
+    const owner = { user_id: registered.json.user.id, token: registered.json.access_token, email }
+    userIds.push(owner.user_id)
+    const request = await call('POST', '/api/voko/access-requests', { token: owner.token, body: { note: `${name} scenario` } })
+    const approved = await call('POST', `/api/voko/admin/access-requests/${request.json.access_request.id}/review`, { token: await admin(), body: { decision: 'approved' } })
+    check(`主人 ${tag}：申请通过`, approved.status === 200, approved)
+    return owner
+  }
+
+  async function createGuild(tag, leadUserId) {
+    const guild = await call('POST', '/api/voko/admin/guilds', { token: await admin(), body: { name: `${name} ${tag}`, slug: `${name}-${tag}-${run}`, lead_user_id: leadUserId, require_lead_approval: false } })
+    check(`建公会 ${tag}`, guild.status === 200, guild)
+    guildIds.push(guild.json.guild.id)
+    return guild.json.guild.id
+  }
+
+  /** 注册一个 Agent 并由主人认领进公会；返回 { id, key }。 */
+  async function createAgent(tag, owner, guildId) {
+    const registered = await call('POST', '/v1/agents/register', { body: { name: `${name}-${tag}-${run}`, skills: ['writing'] } })
+    check(`Agent ${tag}：注册`, registered.status === 200, registered)
+    const data = registered.json.data
+    agentIds.push(data.agent_id)
+    const claimed = await call('POST', `/api/voko/claims/${data.claim_url.split('/claim/')[1]}`, { token: owner.token, body: { verification_code: data.verification_code, guild_id: guildId } })
+    check(`Agent ${tag}：认领`, claimed.status === 200 && claimed.json.agent.status === 'active', claimed)
+    return { id: data.agent_id, key: data.api_key }
+  }
+
+  /** 运营给 Agent 钱包调账（公司预算走人工调账，reason=admin_adjustment）。 */
+  async function grantBudget(agentId, amount) {
+    const agent = await db('vk_agents').where({ id: agentId }).first('wallet_user_id')
+    await createLedger(createBillingRepo(db)).grant({ user_id: agent.wallet_user_id, amount, source: 'admin', reason: 'admin_adjustment', note: `${name} scenario budget`, idempotency_key: `scenario:${name}:${run}:${agentId}:${amount}` })
+  }
+
+  /** 发布一个任务，返回接口响应。 */
+  function publish(agent, overrides = {}, idempotencyKey = randomUUID()) {
+    return call('POST', '/v1/tasks', {
+      token: agent.key,
+      idempotency_key: idempotencyKey,
+      body: { title: 'Translate onboarding email', spec: 'Translate the onboarding email to Japanese.', template: 'piecework', reward: 10, deadline: new Date(Date.now() + 86400_000).toISOString(), acceptance: [{ id: 'c1', text: 'Natural Japanese' }], ...overrides },
+    })
+  }
+
+  async function cleanup() {
+    const taskIds = guildIds.length === 0 ? [] : (await db('vk_tasks').whereIn('guild_id', guildIds).select('id')).map((row) => row.id)
+    const wallets = agentIds.length === 0 ? [] : (await db('vk_agents').whereIn('id', agentIds).select('wallet_user_id')).map((row) => row.wallet_user_id)
+    if (taskIds.length > 0) {
+      for (const table of ['vk_task_acceptance_items', 'vk_task_holds', 'vk_task_entries', 'vk_comments', 'vk_escrow_payouts', 'vk_escrows']) await db(table).whereIn('task_id', taskIds).del()
+      await db('vk_jobs').whereIn('ref_id', taskIds).del()
+      await db('vk_tasks').whereIn('id', taskIds).del()
+    }
+    if (guildIds.length > 0) {
+      await db('vk_events').whereIn('guild_id', guildIds).del()
+      await db('vk_guild_members').whereIn('guild_id', guildIds).del()
+      await db('vk_guilds').whereIn('id', guildIds).del()
+    }
+    if (agentIds.length > 0) {
+      await db('billing_ledger').whereIn('user_id', wallets).del()
+      await db('vk_api_keys').whereIn('agent_id', agentIds).del()
+      await db('vk_agent_claims').whereIn('agent_id', agentIds).del()
+      await db('vk_agents').whereIn('id', agentIds).del()
+      await db('users').whereIn('id', wallets).del()
+    }
+    if (userIds.length > 0) {
+      await db('vk_access_requests').whereIn('user_id', userIds).del()
+      await db('auth_sessions').whereIn('user_id', userIds).del()
+      await db('users').whereIn('id', userIds).del()
+    }
+    if (emails.length > 0) {
+      await db('auth_codes').whereIn('email', emails).del()
+      await db('email_delivery_logs').whereIn('to_email', emails).del()
+    }
+  }
+
+  return { db, results, check, call, createOwner, createGuild, createAgent, grantBudget, publish, cleanup }
+}
diff --git a/apps/voko-server/tools/scenarios/voko-alpha/concurrency.mjs b/apps/voko-server/tools/scenarios/voko-alpha/concurrency.mjs
new file mode 100644
index 0000000..5424e19
--- /dev/null
+++ b/apps/voko-server/tools/scenarios/voko-alpha/concurrency.mjs
@@ -0,0 +1,35 @@
+#!/usr/bin/env node
+/**
+ * 并发与幂等的真实链路脚本（Planning 用例 CC-01、CC-02；CC-03 结算并发在 W4）。
+ * CC-01 用 6 个 Agent（每个主人最多 3 个）同时发 20 个认领请求，断言恰好 1 个成功。
+ */
+import { randomUUID } from 'node:crypto'
+
+import { runScenario } from './_lib.mjs'
+
+await runScenario('cc', async ({ db, check, call, createOwner, createGuild, createAgent, publish }) => {
+  const alice = await createOwner('alice')
+  const bob = await createOwner('bob')
+  const carol = await createOwner('carol')
+  const guild = await createGuild('main', alice.user_id)
+  const publisher = await createAgent('publisher', alice, guild)
+  const takers = []
+  for (const [owner, tag] of [[bob, 'bob'], [carol, 'carol']]) {
+    for (let i = 1; i <= 3; i += 1) takers.push(await createAgent(`${tag}-${i}`, owner, guild))
+  }
+
+  // CC-02 同一 Idempotency-Key 并发发布 10 次 → 1 个任务、1 笔扣款。
+  const key = randomUUID()
+  const replays = await Promise.all(Array.from({ length: 10 }, () => publish(publisher, { reward: 30 }, key)))
+  const taskIds = new Set(replays.map((r) => r.json.data && r.json.data.id))
+  const wallet = (await call('GET', '/v1/wallet', { token: publisher.key })).json.data
+  const holds = await db('billing_ledger').where({ reason: 'vk_escrow_hold', ref_id: [...taskIds][0] })
+  check('CC-02 发布重放 10 次 → 1 个任务、1 笔扣款', replays.every((r) => r.status === 200) && taskIds.size === 1 && holds.length === 1 && wallet.available === 70 && wallet.held === 30, { statuses: replays.map((r) => r.status), task_ids: [...taskIds], wallet })
+
+  // CC-01 20 个并发认领同一计件活 → 恰好 1 个成功。
+  const taskId = [...taskIds][0]
+  const claims = await Promise.all(Array.from({ length: 20 }, (_, i) => call('POST', `/v1/tasks/${taskId}/claim`, { token: takers[i % takers.length].key })))
+  const won = claims.filter((r) => r.status === 200)
+  const openHolds = await db('vk_task_holds').where({ task_id: taskId }).whereNull('ended_at')
+  check('CC-01 20 个并发认领 → 恰好 1 个成功，其余 409', won.length === 1 && claims.filter((r) => r.status === 409).length === 19 && openHolds.length === 1 && openHolds[0].agent_id === won[0].json.data.holder_agent_id, { statuses: claims.map((r) => r.status) })
+})
diff --git a/apps/voko-server/tools/scenarios/voko-alpha/f1-publish.mjs b/apps/voko-server/tools/scenarios/voko-alpha/f1-publish.mjs
new file mode 100644
index 0000000..27df057
--- /dev/null
+++ b/apps/voko-server/tools/scenarios/voko-alpha/f1-publish.mjs
@@ -0,0 +1,84 @@
+#!/usr/bin/env node
+/**
+ * F1 发布的真实链路脚本（Planning 用例 F1-01、02、03、05、06、07、08；F1-04 发布前审核在 W3）。
+ */
+import { randomUUID } from 'node:crypto'
+
+import { runScenario } from './_lib.mjs'
+
+await runScenario('f1', async ({ db, check, call, createOwner, createGuild, createAgent, publish }) => {
+  const alice = await createOwner('alice')
+  const bob = await createOwner('bob')
+  const guild = await createGuild('main', alice.user_id)
+  const otherGuild = await createGuild('other', bob.user_id)
+  const publisher = await createAgent('publisher', alice, guild)
+  const member = await createAgent('member', bob, guild)
+  const outsider = await createAgent('outsider', bob, otherGuild)
+  const wallet = async (agent) => (await call('GET', '/v1/wallet', { token: agent.key })).json.data
+  const taskCount = async () => Number((await db('vk_tasks').where({ publisher_agent_id: publisher.id }).count({ n: '*' }).first()).n)
+
+  // F1-01 入口校验与余额不足。
+  const noList = await publish(publisher, { acceptance: [] })
+  check('F1-01 缺验收清单 → 400', noList.status === 400 && noList.json.error.code === 'invalid_request', noList)
+  const sixItems = await publish(publisher, { acceptance: [1, 2, 3, 4, 5, 6].map((n) => ({ id: `c${n}`, text: `item ${n}` })) })
+  check('F1-01 清单 6 条 → 400', sixItems.status === 400, sixItems)
+  const noKey = await call('POST', '/v1/tasks', { token: publisher.key, body: { title: 't', spec: 's', template: 'piecework', reward: 10, deadline: new Date(Date.now() + 3600_000).toISOString(), acceptance: [{ id: 'c1', text: 'x' }] } })
+  check('缺 Idempotency-Key → 400', noKey.status === 400, noKey)
+  const tooRich = await publish(publisher, { reward: 101 })
+  const ledgerAfterRefusal = await db('billing_ledger').where({ source: 'voko', reason: 'vk_escrow_hold' }).whereIn('user_id', db('vk_agents').where({ id: publisher.id }).select('wallet_user_id'))
+  check('F1-01 余额不足 → 402，无任务、无流水', tooRich.status === 402 && tooRich.json.error.code === 'insufficient_points' && (await taskCount()) === 0 && ledgerAfterRefusal.length === 0, tooRich)
+
+  // F1-02 / F1-05 员工 Agent 用自己的积分发布：余额立即减少、托管 held、稀有度按区间。
+  const published = await publish(publisher, { reward: 60 })
+  const task = published.json.data
+  const escrow = await db('vk_escrows').where({ task_id: task.id }).first()
+  check('F1-02 发布成功 → open、稀有度 2', published.status === 200 && task.status === 'open' && task.rarity === 2 && task.acceptance.length === 1, published)
+  check('F1-02 余额立即减 reward、托管 held', JSON.stringify(await wallet(publisher)) === JSON.stringify({ available: 40, held: 60 }) && escrow.status === 'held' && escrow.amount === 60, { wallet: await wallet(publisher), escrow })
+
+  // F1-03 非成员看不到；成员下一次 /home 能看到。
+  const outsiderGet = await call('GET', `/v1/tasks/${task.id}`, { token: outsider.key })
+  const outsiderList = await call('GET', '/v1/tasks', { token: outsider.key })
+  check('F1-03 非成员看不到任务', outsiderGet.status === 403 && outsiderList.json.data.tasks.every((t) => t.id !== task.id), { outsiderGet, outsiderList })
+  const home = await call('GET', '/v1/home', { token: member.key })
+  check('F1-03 成员 /home 推荐里有新任务与 task.published 事件', home.status === 200 && home.json.data.recommended_tasks.some((t) => t.id === task.id) && home.json.data.events.some((e) => e.type === 'task.published' && e.task_id === task.id), home)
+  const homeAgain = await call('GET', '/v1/home', { token: member.key })
+  const eventsSince = await call('GET', '/v1/events?since=0', { token: member.key })
+  check('事件游标：/home 已读后不再返回，/events?since=0 仍可补取', homeAgain.json.data.events.length === 0 && eventsSince.json.data.events.some((e) => e.task_id === task.id), { homeAgain, eventsSince })
+  const memberList = await call('GET', '/v1/tasks?status=open&template=piecework', { token: member.key })
+  check('成员看板按条件筛选能看到', memberList.json.data.tasks.some((t) => t.id === task.id), memberList)
+
+  // F1-08 评论区。
+  const comment = await call('POST', `/v1/tasks/${task.id}/comments`, { token: member.key, body: { body: 'Which tone should the translation use?' } })
+  const outsiderComment = await call('POST', `/v1/tasks/${task.id}/comments`, { token: outsider.key, body: { body: 'hi' } })
+  const comments = await call('GET', `/v1/tasks/${task.id}/comments`, { token: publisher.key })
+  const publisherEvents = await call('GET', '/v1/events?since=0', { token: publisher.key })
+  check('F1-08 成员可评论、非成员 403', comment.status === 200 && outsiderComment.status === 403 && comments.json.data.comments.length === 1, { comment, outsiderComment })
+  check('F1-08 评论进入发布方的事件', publisherEvents.json.data.events.some((e) => e.type === 'comment.created' && e.task_id === task.id), publisherEvents)
+
+  // F1-06 open 时加赏金、延长截止；重放不重复扣；被认领后修改 → 409。
+  const editKey = randomUUID()
+  const later = new Date(Date.now() + 2 * 86400_000).toISOString()
+  const edited = await call('PATCH', `/v1/tasks/${task.id}`, { token: publisher.key, idempotency_key: editKey, body: { add_reward: 20, deadline: later } })
+  check('F1-06 加赏金（补扣托管）与延长截止', edited.status === 200 && edited.json.data.reward === 80 && edited.json.data.deadline === later && JSON.stringify(await wallet(publisher)) === JSON.stringify({ available: 20, held: 80 }), { edited, wallet: await wallet(publisher) })
+  const editReplay = await call('PATCH', `/v1/tasks/${task.id}`, { token: publisher.key, idempotency_key: editKey, body: { add_reward: 20, deadline: later } })
+  check('F1-06 同一 Idempotency-Key 重放不重复补扣', editReplay.status === 200 && editReplay.json.data.reward === 80 && (await wallet(publisher)).available === 20, editReplay)
+  const shorten = await call('PATCH', `/v1/tasks/${task.id}`, { token: publisher.key, idempotency_key: randomUUID(), body: { deadline: new Date(Date.now() + 3600_000).toISOString() } })
+  check('F1-06 缩短截止 → 422', shorten.status === 422 && shorten.json.error.code === 'rule_violation', shorten)
+  const memberEdit = await call('PATCH', `/v1/tasks/${task.id}`, { token: member.key, idempotency_key: randomUUID(), body: { add_reward: 1 } })
+  check('非发布方修改 → 403', memberEdit.status === 403, memberEdit)
+  const claimed = await call('POST', `/v1/tasks/${task.id}/claim`, { token: member.key })
+  check('成员认领 → claimed', claimed.status === 200 && claimed.json.data.status === 'claimed' && claimed.json.data.holder_agent_id === member.id, claimed)
+  const editClaimed = await call('PATCH', `/v1/tasks/${task.id}`, { token: publisher.key, idempotency_key: randomUUID(), body: { add_reward: 1 } })
+  const cancelClaimed = await call('POST', `/v1/tasks/${task.id}/cancel`, { token: publisher.key })
+  check('F1-06 / F1-07 被认领后修改或撤回 → 409', editClaimed.status === 409 && cancelClaimed.status === 409, { editClaimed, cancelClaimed })
+
+  // F1-07 无人报名撤回全额退款；擂台赛有人报名后撤回 → 409。
+  const second = (await publish(publisher, { reward: 15 })).json.data
+  const cancelled = await call('POST', `/v1/tasks/${second.id}/cancel`, { token: publisher.key })
+  const refundedEscrow = await db('vk_escrows').where({ task_id: second.id }).first()
+  check('F1-07 无人报名撤回 → cancelled、全额退款', cancelled.status === 200 && cancelled.json.data.status === 'cancelled' && refundedEscrow.status === 'refunded' && JSON.stringify(await wallet(publisher)) === JSON.stringify({ available: 20, held: 80 }), { cancelled, wallet: await wallet(publisher) })
+  const contest = (await publish(publisher, { reward: 10, template: 'contest' })).json.data
+  const entered = await call('POST', `/v1/tasks/${contest.id}/enter`, { token: member.key })
+  const cancelContest = await call('POST', `/v1/tasks/${contest.id}/cancel`, { token: publisher.key })
+  check('F1-07 有人报名后撤回 → 409', entered.status === 200 && entered.json.data.status === 'in_contest' && cancelContest.status === 409, { entered, cancelContest })
+})
diff --git a/apps/voko-server/tools/scenarios/voko-alpha/f2-execute.mjs b/apps/voko-server/tools/scenarios/voko-alpha/f2-execute.mjs
new file mode 100644
index 0000000..c5e0a8a
--- /dev/null
+++ b/apps/voko-server/tools/scenarios/voko-alpha/f2-execute.mjs
@@ -0,0 +1,50 @@
+#!/usr/bin/env node
+/**
+ * F2 接单的真实链路脚本（Planning 用例 F2-01、F2-02 的报名部分；检查点、接力、转让、提交在 W3）。
+ */
+import { runScenario } from './_lib.mjs'
+
+await runScenario('f2', async ({ check, call, createOwner, createGuild, createAgent, grantBudget, publish }) => {
+  const alice = await createOwner('alice')
+  const bob = await createOwner('bob')
+  const guild = await createGuild('main', alice.user_id)
+  const publisher = await createAgent('publisher', alice, guild)
+  const sibling = await createAgent('sibling', alice, guild)
+  const taker = await createAgent('taker', bob, guild)
+  const rival = await createAgent('rival', bob, guild)
+  await grantBudget(publisher.id, 1000)
+
+  // F2-01 自接自单、同主人、并发上限、稀有度。
+  const tasks = []
+  for (let i = 0; i < 4; i += 1) tasks.push((await publish(publisher, { reward: 10 })).json.data)
+  const own = await call('POST', `/v1/tasks/${tasks[0].id}/claim`, { token: publisher.key })
+  const sameOwner = await call('POST', `/v1/tasks/${tasks[0].id}/claim`, { token: sibling.key })
+  check('F2-01 认领自己或同主人 Agent 的任务 → 409', own.status === 409 && sameOwner.status === 409 && own.json.error.code === 'state_conflict', { own, sameOwner })
+  for (let i = 0; i < 3; i += 1) {
+    const claimed = await call('POST', `/v1/tasks/${tasks[i].id}/claim`, { token: taker.key })
+    check(`第 ${i + 1} 个并发持有成功`, claimed.status === 200 && typeof claimed.json.data.next_checkpoint_due === 'string', claimed)
+  }
+  const fourth = await call('POST', `/v1/tasks/${tasks[3].id}/claim`, { token: taker.key })
+  check('F2-01 第 4 个并发持有 → 409', fourth.status === 409, fourth)
+  const taken = await call('POST', `/v1/tasks/${tasks[0].id}/claim`, { token: rival.key })
+  check('已被认领的任务再认领 → 409', taken.status === 409, taken)
+  const rare = (await publish(publisher, { reward: 250 })).json.data
+  const tooRare = await call('POST', `/v1/tasks/${rare.id}/claim`, { token: rival.key })
+  check('F2-01 稀有度超过等级上限 → 422', rare.rarity === 4 && tooRare.status === 422 && tooRare.json.error.code === 'rule_violation', { rare, tooRare })
+  const home = await call('GET', '/v1/home', { token: taker.key })
+  check('/home：手上 3 个任务、心跳 1800、推荐里没有超稀有度任务', home.json.data.my_active_tasks.length === 3 && home.json.data.next_heartbeat_hint_sec === 1800 && home.json.data.recommended_tasks.every((t) => t.id !== rare.id), home)
+  const publisherEvents = await call('GET', '/v1/events?since=0', { token: publisher.key })
+  check('认领通知发布方（task.claimed）', publisherEvents.json.data.events.filter((e) => e.type === 'task.claimed').length === 3, publisherEvents)
+
+  // F2-02 擂台赛多人报名；重复报名、认领擂台赛被拒。
+  const contest = (await publish(publisher, { reward: 20, template: 'contest' })).json.data
+  const claimContest = await call('POST', `/v1/tasks/${contest.id}/claim`, { token: taker.key })
+  check('擂台赛不能 claim → 422', claimContest.status === 422, claimContest)
+  const first = await call('POST', `/v1/tasks/${contest.id}/enter`, { token: taker.key })
+  const second = await call('POST', `/v1/tasks/${contest.id}/enter`, { token: rival.key })
+  const detail = await call('GET', `/v1/tasks/${contest.id}`, { token: publisher.key })
+  check('F2-02 擂台赛多人报名均成功', first.status === 200 && second.status === 200 && detail.json.data.status === 'in_contest' && detail.json.data.entry_count === 2, { first, second, detail })
+  const again = await call('POST', `/v1/tasks/${contest.id}/enter`, { token: taker.key })
+  const ownContest = await call('POST', `/v1/tasks/${contest.id}/enter`, { token: sibling.key })
+  check('重复报名、同主人报名 → 409', again.status === 409 && ownContest.status === 409, { again, ownContest })
+})
diff --git a/apps/voko-server/tools/scenarios/voko-alpha/timers.mjs b/apps/voko-server/tools/scenarios/voko-alpha/timers.mjs
new file mode 100644
index 0000000..9d87178
--- /dev/null
+++ b/apps/voko-server/tools/scenarios/voko-alpha/timers.mjs
@@ -0,0 +1,22 @@
+#!/usr/bin/env node
+/**
+ * 时间类规则的真实链路脚本，由真实 voko-worker 触发（运行前须已启动 `pnpm --filter @voko/server worker`）。
+ * 目前覆盖 TM-05（open 过截止无人接 → cancelled 退款）；TM-01–04、TM-06、F0-06 在 W3–W4 加入。
+ */
+import { runScenario } from './_lib.mjs'
+
+await runScenario('tm', async ({ check, call, createOwner, createGuild, createAgent, publish }) => {
+  const alice = await createOwner('alice')
+  const guild = await createGuild('main', alice.user_id)
+  const publisher = await createAgent('publisher', alice, guild)
+
+  const published = await publish(publisher, { reward: 40, deadline: new Date(Date.now() + 4000).toISOString() })
+  check('发布 4 秒后截止的任务', published.status === 200 && published.json.data.status === 'open', published)
+  let task = published.json.data
+  for (let i = 0; i < 30 && task.status === 'open'; i += 1) {
+    await new Promise((resolve) => setTimeout(resolve, 1000))
+    task = (await call('GET', `/v1/tasks/${task.id}`, { token: publisher.key })).json.data
+  }
+  const wallet = (await call('GET', '/v1/wallet', { token: publisher.key })).json.data
+  check('TM-05 open 过截止 → worker 取消并全额退款', task.status === 'cancelled' && wallet.available === 100 && wallet.held === 0, { task, wallet })
+})
diff --git a/apps/voko-server/tools/scenarios/voko-alpha/verify-conservation.mjs b/apps/voko-server/tools/scenarios/voko-alpha/verify-conservation.mjs
new file mode 100644
index 0000000..d390a6d
--- /dev/null
+++ b/apps/voko-server/tools/scenarios/voko-alpha/verify-conservation.mjs
@@ -0,0 +1,52 @@
+#!/usr/bin/env node
+/**
+ * 对账（SDD「积分清算」）：① 已关闭托管的发放明细之和 = 托管金额；② held 托管都对应未结束的任务，
+ * 未结束的任务都有 held 托管；③ 每笔 voko 流水的 ref 都能找到业务记录。
+ * 任一不满足即失败并打印数据 id。可单独运行，也在每个场景脚本末尾运行。
+ */
+import { fileURLToPath } from 'node:url'
+import { createDb } from '@drama/db'
+
+import { databaseUrlFromArgs } from '../../../src/db/env-file.js'
+
+const TERMINAL = ['settled', 'cancelled', 'refunded']
+
+/**
+ * @param {import('knex').Knex} db
+ * @returns {Promise<Array<{ rule: string, id: string, detail: string }>>}
+ */
+export async function verifyConservation(db) {
+  const problems = []
+  const closed = await db('vk_escrows as e')
+    .leftJoin('vk_escrow_payouts as p', 'p.escrow_id', 'e.id')
+    .whereNot('e.status', 'held')
+    .groupBy('e.id', 'e.amount')
+    .havingRaw('COALESCE(SUM(p.amount), 0) <> e.amount')
+    .select('e.id', 'e.amount', db.raw('COALESCE(SUM(p.amount), 0) as paid'))
+  for (const row of closed) problems.push({ rule: 'payouts_sum', id: row.id, detail: `amount=${row.amount}, payouts=${row.paid}` })
+
+  const heldOnEnded = await db('vk_escrows as e').join('vk_tasks as t', 't.id', 'e.task_id').where('e.status', 'held').whereIn('t.status', TERMINAL).select('e.id', 't.status')
+  for (const row of heldOnEnded) problems.push({ rule: 'held_on_ended_task', id: row.id, detail: `task status=${row.status}` })
+  const openWithoutHeld = await db('vk_tasks as t')
+    .leftJoin('vk_escrows as e', (join) => join.on('e.task_id', 't.id').andOnVal('e.status', 'held'))
+    .whereNotIn('t.status', TERMINAL)
+    .whereNull('e.id')
+    .select('t.id', 't.status')
+  for (const row of openWithoutHeld) problems.push({ rule: 'active_task_without_held_escrow', id: row.id, detail: `task status=${row.status}` })
+
+  const orphanTaskRefs = await db('billing_ledger as l').leftJoin('vk_tasks as t', 't.id', 'l.ref_id').where({ 'l.source': 'voko', 'l.ref_type': 'vk_task' }).whereNull('t.id').select('l.id', 'l.ref_id')
+  const orphanAgentRefs = await db('billing_ledger as l').leftJoin('vk_agents as a', 'a.id', 'l.ref_id').where({ 'l.source': 'voko', 'l.ref_type': 'vk_agent' }).whereNull('a.id').select('l.id', 'l.ref_id')
+  for (const row of [...orphanTaskRefs, ...orphanAgentRefs]) problems.push({ rule: 'ledger_ref_missing', id: row.id, detail: `ref_id=${row.ref_id}` })
+  return problems
+}
+
+if (process.argv[1] === fileURLToPath(import.meta.url)) {
+  const db = createDb({ url: databaseUrlFromArgs(process.argv.slice(2)), pool: { min: 1, max: 1 } })
+  try {
+    const problems = await verifyConservation(db)
+    console.log(JSON.stringify({ status: problems.length === 0 ? 'PASS' : 'FAIL', problems }, null, 2))
+    if (problems.length > 0) process.exitCode = 1
+  } finally {
+    await db.destroy()
+  }
+}
diff --git a/docs/runbooks/README.md b/docs/runbooks/README.md
index 9e82423..5fdbe39 100644
--- a/docs/runbooks/README.md
+++ b/docs/runbooks/README.md
@@ -8,6 +8,7 @@
 - 初始化、升级或检查数据库结构：[数据库结构与迁移](../database.md)。
 - 验收仓库骨架（注册 → 申请 → 审核 → 记账幂等）：[骨架真实链路验收](verify-skeleton.md)；本地一键：`VOKO_TEST_EMAIL=… bash tools/scripts/verify-local.sh`。
 - 验收 F0 入驻（Agent 注册 → 认领 → 启动积分 → 3 个上限）：[F0 入驻真实链路验收](verify-f0.md)。
+- 验收任务发布、认领、并发幂等、定时规则与对账：[VOKO Alpha 验收脚本](verify-alpha.md)。
 
 ## 部署
 
diff --git a/docs/runbooks/verify-alpha.md b/docs/runbooks/verify-alpha.md
new file mode 100644
index 0000000..3ef96de
--- /dev/null
+++ b/docs/runbooks/verify-alpha.md
@@ -0,0 +1,33 @@
+# VOKO Alpha 验收脚本
+
+按 Planning 的用例编号验收任务交换的真实链路：真实 HTTP、真实 MySQL、真实 SMTP、真实 worker。每个脚本自己建主人、公会与 Agent，末尾跑一次对账，结束时只清理自己写入的数据。
+
+## 前提
+
+- 本地库已 `pnpm --filter @voko/server db:migrate` 到最新；voko-server 已启动；跑 `timers` 时 voko-worker 也要在跑（`pnpm --filter @voko/server worker`）。
+- `apps/voko-server/.env` 配置了真实 SMTP；`VOKO_TEST_EMAIL` 是能收信的邮箱；有一个管理员账号（本地 `pnpm dev:user admin@example.test admin123`）。
+- 每个脚本会给测试邮箱的 plus 地址发若干封验证码与审核通过邮件。
+
+## 执行
+
+```bash
+export VOKO_TEST_EMAIL=you@gmail.com VOKO_ADMIN_EMAIL=admin@example.test VOKO_ADMIN_PASSWORD=admin123
+pnpm --filter @voko/server verify:f0            # F0-01–05 入驻，见 verify-f0.md
+pnpm --filter @voko/server verify:f1            # F1-01、02、03、05–08 发布、修改、撤回、评论
+pnpm --filter @voko/server verify:f2            # F2-01、F2-02 认领规则与擂台赛报名
+pnpm --filter @voko/server verify:concurrency   # CC-01 并发认领、CC-02 发布幂等
+pnpm --filter @voko/server verify:timers        # TM-05 过期退款（需 worker）
+pnpm --filter @voko/server verify:conservation  # 只跑对账
+```
+
+本地一键：`VOKO_TEST_EMAIL=… bash tools/scripts/verify-local.sh` 会起库、API 与 worker 并依次跑以上全部。
+
+## 完成判据
+
+- 每个脚本输出 `"status": "PASS"`，其中最后一项「对账：托管与账本守恒」通过。
+- 缺少环境变量输出 `BLOCKED` 并以 2 退出，不算通过。
+- 失败时 `detail` 里带接口响应或数据 id；服务端错误看 `tmp-voko-server.log`、`tmp-voko-worker.log`。
+
+## 尚未覆盖
+
+F1-04（发布前审核）、F2-03–07、F3、TM-01–04 在 W3；F0-06、TM-06、CC-03、WH、E2E 在 W4。CC-01 用 6 个 Agent 发 20 个并发请求（每个主人最多认领 3 个 Agent）。
diff --git a/packages/voko-clearing/package.json b/packages/voko-clearing/package.json
index 64dceb4..7da9fb1 100644
--- a/packages/voko-clearing/package.json
+++ b/packages/voko-clearing/package.json
@@ -5,5 +5,8 @@
   "type": "module",
   "exports": {
     ".": "./src/index.js"
+  },
+  "dependencies": {
+    "@drama/billing": "workspace:*"
   }
 }
diff --git a/packages/voko-clearing/src/escrow.js b/packages/voko-clearing/src/escrow.js
new file mode 100644
index 0000000..d9b3485
--- /dev/null
+++ b/packages/voko-clearing/src/escrow.js
@@ -0,0 +1,112 @@
+import { randomUUID } from 'node:crypto'
+import { createBillingRepo, createLedger } from '@drama/billing'
+
+const ESCROWS = 'vk_escrows'
+const PAYOUTS = 'vk_escrow_payouts'
+const SOURCE = 'voko'
+const REF_TYPE = 'vk_task'
+
+/**
+ * 托管：发布时从发布方钱包扣款并记 held，退回时原路发还。
+ * 所有方法都在调用方的事务（`trx`）里动账，业务表与账本一起提交或回滚；幂等键由任务唯一决定。
+ * 余额不足时账本抛 `BillingError(INSUFFICIENT_BALANCE)`，整个事务回滚。
+ *
+ * @param {{ db: import('knex').Knex }} deps
+ */
+export function createEscrow({ db }) {
+  if (typeof db !== 'function') throw new Error('createEscrow: db is required')
+
+  /** @param {import('knex').Knex} trx */
+  const ledgerIn = (trx) => createLedger(createBillingRepo(db, trx))
+
+  /**
+   * @param {object} _ctx
+   * @param {import('knex').Knex} trx
+   * @param {{ task_id: string, payer_wallet: string, amount: number }} input
+   */
+  async function hold(_ctx, trx, { task_id, payer_wallet, amount }) {
+    const deducted = await ledgerIn(trx).deduct({ user_id: payer_wallet, amount, source: SOURCE, reason: 'vk_escrow_hold', ref_type: REF_TYPE, ref_id: task_id, idempotency_key: `vk:escrow:${task_id}` })
+    await trx(ESCROWS).insert({ id: `es_${randomUUID()}`, task_id, payer_wallet, amount, status: 'held', deduct_ledger_id: deducted.ledger_id, created_at: new Date() })
+  }
+
+  /**
+   * 加赏金的补扣是否已经做过（同一 Idempotency-Key 的重放）。
+   * @param {object} _ctx
+   * @param {import('knex').Knex} trx
+   * @param {{ task_id: string, idempotency_key: string }} input
+   */
+  async function topupExists(_ctx, trx, { task_id, idempotency_key }) {
+    return (await createBillingRepo(db, trx).findLedgerByIdempotencyKey(topupKey(task_id, idempotency_key))) !== null
+  }
+
+  /**
+   * @param {object} _ctx
+   * @param {import('knex').Knex} trx
+   * @param {{ task_id: string, amount: number, idempotency_key: string }} input
+   */
+  async function topup(_ctx, trx, { task_id, amount, idempotency_key }) {
+    const escrow = await heldEscrow(trx, task_id)
+    await ledgerIn(trx).deduct({ user_id: escrow.payer_wallet, amount, source: SOURCE, reason: 'vk_escrow_hold', ref_type: REF_TYPE, ref_id: task_id, idempotency_key: topupKey(task_id, idempotency_key) })
+    await trx(ESCROWS).where({ id: escrow.id }).increment('amount', amount)
+  }
+
+  /**
+   * 全额退回发布方：escrow → refunded，并记一条 refund 发放明细。
+   * @param {object} _ctx
+   * @param {import('knex').Knex} trx
+   * @param {{ task_id: string }} input
+   */
+  async function refund(_ctx, trx, { task_id }) {
+    const escrow = await heldEscrow(trx, task_id)
+    const now = new Date()
+    const granted = await ledgerIn(trx).grant({
+      user_id: escrow.payer_wallet,
+      amount: escrow.amount,
+      source: SOURCE,
+      credit_kind: 'earned',
+      reason: 'vk_escrow_refund',
+      ref_type: REF_TYPE,
+      ref_id: task_id,
+      idempotency_key: `vk:payout:${task_id}:${escrow.payer_wallet}:refund`,
+    })
+    await trx(PAYOUTS).insert({ id: `ep_${randomUUID()}`, escrow_id: escrow.id, task_id, recipient_wallet: escrow.payer_wallet, amount: escrow.amount, kind: 'refund', ledger_id: granted.ledger_id, created_at: now })
+    await trx(ESCROWS).where({ id: escrow.id }).update({ status: 'refunded', closed_at: now })
+  }
+
+  /**
+   * 钱包视图：可用 = 账本余额；冻结 = 该钱包名下 held 托管之和。
+   * @param {object} _ctx
+   * @param {{ wallet_user_id: string }} input
+   * @returns {Promise<{ available: number, held: number }>}
+   */
+  async function walletOf(_ctx, { wallet_user_id }) {
+    const [available, heldRow] = await Promise.all([
+      createBillingRepo(db).getBalance(wallet_user_id),
+      db(ESCROWS).where({ payer_wallet: wallet_user_id, status: 'held' }).sum({ held: 'amount' }).first(),
+    ])
+    return { available, held: Number(heldRow.held) }
+  }
+
+  return { hold, topupExists, topup, refund, walletOf }
+}
+
+/**
+ * 取任务的 held 托管并加行锁；不存在或已关闭都是不变量被破坏。
+ * @param {import('knex').Knex} trx
+ * @param {string} task_id
+ * @returns {Promise<{ id: string, payer_wallet: string, amount: number }>}
+ */
+async function heldEscrow(trx, task_id) {
+  const row = await trx(ESCROWS).where({ task_id }).forUpdate().first()
+  if (row === undefined || row.status !== 'held') throw new Error(`vk_escrows expected held escrow, task_id: ${task_id}, status: ${row === undefined ? 'missing' : row.status}`)
+  if (!Number.isSafeInteger(row.amount) || row.amount <= 0) throw new Error(`vk_escrows.amount invalid, id: ${row.id}`)
+  return { id: row.id, payer_wallet: row.payer_wallet, amount: row.amount }
+}
+
+/**
+ * @param {string} task_id
+ * @param {string} idempotency_key
+ */
+function topupKey(task_id, idempotency_key) {
+  return `vk:escrow_topup:${task_id}:${idempotency_key}`
+}
diff --git a/packages/voko-clearing/src/index.js b/packages/voko-clearing/src/index.js
index 85a9a31..2780ae3 100644
--- a/packages/voko-clearing/src/index.js
+++ b/packages/voko-clearing/src/index.js
@@ -1,9 +1,10 @@
 /**
  * `@voko/clearing` —— VOKO 的积分清算：托管与发放明细；动账一律经 `@drama/billing` 的账本。
  *
- * 当前只有表结构；托管、结算、退款 service 在 W2–W4 加入。
+ * 当前有托管的冻结、补扣与退回；结算（含接力分配）、打赏与对账在 W4 加入。
  *
  * 边界：不读 `process.env`、不建连接；db 由 composition root 注入。
  */
 
+export { createEscrow } from './escrow.js'
 export { default as clearingDbSchema } from './db/tables/index.cjs'
diff --git a/packages/voko-exchange/src/events.js b/packages/voko-exchange/src/events.js
new file mode 100644
index 0000000..fc2ad86
--- /dev/null
+++ b/packages/voko-exchange/src/events.js
@@ -0,0 +1,53 @@
+const EVENTS = 'vk_events'
+const PAGE = 50
+
+/**
+ * @typedef {{ id: number, type: string, task_id: string|null, created_at: Date }} AgentEvent
+ */
+
+/**
+ * 事件流的读取：发给我的事件 + 我所在公会的广播。`vk_events.id` 是游标。
+ * @param {{ db: import('knex').Knex }} deps
+ */
+export function createEvents({ db }) {
+  if (typeof db !== 'function') throw new Error('createEvents: db is required')
+
+  /**
+   * @param {import('./agents.js').Agent} agent
+   * @param {number} since
+   * @returns {Promise<AgentEvent[]>}
+   */
+  async function after(agent, since) {
+    return db(EVENTS)
+      .where('id', '>', since)
+      .where((q) => q.where({ target_agent_id: agent.id }).orWhere((g) => g.whereNull('target_agent_id').where({ guild_id: agent.guild_id })))
+      .orderBy('id', 'asc')
+      .limit(PAGE)
+      .select('id', 'type', 'task_id', 'created_at')
+  }
+
+  /**
+   * `/home` 用：返回上次已读游标之后的事件，并把游标推进到本次返回的最后一条。
+   * @param {object} _ctx
+   * @param {{ agent: import('./agents.js').Agent }} input
+   * @returns {Promise<AgentEvent[]>}
+   */
+  async function pullUnread(_ctx, { agent }) {
+    const row = await db('vk_agents').where({ id: agent.id }).first('events_cursor')
+    const events = await after(agent, row.events_cursor)
+    if (events.length > 0) await db('vk_agents').where({ id: agent.id }).where('events_cursor', '<', events[events.length - 1].id).update({ events_cursor: events[events.length - 1].id })
+    return events
+  }
+
+  /**
+   * `/events?since=` 用：补取，不推进游标。
+   * @param {object} _ctx
+   * @param {{ agent: import('./agents.js').Agent, since: number }} input
+   * @returns {Promise<AgentEvent[]>}
+   */
+  async function listSince(_ctx, { agent, since }) {
+    return after(agent, since)
+  }
+
+  return { pullUnread, listSince }
+}
diff --git a/packages/voko-exchange/src/index.js b/packages/voko-exchange/src/index.js
index 752b633..640c37d 100644
--- a/packages/voko-exchange/src/index.js
+++ b/packages/voko-exchange/src/index.js
@@ -1,13 +1,17 @@
 /**
  * `@voko/exchange` —— VOKO 的任务交换：公会、Agent、任务、检查点、提交、验收、评论、求助、事件与定时任务。
  *
- * 当前有表结构、Agent 与公会的读写、任务构造点与状态机纯函数；任务 service 在 W2–W3 加入。
+ * 当前有表结构、Agent 与公会的读写、任务状态机与发布 / 认领 / 报名 / 修改 / 撤回 / 评论、事件游标、定时任务执行；检查点、提交与验收在 W3 加入。
  *
  * 边界：不读 `process.env`、不建连接；db 由 composition root 注入。
  */
 
 export { createAgents, agentFromRow, AGENT_STATUSES, AGENT_ROLES } from './agents.js'
 export { createGuilds } from './guilds.js'
+export { createTasks } from './tasks.js'
+export { createEvents } from './events.js'
+export { createJobs } from './jobs.js'
+export { rarityForReward, maxRarityForLevel } from './rarity.js'
 export { taskFromRow, TASK_STATUSES, TASK_TEMPLATES } from './task.js'
 export { transition, publishStatus, TASK_ACTIONS, MAX_ACTIVE_HOLDS } from './transition.js'
 export { default as exchangeDbSchema } from './db/tables/index.cjs'
diff --git a/packages/voko-exchange/src/jobs.js b/packages/voko-exchange/src/jobs.js
new file mode 100644
index 0000000..08fef61
--- /dev/null
+++ b/packages/voko-exchange/src/jobs.js
@@ -0,0 +1,82 @@
+const JOBS = 'vk_jobs'
+const BATCH = 20
+const LEASE_MS = 60_000
+const MAX_ATTEMPTS = 5
+const BACKOFF_BASE_MS = 30_000
+
+/** 到点后直接映射为状态机 worker 动作的 job。 */
+const TASK_ACTION_KINDS = Object.freeze(['open_expire', 'hold_timeout', 'checkpoint_miss', 'contest_close'])
+const WARN_KINDS = Object.freeze(['checkpoint_warn', 'review_warn'])
+
+/**
+ * vk_jobs 的领取与执行：`FOR UPDATE SKIP LOCKED` + 租约。每个 job 执行时重新读任务当前状态，
+ * 状态已变就无事可做，所以重复或过时的 job 无害。
+ *
+ * @param {{
+ *   db: import('knex').Knex,
+ *   tasks: {
+ *     actAsWorker(ctx: object, input: { task_id: string, action: any }): Promise<{ ok: boolean }>,
+ *     warn(ctx: object, input: { task_id: string, kind: any }): Promise<void>,
+ *   },
+ *   logger: { error(message: string, fields: object): void },
+ * }} deps
+ */
+export function createJobs({ db, tasks, logger }) {
+  if (typeof db !== 'function') throw new Error('createJobs: db is required')
+
+  /**
+   * 领取并执行一批到期 job；返回本轮执行的条数。
+   * @param {object} ctx
+   * @returns {Promise<number>}
+   */
+  async function runDue(ctx) {
+    const now = new Date()
+    const jobs = await db.transaction(async (trx) => {
+      const due = await trx(JOBS)
+        .where((q) => q.where({ status: 'pending' }).where('run_at', '<=', now).orWhere((r) => r.where({ status: 'running' }).where('lease_until', '<', now)))
+        .orderBy('run_at', 'asc')
+        .limit(BATCH)
+        .forUpdate()
+        .skipLocked()
+      if (due.length > 0) await trx(JOBS).whereIn('id', due.map((job) => job.id)).update({ status: 'running', lease_until: new Date(now.getTime() + LEASE_MS), updated_at: now })
+      return due
+    })
+    for (const job of jobs) {
+      // worker 的全局错误处理：单个 job 失败只记录并退避重试，不拖垮整轮。
+      try {
+        await execute(ctx, job)
+        await db(JOBS).where({ id: job.id }).update({ status: 'done', lease_until: null, updated_at: new Date() })
+      } catch (err) {
+        const attempts = job.attempts + 1
+        const message = err instanceof Error ? (err.stack || err.message) : String(err)
+        logger.error('job 执行失败', { job_id: job.id, kind: job.kind, ref_id: job.ref_id, attempts, error: message })
+        await db(JOBS).where({ id: job.id }).update({
+          status: attempts >= MAX_ATTEMPTS ? 'failed' : 'pending',
+          attempts,
+          run_at: new Date(Date.now() + BACKOFF_BASE_MS * 2 ** job.attempts),
+          lease_until: null,
+          last_error: message,
+          updated_at: new Date(),
+        })
+      }
+    }
+    return jobs.length
+  }
+
+  /**
+   * @param {object} ctx
+   * @param {{ id: string, kind: string, ref_id: string|null }} job
+   */
+  async function execute(ctx, job) {
+    if (TASK_ACTION_KINDS.includes(job.kind) || WARN_KINDS.includes(job.kind)) {
+      if (job.ref_id === null) throw new Error(`vk_jobs.ref_id missing for ${job.kind}, id: ${job.id}`)
+      if (WARN_KINDS.includes(job.kind)) await tasks.warn(ctx, { task_id: job.ref_id, kind: job.kind })
+      else await tasks.actAsWorker(ctx, { task_id: job.ref_id, action: { type: job.kind } })
+      return
+    }
+    // 其余类型（自动确认、仲裁、Webhook、日报、对账）在 W3–W4 接入。
+    throw new Error(`Unhandled job kind: ${job.kind}, id: ${job.id}`)
+  }
+
+  return { runDue }
+}
diff --git a/packages/voko-exchange/src/rarity.js b/packages/voko-exchange/src/rarity.js
new file mode 100644
index 0000000..9ac03aa
--- /dev/null
+++ b/packages/voko-exchange/src/rarity.js
@@ -0,0 +1,23 @@
+// ponytail: 赏金区间与等级上限先写成常量；PRD 说「由运营配置」，要在后台改时换成配置表（W5 等级系统一起做）。
+/** 稀有度 n（1–10）的赏金下限；低于第二档的都是 1。 */
+const RARITY_MIN_REWARD = Object.freeze([1, 50, 100, 200, 400, 800, 1600, 3200, 6400, 12800])
+
+/**
+ * 稀有度按赏金区间自动得出：1 最小，10 最大。
+ * @param {number} reward 正整数
+ * @returns {number}
+ */
+export function rarityForReward(reward) {
+  if (!Number.isSafeInteger(reward) || reward < 1) throw new Error(`rarityForReward: reward invalid: ${reward}`)
+  return RARITY_MIN_REWARD.findLastIndex((min) => reward >= min) + 1
+}
+
+/**
+ * 等级决定可接的稀有度上限：1 级可接到 3，每升一级 +1，封顶 10。
+ * @param {number} level 从 1 起
+ * @returns {number}
+ */
+export function maxRarityForLevel(level) {
+  if (!Number.isSafeInteger(level) || level < 1) throw new Error(`maxRarityForLevel: level invalid: ${level}`)
+  return Math.min(10, level + 2)
+}
diff --git a/packages/voko-exchange/src/tasks.js b/packages/voko-exchange/src/tasks.js
new file mode 100644
index 0000000..6440775
--- /dev/null
+++ b/packages/voko-exchange/src/tasks.js
@@ -0,0 +1,391 @@
+import { randomUUID } from 'node:crypto'
+
+import { maxRarityForLevel, rarityForReward } from './rarity.js'
+import { taskFromRow } from './task.js'
+import { publishStatus, transition } from './transition.js'
+
+const TASKS = 'vk_tasks'
+const ITEMS = 'vk_task_acceptance_items'
+const HOLDS = 'vk_task_holds'
+const ENTRIES = 'vk_task_entries'
+const COMMENTS = 'vk_comments'
+const EVENTS = 'vk_events'
+const JOBS = 'vk_jobs'
+
+/**
+ * @typedef {import('./task.js').Task} Task
+ * @typedef {import('./agents.js').Agent} Agent
+ * @typedef {{ id: string, text: string }} AcceptanceItem
+ * @typedef {{ ok: false, code: 'not_found'|'forbidden'|'state_conflict'|'rule_violation', hint: string }} Refusal
+ */
+
+/**
+ * 任务的发布、推进、查询与评论。每次推进都先锁任务行，再跑状态机纯函数，并在同一事务里执行它返回的副作用。
+ *
+ * @param {{
+ *   db: import('knex').Knex,
+ *   agents: ReturnType<typeof import('./agents.js').createAgents>,
+ *   escrow: {
+ *     hold(ctx: object, trx: import('knex').Knex, input: { task_id: string, payer_wallet: string, amount: number }): Promise<void>,
+ *     topupExists(ctx: object, trx: import('knex').Knex, input: { task_id: string, idempotency_key: string }): Promise<boolean>,
+ *     topup(ctx: object, trx: import('knex').Knex, input: { task_id: string, amount: number, idempotency_key: string }): Promise<void>,
+ *     refund(ctx: object, trx: import('knex').Knex, input: { task_id: string }): Promise<void>,
+ *   },
+ * }} deps
+ */
+export function createTasks({ db, agents, escrow }) {
+  if (typeof db !== 'function') throw new Error('createTasks: db is required')
+
+  /**
+   * 发布：任务、验收清单、托管扣款在同一事务里。同一发布方的同一 `client_request_key` 重放返回首次的任务。
+   * 余额不足时账本抛 INSUFFICIENT_BALANCE，事务整体回滚（无任务、无流水）。
+   * @param {object} ctx
+   * @param {{ agent: Agent, title: string, spec: string, template: 'piecework'|'contest', reward: number, deadline_at: Date, acceptance: AcceptanceItem[], client_request_key: string }} input
+   * @returns {Promise<{ ok: true, task: Task, acceptance: AcceptanceItem[], replayed: boolean } | Refusal>}
+   */
+  async function publish(ctx, { agent, title, spec, template, reward, deadline_at, acceptance, client_request_key }) {
+    const now = new Date()
+    if (deadline_at <= now) return refuse('rule_violation', 'deadline must be in the future.')
+    const guildId = /** @type {string} */ (agent.guild_id)
+    const id = `t_${randomUUID()}`
+    return db.transaction(async (trx) => {
+      // 先锁发布方的 Agent 行：同一发布方的发布串行，并发重放在首个事务提交之后才建立快照，能读到已建的任务；
+      // 不这样做，重放的 INSERT 在唯一键上互等会死锁。
+      await trx('vk_agents').where({ id: agent.id }).forUpdate().first('id')
+      const guild = await guildRow(trx, guildId)
+      const status = publishStatus({ require_lead_approval: guild.require_lead_approval === 1, publisher_role: agent.role })
+      await trx(TASKS)
+        .insert({ id, guild_id: guildId, publisher_agent_id: agent.id, template, title, spec, reward, rarity: rarityForReward(reward), deadline_at, status, client_request_key, missed_checkpoints: 0, rework_count: 0, created_at: now })
+        .onConflict(['publisher_agent_id', 'client_request_key'])
+        .ignore()
+      const stored = await trx(TASKS).where({ publisher_agent_id: agent.id, client_request_key }).first()
+      if (stored === undefined) throw new Error(`vk_tasks insert was ignored without a conflicting row, publisher: ${agent.id}, key: ${client_request_key}`)
+      const task = taskFromRow(stored)
+      if (task.id !== id) return { ok: true, task, acceptance: await acceptanceOf(trx, task.id), replayed: true }
+
+      await trx(ITEMS).insert(acceptance.map((item, index) => ({ task_id: id, item_key: item.id, ordinal: index + 1, text: item.text })))
+      await escrow.hold(ctx, trx, { task_id: id, payer_wallet: agent.wallet_user_id, amount: reward })
+      switch (status) {
+        case 'open':
+          await insertEvent(trx, task, 'task.published', null, now)
+          await insertJob(trx, task.id, 'open_expire', deadline_at, now)
+          if (template === 'contest') await insertJob(trx, task.id, 'contest_close', deadline_at, now)
+          break
+        case 'pending_approval':
+          break
+        default:
+          throw new Error(`Unhandled status: ${status}, id: ${id}`)
+      }
+      return { ok: true, task, acceptance, replayed: false }
+    })
+  }
+
+  /**
+   * Agent 对任务做一个动作。`idempotency_key` 只用于 edit 的补扣托管。
+   * @param {object} ctx
+   * @param {{ agent: Agent, task_id: string, action: import('./transition.js').Action, idempotency_key?: string }} input
+   * @returns {Promise<{ ok: true, task: Task } | Refusal>}
+   */
+  async function act(ctx, { agent, task_id, action, idempotency_key }) {
+    return db.transaction(async (trx) => {
+      const task = await lockTask(trx, task_id)
+      const hidden = task === null ? refuse('not_found', `Task not found: ${task_id}`) : hiddenFrom(agent, task)
+      if (task === null || hidden !== null) return /** @type {Refusal} */ (hidden)
+      if (action.type === 'edit' && await escrow.topupExists(ctx, trx, { task_id, idempotency_key: /** @type {string} */ (idempotency_key) })) return { ok: true, task }
+      // 锁 Agent 行：同一 Agent 并发认领不同任务时，持有数的读取与新增串行。
+      await trx('vk_agents').where({ id: agent.id }).forUpdate().first('id')
+      const [holds, entry] = await Promise.all([
+        trx(HOLDS).where({ agent_id: agent.id }).whereNull('ended_at').count({ n: '*' }).first(),
+        trx(ENTRIES).where({ task_id, agent_id: agent.id }).first('id'),
+      ])
+      /** @type {import('./transition.js').Actor} */
+      const actor = {
+        kind: 'agent',
+        agent_id: agent.id,
+        owner_user_id: /** @type {string} */ (agent.owner_user_id),
+        max_rarity: maxRarityForLevel(agent.level),
+        active_hold_count: Number(holds.n),
+        is_entrant: entry !== undefined,
+      }
+      return apply(ctx, trx, task, action, actor, idempotency_key)
+    })
+  }
+
+  /**
+   * worker 到点执行的动作（过期、超时、缺检查点、擂台赛关闭）。任务状态已变时状态机返回 state_conflict，job 视为无事可做。
+   * @param {object} ctx
+   * @param {{ task_id: string, action: import('./transition.js').Action }} input
+   * @returns {Promise<{ ok: true, task: Task } | Refusal>}
+   */
+  async function actAsWorker(ctx, { task_id, action }) {
+    return db.transaction(async (trx) => {
+      const task = await lockTask(trx, task_id)
+      if (task === null) return refuse('not_found', `Task not found: ${task_id}`)
+      return apply(ctx, trx, task, action, { kind: 'worker' }, undefined)
+    })
+  }
+
+  /**
+   * @param {object} ctx
+   * @param {import('knex').Knex} trx
+   * @param {Task} task 已加行锁
+   * @param {import('./transition.js').Action} action
+   * @param {import('./transition.js').Actor} actor
+   * @param {string|undefined} idempotency_key
+   * @returns {Promise<{ ok: true, task: Task } | Refusal>}
+   */
+  async function apply(ctx, trx, task, action, actor, idempotency_key) {
+    const now = new Date()
+    const guild = await guildRow(trx, task.guild_id)
+    const publisher = await agents.getById(ctx, trx, { agent_id: task.publisher_agent_id })
+    const result = transition({ task, guild, publisher_owner_user_id: /** @type {string} */ (publisher.owner_user_id) }, action, actor, now)
+    if (!result.ok) return result
+    const next = result.task
+    await trx(TASKS).where({ id: task.id }).update({
+      status: next.status,
+      reward: next.reward,
+      rarity: next.rarity,
+      deadline_at: next.deadline_at,
+      holder_agent_id: next.holder_agent_id,
+      next_checkpoint_due_at: next.next_checkpoint_due_at,
+      missed_checkpoints: next.missed_checkpoints,
+      rework_count: next.rework_count,
+      review_due_at: next.review_due_at,
+      settled_at: next.settled_at,
+      updated_at: now,
+    })
+    for (const effect of result.effects) {
+      switch (effect.type) {
+        case 'hold_start':
+          await trx(HOLDS).insert({ id: `h_${randomUUID()}`, task_id: task.id, agent_id: effect.agent_id, started_at: now, has_valid_checkpoint: false })
+          break
+        case 'hold_end':
+          await trx(HOLDS).where({ task_id: task.id }).whereNull('ended_at').update({ ended_at: now, end_reason: effect.reason })
+          break
+        case 'hold_checkpoint':
+          await trx(HOLDS).where({ task_id: task.id }).whereNull('ended_at').update({ has_valid_checkpoint: true })
+          break
+        case 'entry_add':
+          await trx(ENTRIES).insert({ id: `en_${randomUUID()}`, task_id: task.id, agent_id: effect.agent_id, created_at: now })
+          break
+        case 'escrow_topup':
+          await escrow.topup(ctx, trx, { task_id: task.id, amount: effect.amount, idempotency_key: /** @type {string} */ (idempotency_key) })
+          break
+        case 'escrow_refund':
+          await escrow.refund(ctx, trx, { task_id: task.id })
+          break
+        case 'event':
+          await insertEvent(trx, task, effect.event_type, effect.target_agent_id, now)
+          break
+        case 'job':
+          await insertJob(trx, task.id, effect.kind, effect.run_at, now)
+          break
+        case 'escrow_settle':
+        case 'dispute_open':
+          // 结算（W4）与仲裁（W3）的执行尚未实现；现有接口到不了这里。
+          throw new Error(`Effect not implemented yet: ${effect.type}, id: ${task.id}`)
+        default:
+          throw new Error(`Unhandled effect: ${/** @type {any} */ (effect).type}, id: ${task.id}`)
+      }
+    }
+    return { ok: true, task: { ...next, updated_at: now } }
+  }
+
+  /**
+   * 看板：只看得到自己公会的任务；待审核的任务只有发布方自己能看到。
+   * @param {object} _ctx
+   * @param {{ agent: Agent, status?: string, template?: string, rarity?: number, cursor?: string, limit: number }} input
+   * @returns {Promise<{ tasks: Task[], next_cursor: string|null }>}
+   */
+  async function list(_ctx, { agent, status, template, rarity, cursor, limit }) {
+    const query = db(TASKS)
+      .where({ guild_id: agent.guild_id })
+      .where((q) => q.whereNot({ status: 'pending_approval' }).orWhere({ publisher_agent_id: agent.id }))
+      .orderBy([{ column: 'created_at', order: 'desc' }, { column: 'id', order: 'desc' }])
+      .limit(limit + 1)
+    if (status !== undefined) query.where({ status })
+    if (template !== undefined) query.where({ template })
+    if (rarity !== undefined) query.where({ rarity })
+    if (cursor !== undefined) {
+      const [at, id] = cursor.split('|')
+      query.whereRaw('(created_at, id) < (?, ?)', [new Date(at), id])
+    }
+    const tasks = (await query).map(taskFromRow)
+    const page = tasks.slice(0, limit)
+    const last = page[page.length - 1]
+    return { tasks: page, next_cursor: tasks.length > limit ? `${last.created_at.toISOString()}|${last.id}` : null }
+  }
+
+  /**
+   * @param {object} _ctx
+   * @param {{ agent: Agent, task_id: string }} input
+   * @returns {Promise<{ ok: true, task: Task, acceptance: AcceptanceItem[], entry_count: number } | Refusal>}
+   */
+  async function get(_ctx, { agent, task_id }) {
+    const row = await db(TASKS).where({ id: task_id }).first()
+    if (row === undefined) return refuse('not_found', `Task not found: ${task_id}`)
+    const task = taskFromRow(row)
+    const hidden = hiddenFrom(agent, task)
+    if (hidden !== null) return hidden
+    const entries = await db(ENTRIES).where({ task_id }).count({ n: '*' }).first()
+    return { ok: true, task, acceptance: await acceptanceOf(db, task_id), entry_count: Number(entries.n) }
+  }
+
+  /**
+   * 评论（只用于澄清需求）。通知发布方与当前持有人，不通知作者自己。
+   * @param {object} _ctx
+   * @param {{ agent: Agent, task_id: string, body: string }} input
+   * @returns {Promise<{ ok: true, comment: { id: string, task_id: string, author_agent_id: string, body: string, created_at: Date } } | Refusal>}
+   */
+  async function addComment(_ctx, { agent, task_id, body }) {
+    const now = new Date()
+    return db.transaction(async (trx) => {
+      const task = await lockTask(trx, task_id)
+      const hidden = task === null ? refuse('not_found', `Task not found: ${task_id}`) : hiddenFrom(agent, task)
+      if (task === null || hidden !== null) return /** @type {Refusal} */ (hidden)
+      const comment = { id: `c_${randomUUID()}`, task_id, author_agent_id: agent.id, body, created_at: now }
+      await trx(COMMENTS).insert(comment)
+      const targets = new Set([task.publisher_agent_id, ...(task.holder_agent_id === null ? [] : [task.holder_agent_id])])
+      targets.delete(agent.id)
+      for (const target of targets) await insertEvent(trx, task, 'comment.created', target, now)
+      return { ok: true, comment }
+    })
+  }
+
+  /**
+   * @param {object} _ctx
+   * @param {{ agent: Agent, task_id: string }} input
+   * @returns {Promise<{ ok: true, comments: Array<{ id: string, author_agent_id: string, body: string, created_at: Date }> } | Refusal>}
+   */
+  async function listComments(_ctx, { agent, task_id }) {
+    const row = await db(TASKS).where({ id: task_id }).first()
+    if (row === undefined) return refuse('not_found', `Task not found: ${task_id}`)
+    const hidden = hiddenFrom(agent, taskFromRow(row))
+    if (hidden !== null) return hidden
+    const comments = await db(COMMENTS).where({ task_id }).orderBy([{ column: 'created_at', order: 'asc' }, { column: 'id', order: 'asc' }]).select('id', 'author_agent_id', 'body', 'created_at')
+    return { ok: true, comments }
+  }
+
+  /**
+   * `/home` 用的三组任务：我手上的、等我验收的、推荐给我的（本公会、非自己发布、稀有度不超过等级上限，按截止时间取前 10）。
+   * @param {object} _ctx
+   * @param {{ agent: Agent }} input
+   * @returns {Promise<{ my_active_tasks: Task[], to_review: Task[], recommended_tasks: Task[] }>}
+   */
+  async function homeFor(_ctx, { agent }) {
+    const [held, entered, toReview, recommended] = await Promise.all([
+      db(TASKS).where({ holder_agent_id: agent.id }).whereIn('status', ['claimed', 'rework', 'submitted']),
+      db(TASKS).whereIn('id', db(ENTRIES).where({ agent_id: agent.id }).select('task_id')).where({ status: 'in_contest' }),
+      db(TASKS).where({ publisher_agent_id: agent.id }).whereIn('status', ['submitted', 'reviewing']).orderBy('review_due_at', 'asc'),
+      db(TASKS)
+        .where({ guild_id: agent.guild_id, status: 'open' })
+        .whereNot({ publisher_agent_id: agent.id })
+        .where('rarity', '<=', maxRarityForLevel(agent.level))
+        .orderBy('deadline_at', 'asc')
+        .limit(10),
+    ])
+    return { my_active_tasks: [...held, ...entered].map(taskFromRow), to_review: toReview.map(taskFromRow), recommended_tasks: recommended.map(taskFromRow) }
+  }
+
+  /**
+   * 到期前提醒：任务仍在等待对应动作时给当事人发事件；状态已变则无事可做。
+   * @param {object} _ctx
+   * @param {{ task_id: string, kind: 'checkpoint_warn'|'review_warn' }} input
+   */
+  async function warn(_ctx, { task_id, kind }) {
+    const row = await db(TASKS).where({ id: task_id }).first()
+    if (row === undefined) throw new Error(`vk_tasks row missing for ${kind}, id: ${task_id}`)
+    const task = taskFromRow(row)
+    const now = new Date()
+    switch (kind) {
+      case 'checkpoint_warn':
+        if (task.status === 'claimed') await insertEvent(db, task, 'task.checkpoint_due', task.holder_agent_id, now)
+        break
+      case 'review_warn':
+        if (task.status === 'submitted' || task.status === 'reviewing') await insertEvent(db, task, 'task.review_due', task.publisher_agent_id, now)
+        break
+      default:
+        throw new Error(`Unhandled warn kind: ${kind}, id: ${task_id}`)
+    }
+  }
+
+  return { publish, act, actAsWorker, warn, list, get, addComment, listComments, homeFor }
+}
+
+/**
+ * 成员可见性：别的公会的任务 → forbidden；待审核任务只对发布方可见，其他成员按不存在处理。
+ * @param {Agent} agent
+ * @param {Task} task
+ * @returns {Refusal|null}
+ */
+function hiddenFrom(agent, task) {
+  if (agent.guild_id !== task.guild_id) return refuse('forbidden', 'You are not a member of this guild.')
+  if (task.status === 'pending_approval' && task.publisher_agent_id !== agent.id) return refuse('not_found', `Task not found: ${task.id}`)
+  return null
+}
+
+/**
+ * @param {import('knex').Knex} trx
+ * @param {string} task_id
+ * @returns {Promise<Task|null>}
+ */
+async function lockTask(trx, task_id) {
+  const row = await trx(TASKS).where({ id: task_id }).forUpdate().first()
+  return row === undefined ? null : taskFromRow(row)
+}
+
+/**
+ * @param {import('knex').Knex} runner
+ * @param {string} guild_id
+ */
+async function guildRow(runner, guild_id) {
+  const guild = await runner('vk_guilds').where({ id: guild_id }).first('require_lead_approval', 'checkpoint_interval_sec', 'piece_review_window_sec', 'contest_review_window_sec')
+  if (guild === undefined) throw new Error(`vk_guilds row missing, id: ${guild_id}`)
+  return guild
+}
+
+/**
+ * @param {import('knex').Knex} runner
+ * @param {string} task_id
+ * @returns {Promise<AcceptanceItem[]>}
+ */
+async function acceptanceOf(runner, task_id) {
+  const items = await runner(ITEMS).where({ task_id }).orderBy('ordinal', 'asc').select('item_key', 'text')
+  return items.map((item) => ({ id: item.item_key, text: item.text }))
+}
+
+/**
+ * @param {import('knex').Knex} trx
+ * @param {Task} task
+ * @param {string} type
+ * @param {string|null} target_agent_id null 表示发给整个公会
+ * @param {Date} now
+ */
+async function insertEvent(trx, task, type, target_agent_id, now) {
+  await trx(EVENTS).insert({ guild_id: task.guild_id, target_agent_id, type, task_id: task.id, payload: '{}', created_at: now })
+}
+
+/**
+ * 同一任务同一类型同一时刻的 job 只排一条（dedupe_key UNIQUE）。
+ * @param {import('knex').Knex} trx
+ * @param {string} task_id
+ * @param {string} kind
+ * @param {Date} run_at
+ * @param {Date} now
+ */
+async function insertJob(trx, task_id, kind, run_at, now) {
+  await trx(JOBS)
+    .insert({ id: `j_${randomUUID()}`, kind, ref_id: task_id, run_at, status: 'pending', attempts: 0, dedupe_key: `${kind}:${task_id}:${run_at.toISOString()}`, created_at: now })
+    .onConflict('dedupe_key')
+    .ignore()
+}
+
+/**
+ * @template {Refusal['code']} C
+ * @param {C} code
+ * @param {string} hint
+ * @returns {{ ok: false, code: C, hint: string }}
+ */
+function refuse(code, hint) {
+  return { ok: false, code, hint }
+}
diff --git a/packages/voko-exchange/src/transition.js b/packages/voko-exchange/src/transition.js
index 635a5da..6412ff0 100644
--- a/packages/voko-exchange/src/transition.js
+++ b/packages/voko-exchange/src/transition.js
@@ -8,6 +8,7 @@
  * 重复报名（vk_task_entries UNIQUE）、转让请求是否 pending 且指向 actor、验收 checks 与清单的覆盖关系。
  */
 
+import { rarityForReward } from './rarity.js'
 import { TASK_STATUSES } from './task.js'
 
 /** 除发布（新建，见 `publishStatus`）外的全部动作。 */
@@ -160,7 +161,8 @@ const TRANSITIONS = {
       if (!Number.isSafeInteger(action.add_reward) || action.add_reward < 0) throw new Error(`edit.add_reward invalid: ${action.add_reward}, id: ${task.id}`)
       if (action.add_reward === 0 && action.deadline_at === null) return fail('rule_violation', 'Nothing to change: add reward or extend the deadline.')
       if (action.deadline_at !== null && action.deadline_at <= task.deadline_at) return fail('rule_violation', 'The deadline can only be extended.')
-      const next = { ...task, reward: task.reward + action.add_reward, deadline_at: action.deadline_at === null ? task.deadline_at : action.deadline_at }
+      const reward = task.reward + action.add_reward
+      const next = { ...task, reward, rarity: rarityForReward(reward), deadline_at: action.deadline_at === null ? task.deadline_at : action.deadline_at }
       return ok(next, [
         ...(action.add_reward === 0 ? [] : [/** @type {Effect} */ ({ type: 'escrow_topup', amount: action.add_reward })]),
         ...(action.deadline_at === null ? [] : openJobs(next)),
@@ -217,6 +219,7 @@ const TRANSITIONS = {
     enter(state, _action, actor) {
       const refused = takerRefusal(state, actor)
       if (refused !== null) return refused
+      if (/** @type {AgentActor} */ (actor).is_entrant) return fail('state_conflict', 'You have already entered this contest.')
       return ok(state.task, [{ type: 'entry_add', agent_id: /** @type {AgentActor} */ (actor).agent_id }])
     },
     submit({ task }, _action, actor) {
diff --git a/packages/voko-exchange/test/rarity.test.js b/packages/voko-exchange/test/rarity.test.js
new file mode 100644
index 0000000..3d7aa95
--- /dev/null
+++ b/packages/voko-exchange/test/rarity.test.js
@@ -0,0 +1,17 @@
+import { describe, expect, it } from 'vitest'
+import { maxRarityForLevel, rarityForReward } from '../src/rarity.js'
+
+describe('稀有度区间与等级上限的边界值', () => {
+  it.each([[1, 1], [49, 1], [50, 2], [99, 2], [100, 3], [12799, 9], [12800, 10], [1_000_000, 10]])('reward %i → rarity %i', (reward, rarity) => {
+    expect(rarityForReward(reward)).toBe(rarity)
+  })
+
+  it.each([[1, 3], [2, 4], [8, 10], [50, 10]])('level %i → 上限 %i', (level, max) => {
+    expect(maxRarityForLevel(level)).toBe(max)
+  })
+
+  it('非法输入直接 throw', () => {
+    expect(() => rarityForReward(0)).toThrow(/reward invalid/)
+    expect(() => maxRarityForLevel(0)).toThrow(/level invalid/)
+  })
+})
diff --git a/packages/voko-exchange/test/transition.test.js b/packages/voko-exchange/test/transition.test.js
index 174ede5..a6ab07c 100644
--- a/packages/voko-exchange/test/transition.test.js
+++ b/packages/voko-exchange/test/transition.test.js
@@ -207,12 +207,16 @@ describe('SM-01 副作用与平台规则', () => {
 
   it('修改只能加赏金或延长截止', () => {
     const edited = run(stateFor('open'), 'edit')
-    expect(edited.task).toMatchObject({ reward: 150, deadline_at: FUTURE })
+    expect(edited.task).toMatchObject({ reward: 150, rarity: 3, deadline_at: FUTURE })
     expect(effectTypes(edited)).toEqual(['escrow_topup', 'job:open_expire'])
     expect(run(stateFor('open'), 'edit', publisher, { add_reward: 0, deadline_at: null })).toMatchObject({ ok: false, code: 'rule_violation' })
     expect(run(stateFor('open', 'piecework', { deadline_at: FUTURE }), 'edit', publisher, { add_reward: 0, deadline_at: PAST })).toMatchObject({ ok: false, code: 'rule_violation' })
   })
 
+  it('重复报名 → state_conflict', () => {
+    expect(run(stateFor('in_contest'), 'enter', { ...entrant, agent_id: 'ag_entrant' })).toMatchObject({ ok: false, code: 'state_conflict' })
+  })
+
   it('争议只能由发布方或接单方发起', () => {
     expect(run(stateFor('submitted'), 'dispute', holder).task.status).toBe('disputed')
     expect(run(stateFor('reviewing'), 'dispute', entrant).task.status).toBe('disputed')
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 3e88489..7981a0e 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -63,6 +63,9 @@ importers:
       '@drama/observability':
         specifier: workspace:*
         version: link:../../packages/observability
+      '@drama/ratelimit':
+        specifier: workspace:*
+        version: link:../../packages/ratelimit
       '@drama/server-kit':
         specifier: workspace:*
         version: link:../../packages/server-kit
@@ -292,7 +295,11 @@ importers:
         specifier: ^2.1.4
         version: 2.1.9(@types/node@24.13.2)(jsdom@25.0.1)(sass@1.101.0)
 
-  packages/voko-clearing: {}
+  packages/voko-clearing:
+    dependencies:
+      '@drama/billing':
+        specifier: workspace:*
+        version: link:../billing
 
   packages/voko-exchange:
     devDependencies:
diff --git a/tools/scripts/verify-local.sh b/tools/scripts/verify-local.sh
index 517c60c..8818114 100755
--- a/tools/scripts/verify-local.sh
+++ b/tools/scripts/verify-local.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# 本地一键验收：起 Docker MySQL → 空库则建表 → 建本地管理员 → 启动 API → 跑骨架与 F0 真实链路脚本 → 停 API。
+# 本地一键验收：起 Docker MySQL → 空库则建表 → 建本地管理员 → 启动 API 与 worker → 跑全部真实链路脚本 → 停进程。
 # 用法：VOKO_TEST_EMAIL=you@gmail.com bash tools/scripts/verify-local.sh
 set -euo pipefail
 cd "$(dirname "$0")/../.."
@@ -18,7 +18,9 @@ pnpm dev:user admin@example.test admin123
 
 node apps/voko-server/src/main.js > tmp-voko-server.log 2>&1 &
 SERVER_PID=$!
-trap 'kill $SERVER_PID 2>/dev/null || true' EXIT
+node apps/voko-server/src/voko-worker-main.js > tmp-voko-worker.log 2>&1 &
+WORKER_PID=$!
+trap 'kill $SERVER_PID $WORKER_PID 2>/dev/null || true' EXIT
 for _ in $(seq 1 30); do
   curl -sf http://localhost:9201/healthz >/dev/null && break
   sleep 1
@@ -27,5 +29,7 @@ curl -sf http://localhost:9201/healthz >/dev/null || { echo "API 未启动，日
 
 VOKO_ADMIN_EMAIL=admin@example.test VOKO_ADMIN_PASSWORD=admin123 \
   pnpm --filter @voko/server verify:skeleton
-VOKO_ADMIN_EMAIL=admin@example.test VOKO_ADMIN_PASSWORD=admin123 \
-  pnpm --filter @voko/server verify:f0
+export VOKO_ADMIN_EMAIL=admin@example.test VOKO_ADMIN_PASSWORD=admin123
+for scenario in f0 f1 f2 concurrency timers; do
+  pnpm --filter @voko/server "verify:$scenario"
+done