diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..5f5d809
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,2 @@
+TWITTER_RELAY_BASE_URL=http://127.0.0.1:6900
+BIRD_PROFILE_NAME=
diff --git a/.gitignore b/.gitignore
index a8ccfc4..8a9f57c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,9 @@
 .superpowers/
 .worktrees/
+.env*
+!.env.example
 .output/
+dist/
 node_modules/
+playwright-report/
+test-results/
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..79f537b
--- /dev/null
+++ b/README.md
@@ -0,0 +1,74 @@
+# Twitter Lite
+
+Twitter Lite is an intentional, read-only X reader. It stays empty until you
+enter a user handle, profile URL, or search query.
+
+## Scope
+
+- User timelines and raw X search syntax
+- Popular (`Top`) and chronological (`Latest`) search
+- Optional `filter:follows` search
+- Infinite cursor pagination with explicit retry
+- Read-only cards for text, media, quotes, articles, and quiet engagement counts
+
+It intentionally has no home feed, recommendations, trends, notifications,
+history, account directory, or write actions.
+
+## Requirements and setup
+
+Use Nix, or Node.js `>=22.12.0` with pnpm `11.9.0`. The package link also
+requires a local Bird checkout at `../bird`, exactly at unpublished commit
+`81921226f099e7f7a2107be15fc9783218a6f400`.
+
+A fresh clone of the remote Bird repository alone does **not** contain that
+local Top/Latest commit yet. Obtain the supplied checkout; do not assume the
+commit or a compatible package has been published.
+
+```bash
+cd ../bird
+git rev-parse HEAD
+nix develop -c pnpm install --frozen-lockfile
+nix develop -c pnpm run build:dist
+
+cd ../twitter-lite
+nix develop -c pnpm install --frozen-lockfile
+cp .env.example .env.local
+```
+
+Set `TWITTER_RELAY_BASE_URL` in `.env.local` for Vite development, and set
+`BIRD_PROFILE_NAME` when the relay has multiple profiles. Export the same
+values in the process environment before `start` or `test:live`:
+
+```bash
+export TWITTER_RELAY_BASE_URL=http://127.0.0.1:6900
+export BIRD_PROFILE_NAME=
+```
+
+Both values are read by server-only code at runtime; neither value nor Bird is
+sent to the browser.
+
+## Commands
+
+```bash
+nix develop -c pnpm dev
+nix develop -c pnpm dev:tailscale
+nix develop -c pnpm test
+nix develop -c pnpm test:e2e
+nix develop -c pnpm test:live
+nix develop -c pnpm build
+nix develop -c pnpm start
+```
+
+`test:e2e` is intentionally Nix-only and uses the system Chromium supplied by
+the dev shell. `test:live` is an explicit, opt-in smoke test that performs
+exactly one read-only Top search using the configured relay.
+
+Development binds to `127.0.0.1` by default. `dev:tailscale` binds to
+`0.0.0.0`, so it exposes the app on LAN interfaces as well as Tailscale. Use it
+only on a trusted network and obtain the Tailscale address with
+`tailscale ip -4`.
+
+## Reliability
+
+Bird uses X's internal GraphQL operations through the configured relay. Query
+IDs and response shapes can change without notice.
diff --git a/docs/superpowers/plans/2026-07-13-twitter-lite.md b/docs/superpowers/plans/2026-07-13-twitter-lite.md
index a1bb96a..780abd1 100644
--- a/docs/superpowers/plans/2026-07-13-twitter-lite.md
+++ b/docs/superpowers/plans/2026-07-13-twitter-lite.md
@@ -2861,28 +2861,36 @@ Create `playwright.config.ts`:
 ```ts
 import { defineConfig, devices } from '@playwright/test'
 
+const appPort = 4173
+const relayPort = 6911
+const chromiumExecutable = process.env.PLAYWRIGHT_CHROMIUM_EXECUTABLE
+
+if (!chromiumExecutable) {
+  throw new Error('Run E2E tests through `nix develop` to provide Chromium.')
+}
+
 export default defineConfig({
   testDir: './tests/e2e',
   fullyParallel: false,
+  workers: 1,
   use: {
-    baseURL: 'http://127.0.0.1:3000',
-    launchOptions: {
-      executablePath: process.env.PLAYWRIGHT_CHROMIUM_EXECUTABLE,
-    },
+    baseURL: `http://127.0.0.1:${appPort}`,
+    launchOptions: { executablePath: chromiumExecutable },
     screenshot: 'only-on-failure',
     trace: 'retain-on-failure',
   },
   webServer: [
     {
-      command: 'node tests/e2e/mock-relay.mjs',
-      port: 6901,
+      command: `TWITTER_LITE_MOCK_RELAY_PORT=${relayPort} node tests/e2e/mock-relay.mjs`,
+      port: relayPort,
       reuseExistingServer: false,
+      timeout: 120_000,
     },
     {
-      command:
-        'TWITTER_RELAY_BASE_URL=http://127.0.0.1:6901 BIRD_PROFILE_NAME=e2e pnpm dev',
-      url: 'http://127.0.0.1:3000/user?target=',
+      command: `TWITTER_RELAY_BASE_URL=http://127.0.0.1:${relayPort} BIRD_PROFILE_NAME=e2e pnpm exec vite dev --host 127.0.0.1 --port ${appPort} --strictPort`,
+      url: `http://127.0.0.1:${appPort}`,
       reuseExistingServer: false,
+      timeout: 120_000,
     },
   ],
   projects: [
@@ -2894,11 +2902,11 @@ export default defineConfig({
 
 - [ ] **Step 2: Create a deterministic read-only relay**
 
-Create `tests/e2e/mock-relay.mjs`:
+Create `tests/e2e/mock-relay.mjs`. The response-shape excerpt below is only
+part of the mock: the executable implementation must also enforce the request
+contract listed after it.
 
 ```js
-import { createServer } from 'node:http'
-
 const tweet = (id, text, username = 'yuta') => ({
   entryId: `tweet-${id}`,
   content: {
@@ -2934,89 +2942,22 @@ const cursor = (value) => ({
   entryId: 'cursor-bottom',
   content: { cursorType: 'Bottom', value },
 })
-
-const send = (response, payload, status = 200) => {
-  response.writeHead(status, { 'content-type': 'application/json' })
-  response.end(JSON.stringify(payload))
-}
-
-createServer((request, response) => {
-  if (request.headers['x-profile-name'] !== 'e2e') {
-    send(response, { errors: [{ message: 'missing profile' }] }, 403)
-    return
-  }
-  const url = new URL(request.url ?? '/', 'http://127.0.0.1:6901')
-  const variables = JSON.parse(url.searchParams.get('variables') ?? '{}')
-
-  if (url.pathname.endsWith('/UserByScreenName')) {
-    send(response, {
-      data: {
-        user: {
-          result: {
-            rest_id: '42',
-            legacy: { screen_name: variables.screen_name, name: 'Yuta' },
-          },
-        },
-      },
-    })
-    return
-  }
-
-  if (url.pathname.endsWith('/UserTweets')) {
-    const second = Boolean(variables.cursor)
-    send(response, {
-      data: {
-        user: {
-          result: {
-            timeline: {
-              timeline: {
-                instructions: [
-                  {
-                    entries: second
-                      ? [tweet('u2', 'user page 2')]
-                      : [tweet('u1', 'user page 1'), cursor('user-next')],
-                  },
-                ],
-              },
-            },
-          },
-        },
-      },
-    })
-    return
-  }
-
-  if (url.pathname.endsWith('/SearchTimeline')) {
-    const second = Boolean(variables.cursor)
-    const label = `${variables.product} · ${
-      String(variables.rawQuery).includes('filter:follows')
-        ? 'follows'
-        : 'all'
-    }`
-    send(response, {
-      data: {
-        search_by_raw_query: {
-          search_timeline: {
-            timeline: {
-              instructions: [
-                {
-                  entries: second
-                    ? [tweet('s2', `${label} page 2`)]
-                    : [tweet('s1', `${label} page 1`), cursor('search-next')],
-                },
-              ],
-            },
-          },
-        },
-      },
-    })
-    return
-  }
-
-  send(response, { errors: [{ message: 'unsupported read operation' }] }, 404)
-}).listen(6901, '127.0.0.1')
 ```
 
+Route by the operation-name suffix, never the query ID. Require
+`x-profile-name: e2e`; require GET for `UserByScreenName` and `UserTweets`; and
+require POST plus JSON `{ features, queryId }` for `SearchTimeline`, whose
+`variables` remain in the URL. Validate only the minimal fixture variables,
+not exact query IDs or complete feature bags. Return 405 for a wrong method,
+403 for a wrong profile, 400 for malformed supported input, and 501 for an
+unsupported operation. Never return 404 or make an outbound request.
+
+Key transient state by raw query. The first cursor request for each
+`retry-<project>` query returns 503 once, then succeeds on explicit retry. A
+`slow-<project>` cursor request is delayed long enough to observe the loading
+rail. Every page carrying a cursor also carries a parseable tweet, and page two
+omits the cursor.
+
 - [ ] **Step 3: Write failing end-to-end flows**
 
 Create `tests/e2e/reader.spec.ts`:
@@ -3024,6 +2965,23 @@ Create `tests/e2e/reader.spec.ts`:
 ```ts
 import { expect, test } from '@playwright/test'
 
+let consoleErrors: string[]
+let pageErrors: string[]
+
+test.beforeEach(async ({ page }) => {
+  consoleErrors = []
+  pageErrors = []
+  page.on('console', (message) => {
+    if (message.type() === 'error') consoleErrors.push(message.text())
+  })
+  page.on('pageerror', (error) => pageErrors.push(error.message))
+})
+
+test.afterEach(() => {
+  expect(consoleErrors).toEqual([])
+  expect(pageErrors).toEqual([])
+})
+
 test('requires intent and infinitely loads a user timeline', async ({ page }) => {
   await page.goto('/')
   await expect(page).toHaveURL(/\/user\?target=/)
@@ -3061,6 +3019,14 @@ test('keeps discovery surfaces absent', async ({ page }) => {
 })
 ```
 
+Wait for the cold SSR page to hydrate before manipulating controlled fields.
+In addition to the excerpted happy paths, cover a later-page 503 that retains
+page one and succeeds only after Retry, the exact keyboard Tab order across
+both navigation links and all form controls, absent discovery/mutation links
+and controls, and a `slow-<project>` request under reduced motion whose loading
+rail pseudo-element has `animation-name: none`. Run every flow in both projects
+and let the slow request finish before teardown.
+
 Run:
 
 ```bash
@@ -3085,23 +3051,32 @@ Expected: the first run creates reviewed desktop and mobile `mist-user.png` snap
 Create `tests/live/relay.test.ts`:
 
 ```ts
+// @vitest-environment node
+
 import { TwitterClient } from '@yuta/bird'
 import { describe, expect, it } from 'vitest'
 
 describe.runIf(process.env.TWITTER_LITE_LIVE === '1')(
   'configured relay',
   () => {
-    it('reads one Top search result without a mutation', async () => {
-      const client = new TwitterClient({
-        relayBaseUrl: process.env.TWITTER_RELAY_BASE_URL,
-        profileName: process.env.BIRD_PROFILE_NAME,
-        timeoutMs: 20_000,
-      })
-
-      const result = await client.search('OpenAI', 1, { product: 'Top' })
-      expect(result.success).toBe(true)
-      if (result.success) expect(result.tweets.length).toBeGreaterThan(0)
-    })
+    it(
+      'performs one read-only Top search',
+      async () => {
+        const relayBaseUrl = process.env.TWITTER_RELAY_BASE_URL
+        if (!relayBaseUrl) {
+          throw new Error('TWITTER_RELAY_BASE_URL is required for the live test')
+        }
+        const client = new TwitterClient({
+          relayBaseUrl,
+          profileName: process.env.BIRD_PROFILE_NAME,
+          timeoutMs: 20_000,
+        })
+        const query = process.env.TWITTER_LITE_LIVE_QUERY ?? 'OpenAI'
+        const result = await client.search(query, 1, { product: 'Top' })
+        expect(result.success).toBe(true)
+      },
+      30_000,
+    )
   },
 )
 ```
@@ -3112,7 +3087,9 @@ Run:
 nix develop -c pnpm test:live
 ```
 
-Expected: one read-only Top search test passes using the configured relay.
+Expected: when relay/profile environment configuration is actually available,
+one read-only Top search test passes. Do not run this opt-in command
+unconditionally or log relay configuration, response bodies, or post content.
 
 - [ ] **Step 6: Document setup and intentional omissions**
 
@@ -3127,8 +3104,9 @@ Extend `.gitignore` to exactly:
 
 ```gitignore
 .superpowers/
-.env
-.env.local
+.worktrees/
+.env*
+!.env.example
 .output/
 dist/
 node_modules/
@@ -3141,8 +3119,8 @@ Create `README.md` with these sections and commands:
 ````md
 # Twitter Lite
 
-A localhost-only X reader that shows content only after a deliberate handle,
-profile URL, or search query.
+An intentional, read-only X reader that shows content only after a deliberate
+handle, profile URL, or search query.
 
 ## Features
 
@@ -3155,19 +3133,23 @@ profile URL, or search query.
 
 ## Setup
 
-Clone the modified Bird checkout beside this repository:
+Use Nix, or Node.js `>=22.12.0` with pnpm `11.9.0`. Obtain the supplied local
+Bird checkout beside this repository at unpublished commit
+`81921226f099e7f7a2107be15fc9783218a6f400`. A fresh remote clone alone does
+not contain that Top/Latest commit yet.
 
 ```bash
-git clone https://git.yutakobayashi.com/yuta/bird ../bird
 cd ../bird
+git rev-parse HEAD
 nix develop -c pnpm install --frozen-lockfile
 nix develop -c pnpm run build:dist
 cd ../twitter-lite
 nix develop -c pnpm install --frozen-lockfile
 ```
 
-Set `TWITTER_RELAY_BASE_URL` and, when the relay has multiple profiles,
-`BIRD_PROFILE_NAME`. Bird and both values remain in the server bundle.
+Set `TWITTER_RELAY_BASE_URL` at runtime and, when the relay has multiple
+profiles, `BIRD_PROFILE_NAME`. Bird and both values are read only by
+server-side code and never reach the browser.
 
 ## Commands
 
@@ -3181,8 +3163,11 @@ nix develop -c pnpm build
 nix develop -c pnpm start
 ```
 
-The default bind address is `127.0.0.1`. Use `dev:tailscale` only on a trusted
-tailnet.
+The default bind address is `127.0.0.1`. E2E runs through Nix with the system
+Chromium; the live command performs exactly one explicitly configured read.
+`dev:tailscale` binds `0.0.0.0`, including LAN interfaces as well as Tailscale,
+so use it only on a trusted network. Find the Tailscale address with
+`tailscale ip -4`.
 
 ## Reliability
 
@@ -3198,20 +3183,22 @@ From `../bird`:
 nix develop -c pnpm run build:dist
 nix develop -c pnpm run lint
 nix develop -c pnpm test
-git status --short
+git status --short --branch
+git rev-list --count origin/main..HEAD
+git log --oneline origin/main..HEAD
 ```
 
 From Twitter Lite:
 
 ```bash
 nix develop -c pnpm install --frozen-lockfile
-nix develop -c pnpm generate-routes
+nix develop -c pnpm check:routes
 nix develop -c pnpm lint
 nix develop -c pnpm typecheck
 nix develop -c pnpm test
-nix develop -c pnpm test:e2e
-nix develop -c pnpm test:live
 nix develop -c pnpm build
+nix develop -c pnpm test:e2e
+nix develop -c pnpm test:live # only with configured relay environment
 git diff --check
 ```
 
@@ -3220,7 +3207,9 @@ Expected:
 - Bird build, lint, and all non-live tests pass.
 - Twitter Lite lint, typecheck, unit tests, desktop/mobile browser tests, live read test, and production build pass.
 - Bird has one local feature commit and no remote push.
-- Browser bundles contain no relay environment value and expose no mutation endpoint.
+- Fresh `.output/public` scans contain no Bird/client or relay environment names;
+  source contains only the two intended server functions and no mutation/generic
+  proxy calls.
 - `README.md` and the design docs match the delivered commands and behavior.
 - `AGENTS.md` and `CLAUDE.md` remain absent because no agent-specific instruction changed.
 
@@ -3229,17 +3218,19 @@ Expected:
 ```bash
 git add \
   .env.example .gitignore README.md playwright.config.ts \
-  tests/e2e tests/live docs
+  src/routes/__root.tsx tests/e2e tests/live docs
 git commit -m "test: verify intentional reader flows"
 ```
 
 Run one fresh post-commit audit:
 
 ```bash
-git status --short
+git status --short --branch
 git log --oneline --decorate -8
 nix develop -c pnpm test
+nix develop -c pnpm test:e2e
 nix develop -c pnpm build
+git diff --check
 ```
 
 Expected: clean status, the planned commits are present, all unit tests pass, and the production build exits zero.
diff --git a/playwright.config.ts b/playwright.config.ts
new file mode 100644
index 0000000..a10fdeb
--- /dev/null
+++ b/playwright.config.ts
@@ -0,0 +1,41 @@
+import { defineConfig, devices } from '@playwright/test'
+
+const appPort = 4173
+const relayPort = 6911
+const chromiumExecutable = process.env.PLAYWRIGHT_CHROMIUM_EXECUTABLE
+
+if (!chromiumExecutable) {
+  throw new Error(
+    'PLAYWRIGHT_CHROMIUM_EXECUTABLE is required; run E2E tests with `nix develop -c pnpm test:e2e`.',
+  )
+}
+
+export default defineConfig({
+  testDir: './tests/e2e',
+  fullyParallel: false,
+  workers: 1,
+  use: {
+    baseURL: `http://127.0.0.1:${appPort}`,
+    launchOptions: { executablePath: chromiumExecutable },
+    screenshot: 'only-on-failure',
+    trace: 'retain-on-failure',
+  },
+  webServer: [
+    {
+      command: `TWITTER_LITE_MOCK_RELAY_PORT=${relayPort} node tests/e2e/mock-relay.mjs`,
+      port: relayPort,
+      reuseExistingServer: false,
+      timeout: 120_000,
+    },
+    {
+      command: `TWITTER_RELAY_BASE_URL=http://127.0.0.1:${relayPort} BIRD_PROFILE_NAME=e2e pnpm exec vite dev --host 127.0.0.1 --port ${appPort} --strictPort`,
+      url: `http://127.0.0.1:${appPort}`,
+      reuseExistingServer: false,
+      timeout: 120_000,
+    },
+  ],
+  projects: [
+    { name: 'desktop', use: { ...devices['Desktop Chrome'] } },
+    { name: 'mobile', use: { ...devices['Pixel 7'] } },
+  ],
+})
diff --git a/src/routes/__root.tsx b/src/routes/__root.tsx
index 0983bd3..1593d6b 100644
--- a/src/routes/__root.tsx
+++ b/src/routes/__root.tsx
@@ -18,7 +18,13 @@ export const Route = createRootRouteWithContext<RouterContext>()({
       },
       { title: 'Twitter Lite' },
     ],
-    links: [{ rel: 'stylesheet', href: appCss }],
+    links: [
+      { rel: 'stylesheet', href: appCss },
+      {
+        rel: 'icon',
+        href: "data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Ccircle cx='8' cy='8' r='7' fill='%23255f6e'/%3E%3C/svg%3E",
+      },
+    ],
   }),
   shellComponent: RootDocument,
 })
diff --git a/tests/e2e/mock-relay.mjs b/tests/e2e/mock-relay.mjs
new file mode 100644
index 0000000..416032a
--- /dev/null
+++ b/tests/e2e/mock-relay.mjs
@@ -0,0 +1,220 @@
+import { createServer } from 'node:http'
+
+const portValue = process.env.TWITTER_LITE_MOCK_RELAY_PORT
+const port = Number(portValue)
+
+if (!portValue || !Number.isInteger(port) || port < 1) {
+  throw new Error('TWITTER_LITE_MOCK_RELAY_PORT must be a valid port')
+}
+
+const failedRetryQueries = new Set()
+
+const isRecord = (value) =>
+  value !== null && typeof value === 'object' && !Array.isArray(value)
+
+const tweet = (id, text, username = 'yuta') => ({
+  entryId: `tweet-${id}`,
+  content: {
+    itemContent: {
+      tweet_results: {
+        result: {
+          rest_id: id,
+          legacy: {
+            full_text: text,
+            created_at: 'Mon Jul 13 00:00:00 +0000 2026',
+            reply_count: 1,
+            retweet_count: 2,
+            favorite_count: 3,
+            conversation_id_str: id,
+          },
+          core: {
+            user_results: {
+              result: {
+                rest_id: '42',
+                legacy: { screen_name: username, name: 'Yuta' },
+              },
+            },
+          },
+        },
+      },
+    },
+  },
+})
+
+const cursor = (value) => ({
+  entryId: 'cursor-bottom',
+  content: { cursorType: 'Bottom', value },
+})
+
+const send = (response, payload, status = 200, headers = {}) => {
+  response.writeHead(status, {
+    'content-type': 'application/json; charset=utf-8',
+    ...headers,
+  })
+  response.end(JSON.stringify(payload))
+}
+
+const fail = (response, status, message, headers) =>
+  send(response, { errors: [{ message }] }, status, headers)
+
+const variablesFrom = (url) => {
+  const encoded = url.searchParams.get('variables')
+  if (!encoded) throw new Error('variables are required')
+  const variables = JSON.parse(encoded)
+  if (!isRecord(variables)) throw new Error('variables must be an object')
+  return variables
+}
+
+const jsonBodyFrom = async (request) => {
+  let body = ''
+  for await (const chunk of request) {
+    body += chunk
+    if (body.length > 1_000_000) throw new Error('request body is too large')
+  }
+  const parsed = JSON.parse(body)
+  if (!isRecord(parsed)) throw new Error('JSON body must be an object')
+  return parsed
+}
+
+const timeline = (entries) => ({ instructions: [{ entries }] })
+
+const server = createServer(async (request, response) => {
+  const url = new URL(request.url ?? '/', `http://127.0.0.1:${port}`)
+  const operation = ['UserByScreenName', 'UserTweets', 'SearchTimeline'].find(
+    (name) => url.pathname.endsWith(`/${name}`),
+  )
+
+  if (!operation) {
+    fail(response, 501, 'unsupported read operation')
+    return
+  }
+
+  const expectedMethod = operation === 'SearchTimeline' ? 'POST' : 'GET'
+  if (request.method !== expectedMethod) {
+    fail(response, 405, `expected ${expectedMethod}`, {
+      allow: expectedMethod,
+    })
+    return
+  }
+  if (request.headers['x-profile-name'] !== 'e2e') {
+    fail(response, 403, 'invalid profile')
+    return
+  }
+
+  let variables
+  try {
+    variables = variablesFrom(url)
+  } catch {
+    fail(response, 400, 'malformed variables')
+    return
+  }
+
+  if (operation === 'UserByScreenName') {
+    if (
+      typeof variables.screen_name !== 'string' ||
+      variables.screen_name.length === 0
+    ) {
+      fail(response, 400, 'screen_name is required')
+      return
+    }
+    send(response, {
+      data: {
+        user: {
+          result: {
+            rest_id: '42',
+            legacy: { screen_name: variables.screen_name, name: 'Yuta' },
+          },
+        },
+      },
+    })
+    return
+  }
+
+  if (operation === 'UserTweets') {
+    const expectedCursor =
+      variables.cursor === undefined || variables.cursor === 'user-next'
+    if (
+      variables.userId !== '42' ||
+      variables.count !== 20 ||
+      !expectedCursor
+    ) {
+      fail(response, 400, 'invalid user timeline variables')
+      return
+    }
+    const secondPage = variables.cursor === 'user-next'
+    const entries = secondPage
+      ? [tweet('u2', 'user page 2')]
+      : [tweet('u1', 'user page 1'), cursor('user-next')]
+    send(response, {
+      data: {
+        user: { result: { timeline: { timeline: timeline(entries) } } },
+      },
+    })
+    return
+  }
+
+  const contentType = request.headers['content-type'] ?? ''
+  if (!/^application\/json(?:\s*;|$)/i.test(contentType)) {
+    fail(response, 400, 'SearchTimeline requires JSON')
+    return
+  }
+
+  let body
+  try {
+    body = await jsonBodyFrom(request)
+  } catch {
+    fail(response, 400, 'malformed JSON body')
+    return
+  }
+
+  const rawQuery = variables.rawQuery
+  const expectedCursor =
+    variables.cursor === undefined ||
+    variables.cursor === `search-next:${rawQuery}`
+  if (
+    typeof rawQuery !== 'string' ||
+    rawQuery.length === 0 ||
+    variables.count !== 20 ||
+    variables.querySource !== 'typed_query' ||
+    !['Top', 'Latest'].includes(variables.product) ||
+    !expectedCursor ||
+    !isRecord(body.features) ||
+    typeof body.queryId !== 'string' ||
+    body.queryId.length === 0 ||
+    Object.hasOwn(body, 'variables')
+  ) {
+    fail(response, 400, 'invalid search request')
+    return
+  }
+
+  const secondPage = variables.cursor !== undefined
+  if (
+    secondPage &&
+    rawQuery.startsWith('retry-') &&
+    !failedRetryQueries.has(rawQuery)
+  ) {
+    failedRetryQueries.add(rawQuery)
+    fail(response, 503, 'transient fixture failure')
+    return
+  }
+  if (secondPage && rawQuery.startsWith('slow-')) {
+    await new Promise((resolve) => setTimeout(resolve, 1_200))
+  }
+
+  const follows = rawQuery.includes('filter:follows') ? 'follows' : 'all'
+  const label = `${variables.product} · ${follows}`
+  const id = encodeURIComponent(rawQuery)
+  const entries = secondPage
+    ? [tweet(`s-${id}-2`, `${label} page 2`)]
+    : [tweet(`s-${id}-1`, `${label} page 1`), cursor(`search-next:${rawQuery}`)]
+
+  send(response, {
+    data: {
+      search_by_raw_query: {
+        search_timeline: { timeline: timeline(entries) },
+      },
+    },
+  })
+})
+
+server.listen(port, '127.0.0.1')
diff --git a/tests/e2e/reader.spec.ts b/tests/e2e/reader.spec.ts
new file mode 100644
index 0000000..9ce1f65
--- /dev/null
+++ b/tests/e2e/reader.spec.ts
@@ -0,0 +1,143 @@
+import { expect, type Locator, test } from '@playwright/test'
+
+let consoleErrors: string[]
+let pageErrors: string[]
+
+test.beforeEach(async ({ page }) => {
+  consoleErrors = []
+  pageErrors = []
+  page.on('console', (message) => {
+    if (message.type() === 'error') consoleErrors.push(message.text())
+  })
+  page.on('pageerror', (error) => pageErrors.push(error.message))
+})
+
+test.afterEach(() => {
+  expect(consoleErrors, 'browser console errors').toEqual([])
+  expect(pageErrors, 'uncaught browser errors').toEqual([])
+})
+
+const ambientLinkNames = /ホーム|おすすめ|トレンド|通知|履歴/
+const mutationControlNames = /投稿する|返信|いいね|再投稿|フォロー|ブックマーク/
+
+async function submitSearch(
+  page: import('@playwright/test').Page,
+  query: string,
+) {
+  await openReader(page, '/search?q=&product=Latest&following=false')
+  await expect(page.locator('article')).toHaveCount(0)
+  await page.getByLabel('検索語').fill(query)
+  await page.getByRole('button', { name: '検索' }).click()
+}
+
+async function openReader(page: import('@playwright/test').Page, path: string) {
+  await page.goto(path)
+  await page.waitForLoadState('networkidle')
+}
+
+async function tabTo(page: import('@playwright/test').Page, target: Locator) {
+  await page.keyboard.press('Tab')
+  await expect(target).toBeFocused()
+}
+
+test('requires intent and infinitely loads a user timeline', async ({
+  page,
+}) => {
+  await openReader(page, '/')
+  await expect(page).toHaveURL(/\/user\?target=$/)
+  await expect(page.locator('article')).toHaveCount(0)
+  await expect(page.getByRole('link', { name: ambientLinkNames })).toHaveCount(
+    0,
+  )
+
+  await page.getByLabel('ハンドルまたはプロフィール URL').fill('@yuta')
+  await page.getByRole('button', { name: '表示' }).click()
+
+  await expect(page.getByText('user page 1')).toBeVisible()
+  await expect(page.getByText('user page 2')).toBeVisible()
+  await expect(page.getByText('これ以上の投稿はありません。')).toBeVisible()
+  await expect(page).toHaveScreenshot('mist-user.png', {
+    animations: 'disabled',
+    fullPage: true,
+  })
+})
+
+test('searches Top posts from followed accounts', async ({ page }) => {
+  await openReader(page, '/search?q=&product=Latest&following=false')
+  await expect(page.locator('article')).toHaveCount(0)
+  await page.getByLabel('検索語').fill('AI lang:ja')
+  await page.getByLabel('人気順').check()
+  await page.getByLabel('フォロー中のみ').check()
+  await expect(page.getByLabel('フォロー中のみ')).toBeChecked()
+  await page.getByRole('button', { name: '検索' }).click()
+
+  await expect(page).toHaveURL(/following=true/)
+  await expect(page.getByText('Top · follows page 1')).toBeVisible()
+  await expect(page.getByText('Top · follows page 2')).toBeVisible()
+  await expect(page.getByText('これ以上の投稿はありません。')).toBeVisible()
+})
+
+test('retains the first page through a pagination error and retries explicitly', async ({
+  page,
+}, testInfo) => {
+  await submitSearch(page, `retry-${testInfo.project.name}`)
+
+  await expect(page.getByText('Latest · all page 1')).toBeVisible()
+  const laterPageAlert = page
+    .getByRole('alert')
+    .filter({ hasText: '続きの投稿を取得できませんでした。' })
+  await expect(laterPageAlert).toHaveCount(1)
+  await expect(page.getByText('Latest · all page 1')).toBeVisible()
+  await expect(page.getByText('Latest · all page 2')).toHaveCount(0)
+
+  await laterPageAlert.getByRole('button', { name: '再試行' }).click()
+
+  await expect(page.getByText('Latest · all page 2')).toBeVisible()
+  await expect(laterPageAlert).toHaveCount(0)
+  await expect(page.getByText('これ以上の投稿はありません。')).toBeVisible()
+})
+
+test('keeps keyboard focus intentional and discovery or mutation controls absent', async ({
+  page,
+}) => {
+  await openReader(page, '/search?q=&product=Latest&following=false')
+
+  await tabTo(page, page.getByRole('link', { name: 'ユーザー' }))
+  await tabTo(page, page.getByRole('link', { name: '検索' }))
+  await tabTo(page, page.getByLabel('検索語'))
+  const ranking = page.getByLabel('最新順')
+  await expect(ranking).toBeChecked()
+  await tabTo(page, ranking)
+  await tabTo(page, page.getByLabel('フォロー中のみ'))
+  await tabTo(page, page.getByRole('button', { name: '検索' }))
+
+  await expect(page.getByRole('link', { name: ambientLinkNames })).toHaveCount(
+    0,
+  )
+  await expect(
+    page.getByRole('button', { name: mutationControlNames }),
+  ).toHaveCount(0)
+  await expect(
+    page.getByRole('link', { name: mutationControlNames }),
+  ).toHaveCount(0)
+})
+
+test('removes loading rail animation for reduced motion', async ({
+  page,
+}, testInfo) => {
+  await page.emulateMedia({ reducedMotion: 'reduce' })
+  await submitSearch(page, `slow-${testInfo.project.name}`)
+
+  const rail = page.locator('.loading-rail')
+  await expect(rail).toBeVisible()
+  await expect
+    .poll(() =>
+      rail.evaluate((element) =>
+        getComputedStyle(element, '::after').getPropertyValue('animation-name'),
+      ),
+    )
+    .toBe('none')
+
+  await expect(page.getByText('Latest · all page 2')).toBeVisible()
+  await expect(page.getByText('これ以上の投稿はありません。')).toBeVisible()
+})
diff --git a/tests/e2e/reader.spec.ts-snapshots/mist-user-desktop-linux.png b/tests/e2e/reader.spec.ts-snapshots/mist-user-desktop-linux.png
new file mode 100644
index 0000000..69f7c53
Binary files /dev/null and b/tests/e2e/reader.spec.ts-snapshots/mist-user-desktop-linux.png differ
diff --git a/tests/e2e/reader.spec.ts-snapshots/mist-user-mobile-linux.png b/tests/e2e/reader.spec.ts-snapshots/mist-user-mobile-linux.png
new file mode 100644
index 0000000..2767866
Binary files /dev/null and b/tests/e2e/reader.spec.ts-snapshots/mist-user-mobile-linux.png differ
diff --git a/tests/live/relay.test.ts b/tests/live/relay.test.ts
new file mode 100644
index 0000000..c48d832
--- /dev/null
+++ b/tests/live/relay.test.ts
@@ -0,0 +1,28 @@
+// @vitest-environment node
+
+import { TwitterClient } from '@yuta/bird'
+import { describe, expect, it } from 'vitest'
+
+describe.runIf(process.env.TWITTER_LITE_LIVE === '1')(
+  'configured relay',
+  () => {
+    it('performs one read-only Top search', async () => {
+      const relayBaseUrl = process.env.TWITTER_RELAY_BASE_URL
+      if (!relayBaseUrl) {
+        throw new Error(
+          'TWITTER_RELAY_BASE_URL is required for the opt-in live smoke test',
+        )
+      }
+
+      const client = new TwitterClient({
+        relayBaseUrl,
+        profileName: process.env.BIRD_PROFILE_NAME,
+        timeoutMs: 20_000,
+      })
+      const query = process.env.TWITTER_LITE_LIVE_QUERY ?? 'OpenAI'
+      const result = await client.search(query, 1, { product: 'Top' })
+
+      expect(result.success).toBe(true)
+    }, 30_000)
+  },
+)