diff --git a/docs/QINGLONG_3_0_ARCHITECTURE_RFC.md b/docs/QINGLONG_3_0_ARCHITECTURE_RFC.md
index 76a7a980..e272e6c6 100644
--- a/docs/QINGLONG_3_0_ARCHITECTURE_RFC.md
+++ b/docs/QINGLONG_3_0_ARCHITECTURE_RFC.md
@@ -1,5 +1,7 @@
 # QingLong 3.0 Architecture RFC
 
+- D-430/ADR-0532（原生 Console 源码候选）：在原生运行详情中开放日志下一片段、回到开头与当前片段刷新，固定 32 KiB 替换窗口，不累计全文或后台轮询。严格验证响应身份、字节范围与前进 cursor，按不含凭据的选择代次丢弃过期响应，防止切换或断开后覆盖新详情。复用既有 API/Policy/Audit，不新增包、依赖、迁移或后端 authority；默认 headless 与 Cluster 不变。客户端行为测试和真实 Chromium 预览覆盖分页、重复点击、过期响应与字节边界；远端 CI 和 exact 双架构 Console 实物尚待验证。
+
 - D-429/ADR-0531（exact 双架构 Console 阶段实物已交付）：现有面板的 Cron “日志”入口不恢复 2.x `/api/crons/:id/log` 或文件系统日志权威，而是复用规范 v3 Run/Attempt/Artifact 链。`BoundedRunListItem` 仅增加经 128 字节无控制字符验证的可选 `triggerId`；页面按 `triggerId + taskId` 在 Edge 64/Standalone 256 条 Run 总预算中定位最新 Run，再读取 detail 的 latest Attempt 与 16/32 KiB 首个日志片段，明确呈现 pending/retired/truncated。所有请求继续走 Bearer、Project Policy、durable audit、credential reconfirm 与 Artifact retention；不暴露路径、Artifact id、Secret 或其他 Run 私有字段。QL3 Action 列只开放日志，列表关闭旧 10 秒轮询，日志关闭旧 2 秒轮询，仅由初次进入、点击与手动刷新驱动；2.x 行为保持不变。没有新增 package、dependency、migration、schema、listener、连接或后台进程，headless 与 Cluster authority 不变。本地 runtime-core 594/594、Local API 93/93、全包/后端/架构审计、Node 20 production build、240 files / 11,965,017 bytes 闭包审计和真实 Chromium journey 均通过；浏览器稳定 15 秒只有一次 Cron list，日志稳定 5 秒只有 Run list/detail/log 各一次。运行时代码提交 `09ef1745226c05521a9a44accb9d9ef95dd46c85` 的主 CI run `33787481413` 为 42 success / 3 expected skip / 0 fail，Console artifact run `33789576578` 为 43 success / 2 expected skip / 0 fail；amd64/arm64/milestone artifact `9907367021`/`9907250404`/`9907412968` 保留至 2026-10-03，下载后的 `SHA256SUMS` 与 v7 离线 auditor 均返回 `compatible=true`。
 
 - D-428/ADR-0530（exact 双架构阶段实物已交付）：在 D-427 的只读 Cron Adapter 上增加显式 Local 面板能力发现和启动边界，而不是伪造完整 2.x 后端。公开、无敏感数据的 exact `GET /api/health`、`GET /api/system`、`GET /api/v3/capabilities` 只接受无 body 与可选单个数字 `t`；认证后的 `GET /api/user`、`GET /api/system/config` 仍经过 Bearer、`task.read` Policy、durable audit 与 credential reconfirm，并只接受 User principal。capability v1 区分 Edge/Standalone 的 64/256 Cron 行与 16/32 KiB 日志块预算，并明确关闭 legacy login/mutation、Subscription、Script、Env 和 WebSocket。现有面板源码只在严格发现 `qinglong3` capability 后进入 3.0 模式：登录页改收 `ql3c_` API Credential，凭据仅驻留模块内存且刷新即丢失；认证成功只进入 `/crontab`；菜单、请求和 Modal 降级为名称/命令描述符/状态/schedule 的有界只读列表，不请求 View、Subscription、非空搜索/排序，也不建立 WebSocket。2.x 模式保持原行为。该切片不新增 package、production dependency、migration、数据库连接、listener、timer、watcher 或后台进程；默认 headless、Cluster authority 与 Node 24 runtime 均不变，旧 Umi 暂用 Node 20 只作为 legacy migration build toolchain。提交 `fa730da0912d0e3c503697e7816aa0b14fa02165` 的普通主 CI run `33597913690` 为 42 success / 3 expected condition skip / 0 fail，Console artifact run `33597938992` 为 43 success / 2 expected skip / 0 fail；amd64/arm64/milestone artifact `9834695619`/`9834657575`/`9834716653` 保留至 2026-10-02。下载后的 v7 milestone `SHA256SUMS` 与离线 auditor 均返回 `compatible=true`，D-428 因此已经是可直接试运行的阶段页面产物。
diff --git a/docs/adr/ADR-0532-native-console-log-window-navigation.md b/docs/adr/ADR-0532-native-console-log-window-navigation.md
new file mode 100644
index 00000000..f1817de0
--- /dev/null
+++ b/docs/adr/ADR-0532-native-console-log-window-navigation.md
@@ -0,0 +1,27 @@
+# ADR-0532：原生 Console 的日志窗口导航
+
+- 状态：Accepted（D-430 源码候选；远端 CI 与 exact Console 实物待验证）
+- 日期：2026-09-04
+- 关联：QL-RFC-0001 D-430、ADR-0515、ADR-0531
+
+## 问题
+
+原生 3.0 Console 已能创建任务、配置定时与加密凭据，但日志超过首个 32 KiB 后仍要求部署者离开页面自行调用 API。旧面板兼容不是长期产品目标，本切片在原生页面补齐日志观察的用户操作闭环。
+
+## 决策
+
+- 在既有 Attempt log API 上增加“下一片段”“回到开头”“刷新当前片段”。每次用户动作只读取一个 32 KiB 窗口并替换 `<pre>`，不累计历史窗口、不自动翻页、不新增轮询或全文下载。
+- 翻页固定选择时的 Project、Run 与 Attempt；刷新当前片段不会悄然切换到另一个 Attempt。重新选择 Run 才重新读取 latest Attempt、Run/Event/Step 事实。
+- 验证响应 schema、Project/Run/Attempt 身份、字节范围、解码字节数与前进 cursor。异常或停滞 cursor 不生成下一页操作；pending、retired、masked absence 和 unavailable 保持显式状态。
+- 选择请求使用不含凭据的内存代次标记；旧请求在切换 Run、离开运行页、断开连接或同一 Run 重选后不能覆盖当前详情。翻页按钮请求中禁用且合并重复点击，未连接到当前文档的旧节点不能启动新请求。
+- 字节分片仍遵循既有 API，UTF-8 跨片字符可能显示替换符，页面明确说明；不伪造完整行、不保存跨窗口解码缓冲、不修改日志字节偏移。
+
+## 部署边界与验证
+
+不新增 package、dependency、schema、migration、后端 route、数据库连接、listener 或后台任务。默认 headless 与独立 Cluster Console 不变，Local 原生资产仍受单文件 96 KiB / 总计 192 KiB 限制。
+
+客户端行为测试直接执行发布的 `console.js`，覆盖分页替换、范围/身份漂移、连续点击、过期响应、错误状态、空窗口和 UTF-8 字节边界。真实 Chromium 预览已验证首片段 → 下一片段 → 回到开头，DOM 始终只有一个日志窗口，中文与 `<script>` 字面文本安全展示，三个动作只产生三个日志 GET。
+
+本地验证：客户端行为测试 6/6、完整 Local API 99/99、后端 1685 项（1683 pass / 2 环境条件 skip / 0 fail），Local image 与 package boundary audit 均 compatible。原生 JS 为 74,695 bytes，三项资产合计 106,216 bytes，均在既有硬上限内。
+
+源码与本地门通过不等同阶段镜像交付。远端完整 CI、exact Console 双架构构建与离线实物校验仍需闭合；此前 ADR-0531 的 `09ef1745` artifact 不包含本切片。
diff --git a/docs/adr/README.md b/docs/adr/README.md
index 55230eee..defe59cd 100644
--- a/docs/adr/README.md
+++ b/docs/adr/README.md
@@ -535,6 +535,7 @@
 | [ADR-0529](./ADR-0529-bounded-read-only-local-panel-cron-adapter.md)                              | 有界只读 Local 旧面板 Cron Adapter                                                                                                                                                                                                      | Accepted（D-427 双架构阶段实物已交付） |
 | [ADR-0530](./ADR-0530-bounded-local-panel-capability-bootstrap.md)                                | 有界 Local 面板能力发现与启动适配                                                                                                                                                                                                        | Accepted（D-428 exact Console 双架构阶段实物已交付） |
 | [ADR-0531](./ADR-0531-canonical-run-log-bridge-for-legacy-panel.md)                               | 现有面板到规范 Run 日志的有界桥接                                                                                                                                                                                                         | Accepted（D-429 exact Console 双架构阶段实物已交付） |
+| [ADR-0532](./ADR-0532-native-console-log-window-navigation.md) | 原生 Console 日志窗口导航 | Accepted（D-430 源码候选；实物待验证） |
 
 ## 规则
 
diff --git a/packages/ql3-local-api/assets/console/console.js b/packages/ql3-local-api/assets/console/console.js
index e28b04e3..d7cad2ce 100644
--- a/packages/ql3-local-api/assets/console/console.js
+++ b/packages/ql3-local-api/assets/console/console.js
@@ -1527,6 +1527,14 @@
 
   async function selectRun(runId) {
     state.selectedId = runId;
+    const selection = { project: state.project };
+    state.runSelection = selection;
+    const isCurrent = () =>
+      state.runSelection === selection &&
+      state.selectedId === runId &&
+      state.view === 'runs' &&
+      state.project === selection.project &&
+      Boolean(state.token);
     const selected = nodes.ledger.querySelectorAll('.record');
     for (const row of selected) {
       if (row.dataset.identity === runId) {
@@ -1544,24 +1552,44 @@
         api(`/api/v3/projects/${state.project}/runs/${runId}/events?limit=64`),
         api(`/api/v3/projects/${state.project}/runs/${runId}/steps?limit=64`),
       ]);
-      const logView = await readRunLog(runValue.run);
-      renderRunDetail(runValue.run, eventValue, stepValue, logView);
+      if (!isCurrent()) return;
+      if (runValue.run?.id !== runId) throw new Error('Run identity mismatch');
+      const loadPage = (offset) =>
+        readRunLog(runValue.run, offset, selection.project);
+      const logView = await loadPage(0);
+      if (!isCurrent()) return;
+      renderRunDetail(runValue.run, eventValue, stepValue, {
+        ...logView,
+        loadPage,
+        isCurrent,
+      });
     } catch (error) {
-      detailEmpty(describeError(error));
+      if (isCurrent()) detailEmpty(describeError(error));
     }
   }
 
-  async function readRunLog(run) {
+  async function readRunLog(run, offset = 0, project = state.project) {
     const attempt = run?.latestAttempt;
     if (!attempt || typeof attempt.id !== 'string') {
       return Object.freeze({ status: 'not_started' });
     }
+    const context = { attempt, offset };
+    if (!Number.isSafeInteger(offset) || offset < 0) {
+      return Object.freeze({ status: 'unavailable', ...context });
+    }
     try {
       const value = await api(
-        `/api/v3/projects/${state.project}/runs/${run.id}/attempts/${attempt.id}/log?offset=0&length=${LOG_READ_BYTES}`,
+        `/api/v3/projects/${project}/runs/${run.id}/attempts/${attempt.id}/log?offset=${offset}&length=${LOG_READ_BYTES}`,
       );
+      if (
+        value.schema !== 'qinglong/run-attempt-log-read-result@v1' ||
+        value.projectId !== project ||
+        value.runId !== run.id ||
+        value.attemptId !== attempt.id
+      )
+        return Object.freeze({ status: 'unavailable', ...context });
       if (value.status === 'pending') {
-        return Object.freeze({ status: 'pending', attempt });
+        return Object.freeze({ status: 'pending', ...context });
       }
       const content =
         value.status === 'available' && value.encoding === 'base64'
@@ -1572,25 +1600,36 @@
         !value.range ||
         !Number.isSafeInteger(value.range.start) ||
         !Number.isSafeInteger(value.range.endExclusive) ||
-        !Number.isSafeInteger(value.range.totalBytes)
+        !Number.isSafeInteger(value.range.totalBytes) ||
+        value.range.totalBytes < 0 ||
+        value.range.start !== Math.min(offset, value.range.totalBytes) ||
+        value.range.endExclusive < value.range.start ||
+        value.range.endExclusive > value.range.totalBytes ||
+        value.range.endExclusive - value.range.start > LOG_READ_BYTES ||
+        window.atob(value.content).length !==
+          value.range.endExclusive - value.range.start ||
+        (value.range.endExclusive < value.range.totalBytes
+          ? value.range.nextOffset !== value.range.endExclusive ||
+            value.range.nextOffset <= offset
+          : value.range.nextOffset !== undefined)
       ) {
-        return Object.freeze({ status: 'unavailable', attempt });
+        return Object.freeze({ status: 'unavailable', ...context });
       }
       return Object.freeze({
         status: 'available',
-        attempt,
+        ...context,
         content,
         range: value.range,
         truncation: value.truncation,
       });
     } catch (error) {
       if (error instanceof ConsoleRequestError && error.status === 410) {
-        return Object.freeze({ status: 'retired', attempt });
+        return Object.freeze({ status: 'retired', ...context });
       }
       if (error instanceof ConsoleRequestError && error.status === 404) {
-        return Object.freeze({ status: 'not_found', attempt });
+        return Object.freeze({ status: 'not_found', ...context });
       }
-      return Object.freeze({ status: 'unavailable', attempt });
+      return Object.freeze({ status: 'unavailable', ...context });
     }
   }
 
@@ -1609,6 +1648,45 @@
       );
     }
     section.append(header);
+    if (logView.attempt && logView.loadPage && logView.isCurrent) {
+      const actions = element('div', 'detail-actions');
+      let busy = false;
+      const load = async (offset) => {
+        if (busy || !section.isConnected || !logView.isCurrent()) return;
+        busy = true;
+        section.setAttribute('aria-busy', 'true');
+        for (const button of actions.querySelectorAll('button'))
+          button.disabled = true;
+        try {
+          const page = await logView.loadPage(offset);
+          if (!section.isConnected || !logView.isCurrent()) return;
+          section.replaceWith(
+            renderRunLog({
+              ...page,
+              loadPage: logView.loadPage,
+              isCurrent: logView.isCurrent,
+            }),
+          );
+        } finally {
+          busy = false;
+          section.setAttribute('aria-busy', 'false');
+          for (const button of actions.querySelectorAll('button'))
+            button.disabled = false;
+        }
+      };
+      actions.append(actionButton('刷新当前片段', () => load(logView.offset)));
+      if (logView.offset > 0)
+        actions.append(actionButton('回到开头', () => load(0)));
+      if (
+        logView.status === 'available' &&
+        logView.range.nextOffset !== undefined
+      ) {
+        actions.append(
+          actionButton('下一片段', () => load(logView.range.nextOffset)),
+        );
+      }
+      section.append(actions);
+    }
     if (logView.status === 'available') {
       const metadata = [
         `${logView.range.start}–${logView.range.endExclusive} / ${logView.range.totalBytes} bytes`,
@@ -1617,7 +1695,8 @@
       if (logView.truncation?.truncated === 'unknown')
         metadata.push('截断状态未知');
       if (logView.range.nextOffset !== undefined)
-        metadata.push('后续内容可经 API 分页读取');
+        metadata.push('有后续片段；翻页替换当前窗口，不累计全文');
+      metadata.push('按字节分片，跨片段的 UTF-8 字符可能显示替换符');
       section.append(element('p', 'run-log-meta', metadata.join(' · ')));
       section.append(
         element('pre', 'run-log-content', logView.content || '（空日志）'),
diff --git a/packages/ql3-local-api/test/consoleRunLog.test.cjs b/packages/ql3-local-api/test/consoleRunLog.test.cjs
new file mode 100644
index 00000000..a4249082
--- /dev/null
+++ b/packages/ql3-local-api/test/consoleRunLog.test.cjs
@@ -0,0 +1,285 @@
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const path = require('node:path');
+const vm = require('node:vm');
+const { test } = require('node:test');
+
+// Execute the shipped client, with only a DOM/transport fixture and test exports.
+class Node {
+  constructor(tag = 'div') {
+    this.tag = tag;
+    this.children = [];
+    this.dataset = {};
+    this.listeners = {};
+    this.isConnected = true;
+  }
+  set textContent(value) {
+    this.text = value;
+    this.children = [];
+  }
+  get textContent() {
+    return (this.text || '') + this.children.map((x) => x.textContent).join('');
+  }
+  append(...children) {
+    for (const child of children) {
+      child.parent = this;
+      this.children.push(child);
+    }
+  }
+  detach() {
+    this.isConnected = false;
+    for (const child of this.children) child.detach();
+  }
+  replaceChildren(...children) {
+    for (const child of this.children) child.detach();
+    this.children = [];
+    this.append(...children);
+  }
+  replaceWith(node) {
+    const index = this.parent.children.indexOf(this);
+    this.parent.children[index] = node;
+    node.parent = this.parent;
+    this.detach();
+  }
+  setAttribute(name, value) {
+    this[name] = value;
+  }
+  removeAttribute(name) {
+    delete this[name];
+  }
+  addEventListener(name, handler) {
+    this.listeners[name] = handler;
+  }
+  querySelector() {
+    return new Node();
+  }
+  querySelectorAll(selector) {
+    return this.children.flatMap((child) => [
+      ...(selector === child.tag || selector === `.${child.className}`
+        ? [child]
+        : []),
+      ...child.querySelectorAll(selector),
+    ]);
+  }
+}
+
+const run = {
+  id: 'run-a',
+  taskId: 'task-a',
+  status: 'succeeded',
+  latestAttempt: { id: 'attempt-a', attempt: 1, status: 'succeeded' },
+};
+function page(offset = 0, content = 'first', totalBytes = 10) {
+  const endExclusive = offset + Buffer.byteLength(content);
+  return {
+    schema: 'qinglong/run-attempt-log-read-result@v1',
+    status: 'available',
+    projectId: 'default',
+    runId: run.id,
+    attemptId: run.latestAttempt.id,
+    encoding: 'base64',
+    content: Buffer.from(content).toString('base64'),
+    range: {
+      start: offset,
+      endExclusive,
+      totalBytes,
+      ...(endExclusive < totalBytes ? { nextOffset: endExclusive } : {}),
+    },
+    truncation: { truncated: false },
+  };
+}
+function fixture(logResponse = () => page()) {
+  const nodes = new Map();
+  const calls = [];
+  const context = vm.createContext({
+    TextDecoder,
+    Uint8Array,
+    URLSearchParams,
+    Intl,
+    console,
+    window: { atob },
+    document: {
+      getElementById(id) {
+        if (!nodes.has(id)) nodes.set(id, new Node());
+        return nodes.get(id);
+      },
+      querySelector() {
+        return new Node();
+      },
+      createElement: (tag) => new Node(tag),
+      createDocumentFragment: () => new Node('fragment'),
+      addEventListener() {},
+    },
+    fetch: async (url, options) => {
+      calls.push({ url, options });
+      const result = url.includes('/log?')
+        ? await logResponse(url)
+        : url.includes('/events?')
+        ? { events: [] }
+        : url.includes('/steps?')
+        ? { steps: [] }
+        : { run };
+      const status = result.httpStatus || 200;
+      return {
+        ok: status < 400,
+        status,
+        json: async () => result,
+        headers: { get: () => null },
+      };
+    },
+  });
+  const source = fs.readFileSync(
+    path.join(__dirname, '../assets/console/console.js'),
+    'utf8',
+  );
+  assert.ok(source.endsWith('})();\n'));
+  vm.runInContext(
+    source.slice(0, -6) +
+      'globalThis.client = { state, nodes, readRunLog, selectRun };})();',
+    context,
+  );
+  Object.assign(context.client.state, {
+    token: 'test-memory-token',
+    project: 'default',
+    view: 'runs',
+  });
+  return { ...context.client, calls };
+}
+const button = (client, label) =>
+  client.nodes.detail
+    .querySelectorAll('button')
+    .find((node) => node.textContent === label);
+const content = (client) =>
+  client.nodes.detail.querySelectorAll('pre')[0]?.textContent;
+
+test('native log pages replace one bounded window and preserve the Attempt binding', async () => {
+  const client = fixture((url) =>
+    url.includes('offset=5&') ? page(5, 'other') : page(),
+  );
+  await client.selectRun(run.id);
+  assert.equal(content(client), 'first');
+  await button(client, '下一片段').listeners.click();
+  assert.equal(content(client), 'other');
+  assert.equal(client.nodes.detail.querySelectorAll('pre').length, 1);
+  assert.equal(button(client, '下一片段'), undefined);
+  await button(client, '回到开头').listeners.click();
+  assert.equal(content(client), 'first');
+  assert.equal(client.calls.length, 6); // detail/events/steps plus three explicit reads
+  assert.ok(
+    client.calls
+      .filter((x) => x.url.includes('/log?'))
+      .every(
+        (x) =>
+          x.url.includes('/runs/run-a/attempts/attempt-a/log?') &&
+          x.url.endsWith('length=32768'),
+      ),
+  );
+});
+
+test('rejects malformed identity, byte ranges, oversized content and non-progressing cursors', async () => {
+  const invalid = [
+    { ...page(), runId: 'foreign' },
+    { ...page(), projectId: 'foreign' },
+    { ...page(), attemptId: 'foreign' },
+    { ...page(), schema: 'unknown' },
+    { ...page(), content: '***' },
+    { ...page(), content: Buffer.alloc(32769).toString('base64') },
+    ...[
+      { start: 1 },
+      { endExclusive: 4 },
+      { totalBytes: -1 },
+      { nextOffset: 0 },
+      { nextOffset: 6 },
+      { nextOffset: undefined },
+      { totalBytes: 5 },
+      { totalBytes: Number.MAX_SAFE_INTEGER + 1 },
+    ].map((range) => ({ ...page(), range: { ...page().range, ...range } })),
+  ];
+  for (const value of invalid) {
+    const client = fixture(() => value);
+    assert.equal((await client.readRunLog(run)).status, 'unavailable');
+  }
+  const client = fixture();
+  assert.equal((await client.readRunLog(run, -1)).status, 'unavailable');
+  assert.equal(client.calls.length, 0);
+});
+
+test('coalesces repeated clicks and discards a page after switching away', async () => {
+  let finish;
+  const client = fixture((url) =>
+    url.includes('offset=5&')
+      ? new Promise((resolve) => {
+          finish = resolve;
+        })
+      : page(),
+  );
+  await client.selectRun(run.id);
+  const next = button(client, '下一片段');
+  const pending = next.listeners.click();
+  await next.listeners.click();
+  assert.equal(client.calls.length, 5);
+  assert.equal(next.disabled, true);
+  client.state.view = 'tasks';
+  finish(page(5, 'other'));
+  await pending;
+  assert.equal(content(client), 'first');
+});
+
+test('discards stale initial reads on re-selection and disconnect', async () => {
+  const finishes = [];
+  const client = fixture(
+    () => new Promise((resolve) => finishes.push(resolve)),
+  );
+  const old = client.selectRun(run.id);
+  while (finishes.length < 1)
+    await new Promise((resolve) => setImmediate(resolve));
+  const newer = client.selectRun(run.id);
+  while (finishes.length < 2)
+    await new Promise((resolve) => setImmediate(resolve));
+  finishes[1](page(0, 'newer'));
+  await newer;
+  finishes[0](page(0, 'older'));
+  await old;
+  assert.equal(content(client), 'newer');
+  const pending = button(client, '下一片段').listeners.click();
+  client.state.token = null;
+  finishes[2](page(5, 'other'));
+  await pending;
+  assert.equal(content(client), 'newer');
+});
+
+test('renders pending, retention, denial and unavailable states without a continuation', async () => {
+  for (const [result, expected] of [
+    [{ ...page(), status: 'pending', httpStatus: 202 }, 'pending'],
+    [{ httpStatus: 410 }, 'retired'],
+    [{ httpStatus: 404 }, 'not_found'],
+    [{ httpStatus: 401 }, 'unavailable'],
+    [{ httpStatus: 503 }, 'unavailable'],
+  ]) {
+    const client = fixture(() => result);
+    await client.selectRun(run.id);
+    assert.equal(
+      client.nodes.detail.querySelectorAll('.run-log')[0].dataset.state,
+      expected,
+    );
+    assert.equal(button(client, '下一片段'), undefined);
+    assert.ok(button(client, '刷新当前片段'));
+  }
+});
+
+test('accepts empty EOF, a full window and bounded UTF-8 replacement at a byte boundary', async () => {
+  for (const [value, offset] of [
+    [page(0, '', 0), 0],
+    [page(10, '', 10), 20],
+    [page(0, 'a'.repeat(32768), 32768), 0],
+  ]) {
+    const client = fixture(() => value);
+    assert.equal((await client.readRunLog(run, offset)).status, 'available');
+  }
+  const value = page(0, 'a', 1);
+  value.content = Buffer.from([0xe4]).toString('base64');
+  const client = fixture(() => value);
+  const result = await client.readRunLog(run);
+  assert.equal(result.status, 'available');
+  assert.equal(result.content, '\uFFFD');
+});