diff --git a/docs/issues/README.md b/docs/issues/README.md
index 150b66e3..3a8efaf3 100644
--- a/docs/issues/README.md
+++ b/docs/issues/README.md
@@ -34,7 +34,7 @@
 | 02 | A | 待办栏接数据 | ✅ 上游已实现 | 01 | 中 |
 | 03 | A | 待办→证据跳转 | ✅ 已合并 PR#9 | 02 | 中 |
 | 04 | A | Markdown 渲染 | ✅ 已合并 PR#10 | 01 | 低 |
-| 05 | A | 专家模式开关 | ⬜ | 01 | 低 |
+| 05 | A | 专家模式开关 | ✅ 单测+浏览器实证绿,待开 PR | 01 | 低 |
 | 06 | A | 待回应分区（占位） | ⬜ | 02 | 中 |
 | 07 | B | 本地去 Docker（路线A:07a–07c） | ✅ 已合并 PR#8 | 00 | 中 |
 
diff --git a/docs/issues/STEP-05-expert-mode.md b/docs/issues/STEP-05-expert-mode.md
index 37d08ca5..f63c43f7 100644
--- a/docs/issues/STEP-05-expert-mode.md
+++ b/docs/issues/STEP-05-expert-mode.md
@@ -1,7 +1,7 @@
 # STEP-05：专家模式开关（收纳被砍视图）
 
 - 线:A（前端三栏）
-- 状态:⬜ 未开始
+- 状态:✅ 单测+浏览器实证绿,待开 PR
 - 依赖:STEP-01
 - 对应 PR:`Claude/expert-mode`
 
@@ -38,8 +38,19 @@ revert 单 PR；专家入口消失，主三栏不受影响。
 
 ## 实际反馈（执行后由你回填）
 
-- 构建:
-- 测试:
-- 行为:
+- 构建:✅ `npm run build` 通过。
+- 测试:✅ `npm test` **127 文件 / 1352 用例全绿,0 回归**。新增 `test/viewer-expert-mode.test.ts` 5 用例(默认关→折回主三栏且无进阶组、`?expert=1` 放行隐藏 tab、localStorage 开渲染 9 个进阶按钮、`?expert=0` 覆盖 localStorage、renderExpertTabs 幂等不重复)。
+- 浏览器实证:`preview_eval` + `preview_inspect` 实跑——开启后 `#tab-expert-group` 渲染 9 个标签(记忆/经验/图谱/时间线/实时/档案/审计/回放/结晶),逐个 `switchTab` 到 9 个隐藏视图**均不抛错**、console 无 error;关闭后进阶组被移除(getElementById 返回 null)。
+- 实际改动（仅 `src/viewer/index.html`）:
+  1. 新增 `EXPERT_TABS`(9 项 id+label)、`expertModeEnabled()`(读 `?expert=1/0` 优先,否则 localStorage `viewer_expert_mode`)、`setExpertMode()`。
+  2. `normalizeTab`:专家模式开 + tab 属 EXPERT_TABS → 放行;否则维持 TAB_REDIRECTS 折回。**TAB_IDS/TAB_REDIRECTS 常量未改**(默认行为零变化)。
+  3. `renderExpertTabs()`:幂等渲染进阶按钮组到 `.tab-main`;`toggleExpertMode()`:翻转+重渲染,关闭时若停在隐藏视图则折回 dashboard。
+  4. 导航 `.tab-side-meta` 加「专家」开关按钮(`#expert-toggle`,`aria-pressed`);tab-bar 点击委托新增 `#expert-toggle` 分支。
+  5. boot 处调 `renderExpertTabs()`。
+- **清理(STEP-01 遗留死代码)**:删除 `switchTab` 里对已不存在的 `tab-extra`/`tab-extra-toggle` DOM 的死引用块、未用的 `advancedTabs` 局部变量;tab-bar 点击委托里移除旧 `#tab-extra-toggle` 分支(整段替换为 `#expert-toggle`)。
 - 与预测的差异:
-- 下一步影响:
+  - 预测「放行隐藏视图可能首次暴露既有运行时错误」——**实测 9 个视图 switchTab 均不抛错、无 console error**,数据格式未漂移。比预期顺利。
+  - 一处源码健壮性修复:`renderExpertTabs` 移除旧组时加 `existing.parentNode` 判空(原 `existing.parentNode.removeChild` 在 parentNode 缺失时会炸),顺带让 STEP-03/04 等共用沙箱测试的 boot 期 `renderExpertTabs()` 不受影响。
+- 下一步影响(下游待更新清单):
+  - 无对 STEP-06 的代码影响。
+  - 被收纳视图里若展示 Agent 文本,可复用 STEP-04 的 `renderMarkdownSafe`(目前未接,各视图维持原渲染)。
diff --git a/src/viewer/index.html b/src/viewer/index.html
index e1b55257..4496ab9a 100644
--- a/src/viewer/index.html
+++ b/src/viewer/index.html
@@ -220,6 +220,42 @@
       background: var(--bg-alt);
     }
     .tab-bar button.active .tab-icon { opacity: 1; }
+    .tab-expert-group {
+      display: flex;
+      flex-direction: column;
+      gap: 2px;
+      margin-top: 6px;
+      padding-top: 6px;
+      border-top: 1px dashed var(--border, #d8dce1);
+    }
+    .tab-expert-group::before {
+      content: "进阶";
+      font-size: 9px;
+      letter-spacing: 0.1em;
+      color: var(--ink-faint, #9aa0a6);
+      padding: 2px 10px 4px;
+      text-transform: uppercase;
+    }
+    .tab-expert-btn .tab-icon { display: none; }
+    .expert-toggle {
+      appearance: none;
+      border: 1px solid var(--border, #d8dce1);
+      background: none;
+      color: var(--ink-muted, #6b7280);
+      font-family: var(--font-ui);
+      font-size: 10px;
+      letter-spacing: 0.06em;
+      padding: 4px 8px;
+      border-radius: 6px;
+      cursor: pointer;
+      transition: color 0.15s, border-color 0.15s, background 0.15s;
+    }
+    .expert-toggle:hover { color: var(--ink); border-color: var(--border-heavy, #b8bdc4); }
+    .expert-toggle[aria-pressed="true"] {
+      color: var(--ink);
+      background: var(--bg-alt);
+      border-color: var(--border-heavy, #b8bdc4);
+    }
     .tab-extra-toggle {
       margin: 4px 8px;
       padding: 6px 8px;
@@ -3614,6 +3650,7 @@ <h1>灵感记忆台</h1>
       <button data-tab="sessions"><span class="tab-icon"><svg viewBox="0 0 24 24" fill="none" stroke-width="1.9" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><rect x="3" y="5" width="18" height="14" rx="2"/><path d="M7 9h10M7 13h6"/></svg></span>证据</button>
     </div>
     <div class="tab-side-meta">
+      <button id="expert-toggle" type="button" class="expert-toggle" aria-pressed="false" aria-label="专家模式" title="专家模式:显示记忆/图谱/审计等进阶视图">专家</button>
       <a href="https://github.com/MaimoryLab/agentmemory-lab" target="_blank" rel="noopener" aria-label="仓库" title="仓库"><span class="side-icon icon-repo"></span></a>
       <a href="https://github.com/MaimoryLab/agentmemory-lab#readme" target="_blank" rel="noopener" aria-label="文档" title="文档"><span class="side-icon icon-docs"></span></a>
       <a id="footer-feedback" href="#" target="_blank" rel="noopener" aria-label="反馈" title="反馈"><span class="side-icon icon-feedback"></span></a>
@@ -3743,6 +3780,63 @@ <h1>灵感记忆台</h1>
     var CB_STATE_COLORS = { closed: 'badge-green', open: 'badge-red', 'half-open': 'badge-yellow' };
     var TAB_IDS = ['dashboard', 'actions', 'sessions'];
     var TAB_REDIRECTS = { memories: 'dashboard', lessons: 'dashboard', activity: 'sessions', graph: 'dashboard', profile: 'dashboard', audit: 'dashboard', replay: 'dashboard', timeline: 'sessions', crystals: 'dashboard' };
+    // 专家模式:默认三栏干净;开启后在导航末尾恢复被砍/被隐藏的视图(后端资产不丢)。
+    // 这些视图的 view 容器与渲染函数都还在文件里,本步只是放行入口。
+    var EXPERT_TABS = [
+      { id: 'memories', label: '记忆' },
+      { id: 'lessons', label: '经验' },
+      { id: 'graph', label: '图谱' },
+      { id: 'timeline', label: '时间线' },
+      { id: 'activity', label: '实时' },
+      { id: 'profile', label: '档案' },
+      { id: 'audit', label: '审计' },
+      { id: 'replay', label: '回放' },
+      { id: 'crystals', label: '结晶' }
+    ];
+    function expertModeEnabled() {
+      try {
+        var q = new URLSearchParams(window.location.search);
+        if (q.get('expert') === '1') return true;
+        if (q.get('expert') === '0') return false;
+      } catch (_) {}
+      try { return localStorage.getItem('viewer_expert_mode') === '1'; } catch (_) { return false; }
+    }
+    function setExpertMode(on) {
+      try { localStorage.setItem('viewer_expert_mode', on ? '1' : '0'); } catch (_) {}
+    }
+    // 把被隐藏视图的按钮渲染进导航(仅专家模式)。幂等:每次先清掉旧的再按需重建。
+    function renderExpertTabs() {
+      var bar = document.getElementById('tab-bar');
+      if (!bar) return;
+      var on = expertModeEnabled();
+      var existing = document.getElementById('tab-expert-group');
+      if (existing && existing.parentNode) existing.parentNode.removeChild(existing);
+      var toggle = document.getElementById('expert-toggle');
+      if (toggle) toggle.setAttribute('aria-pressed', on ? 'true' : 'false');
+      if (!on) return;
+      var main = bar.querySelector('.tab-main');
+      if (!main) return;
+      var group = document.createElement('span');
+      group.id = 'tab-expert-group';
+      group.className = 'tab-expert-group';
+      EXPERT_TABS.forEach(function(t) {
+        var b = document.createElement('button');
+        b.setAttribute('data-tab', t.id);
+        b.className = 'tab-expert-btn';
+        b.textContent = t.label;
+        group.appendChild(b);
+      });
+      main.appendChild(group);
+    }
+    function toggleExpertMode() {
+      var next = !expertModeEnabled();
+      setExpertMode(next);
+      renderExpertTabs();
+      // 关闭时若当前停在被隐藏视图,折回总览
+      if (!next && EXPERT_TABS.some(function(t) { return t.id === state.activeTab; })) {
+        switchTab('dashboard');
+      }
+    }
 
     var LOCAL_SKILLS = [{"name":"academic-cv-builder","root":"Agents","path":"~/.agents/skills/academic-cv-builder/SKILL.md"},{"name":"career-changer-translator","root":"Agents","path":"~/.agents/skills/career-changer-translator/SKILL.md"},{"name":"cover-letter-generator","root":"Agents","path":"~/.agents/skills/cover-letter-generator/SKILL.md"},{"name":"creative-portfolio-resume","root":"Agents","path":"~/.agents/skills/creative-portfolio-resume/SKILL.md"},{"name":"executive-resume-writer","root":"Agents","path":"~/.agents/skills/executive-resume-writer/SKILL.md"},{"name":"find-skills","root":"Agents","path":"~/.agents/skills/find-skills/SKILL.md"},{"name":"guizang-social-card-skill","root":"Agents","path":"~/.agents/skills/guizang-social-card-skill/SKILL.md"},{"name":"huashu-design","root":"Agents","path":"~/.agents/skills/huashu-design/SKILL.md"},{"name":"interview-prep-generator","root":"Agents","path":"~/.agents/skills/interview-prep-generator/SKILL.md"},{"name":"job-description-analyzer","root":"Agents","path":"~/.agents/skills/job-description-analyzer/SKILL.md"},{"name":"linkedin-profile-optimizer","root":"Agents","path":"~/.agents/skills/linkedin-profile-optimizer/SKILL.md"},{"name":"offer-comparison-analyzer","root":"Agents","path":"~/.agents/skills/offer-comparison-analyzer/SKILL.md"},{"name":"pdf","root":"Agents","path":"~/.agents/skills/pdf/SKILL.md"},{"name":"portfolio-case-study-writer","root":"Agents","path":"~/.agents/skills/portfolio-case-study-writer/SKILL.md"},{"name":"post-to-xhs","root":"Agents","path":"~/.agents/skills/xiaohongshu/skills/post-to-xhs/SKILL.md"},{"name":"reference-list-builder","root":"Agents","path":"~/.agents/skills/reference-list-builder/SKILL.md"},{"name":"resume-ats-optimizer","root":"Agents","path":"~/.agents/skills/resume-ats-optimizer/SKILL.md"},{"name":"resume-bullet-writer","root":"Agents","path":"~/.agents/skills/resume-bullet-writer/SKILL.md"},{"name":"resume-formatter","root":"Agents","path":"~/.agents/skills/resume-formatter/SKILL.md"},{"name":"resume-quantifier","root":"Agents","path":"~/.agents/skills/resume-quantifier/SKILL.md"},{"name":"resume-section-builder","root":"Agents","path":"~/.agents/skills/resume-section-builder/SKILL.md"},{"name":"resume-tailor","root":"Agents","path":"~/.agents/skills/resume-tailor/SKILL.md"},{"name":"resume-version-manager","root":"Agents","path":"~/.agents/skills/resume-version-manager/SKILL.md"},{"name":"salary-negotiation-prep","root":"Agents","path":"~/.agents/skills/salary-negotiation-prep/SKILL.md"},{"name":"setup-xhs-mcp","root":"Agents","path":"~/.agents/skills/xiaohongshu/skills/setup-xhs-mcp/SKILL.md"},{"name":"social-media-marketing","root":"Agents","path":"~/.agents/skills/social-media-marketing/SKILL.md"},{"name":"tech-resume-optimizer","root":"Agents","path":"~/.agents/skills/tech-resume-optimizer/SKILL.md"},{"name":"weread-skills","root":"Agents","path":"~/.agents/skills/weread-skills/SKILL.md"},{"name":"x-twitter-growth","root":"Agents","path":"~/.agents/skills/x-twitter-growth/SKILL.md"},{"name":"xhs-content-plan","root":"Agents","path":"~/.agents/skills/xiaohongshu/skills/xhs-content-plan/SKILL.md"},{"name":"xhs-explore","root":"Agents","path":"~/.agents/skills/xiaohongshu/skills/xhs-explore/SKILL.md"},{"name":"xhs-interact","root":"Agents","path":"~/.agents/skills/xiaohongshu/skills/xhs-interact/SKILL.md"},{"name":"xhs-login","root":"Agents","path":"~/.agents/skills/xiaohongshu/skills/xhs-login/SKILL.md"},{"name":"xhs-profile","root":"Agents","path":"~/.agents/skills/xiaohongshu/skills/xhs-profile/SKILL.md"},{"name":"xhs-search","root":"Agents","path":"~/.agents/skills/xiaohongshu/skills/xhs-search/SKILL.md"},{"name":"xiaohongshu","root":"Agents","path":"~/.agents/skills/xiaohongshu/SKILL.md"},{"name":"academic-cv-builder","root":"Codex","path":"~/.codex/skills/academic-cv-builder/SKILL.md"},{"name":"aihot","root":"Codex","path":"~/.codex/skills/aihot/SKILL.md"},{"name":"andrej-karpathy-perspective","root":"Codex","path":"~/.codex/skills/nuwa-skill/examples/andrej-karpathy-perspective/SKILL.md"},{"name":"buddyup-next","root":"Codex","path":"~/.codex/skills/buddyup-next/SKILL.md"},{"name":"buddyup-study-abroad-assistant","root":"Codex","path":"~/.codex/skills/buddyup-study-abroad-assistant/SKILL.md"},{"name":"buddyup-xiaohongshu-growth","root":"Codex","path":"~/.codex/skills/buddyup-xiaohongshu-growth/SKILL.md"},{"name":"cai-life-skill","root":"Codex","path":"~/.codex/skills/cai-life-skill/SKILL.md"},{"name":"career-changer-translator","root":"Codex","path":"~/.codex/skills/career-changer-translator/SKILL.md"},{"name":"chatgpt-apps","root":"Codex","path":"~/.codex/skills/chatgpt-apps/SKILL.md"},{"name":"cli-creator","root":"Codex","path":"~/.codex/skills/cli-creator/SKILL.md"},{"name":"cocoloop-main","root":"Codex","path":"~/.codex/skills/cocoloop-main/SKILL.md"},{"name":"cover-letter-generator","root":"Codex","path":"~/.codex/skills/cover-letter-generator/SKILL.md"},{"name":"creative-portfolio-resume","root":"Codex","path":"~/.codex/skills/creative-portfolio-resume/SKILL.md"},{"name":"douban-sync-skill","root":"Codex","path":"~/.codex/skills/douban-sync-skill/SKILL.md"},{"name":"elon-musk-perspective","root":"Codex","path":"~/.codex/skills/nuwa-skill/examples/elon-musk-perspective/SKILL.md"},{"name":"executive-resume-writer","root":"Codex","path":"~/.codex/skills/executive-resume-writer/SKILL.md"},{"name":"feishu-research-docs","root":"Codex","path":"~/.codex/skills/feishu-research-docs/SKILL.md"},{"name":"feynman-perspective","root":"Codex","path":"~/.codex/skills/nuwa-skill/examples/feynman-perspective/SKILL.md"},{"name":"figma-code-connect-components","root":"Codex","path":"~/.codex/skills/figma-code-connect-components/SKILL.md"},{"name":"figma-create-design-system-rules","root":"Codex","path":"~/.codex/skills/figma-create-design-system-rules/SKILL.md"},{"name":"figma","root":"Codex","path":"~/.codex/skills/figma/SKILL.md"},{"name":"gh-address-comments","root":"Codex","path":"~/.codex/skills/gh-address-comments/SKILL.md"},{"name":"hv-analysis","root":"Codex","path":"~/.codex/skills/hv-analysis/SKILL.md"},{"name":"ilya-sutskever-perspective","root":"Codex","path":"~/.codex/skills/nuwa-skill/examples/ilya-sutskever-perspective/SKILL.md"},{"name":"imagegen","root":"Codex","path":"~/.codex/skills/.system/imagegen/SKILL.md"},{"name":"interview-prep-generator","root":"Codex","path":"~/.codex/skills/interview-prep-generator/SKILL.md"},{"name":"job-description-analyzer","root":"Codex","path":"~/.codex/skills/job-description-analyzer/SKILL.md"},{"name":"kevin-kelly-perspective","root":"Codex","path":"~/.codex/skills/kevin-kelly-perspective/SKILL.md"},{"name":"khazix-writer","root":"Codex","path":"~/.codex/skills/khazix-writer/SKILL.md"},{"name":"laws-of-ux-2","root":"Codex","path":"~/.codex/skills/laws-of-ux-2/SKILL.md"},{"name":"linkedin-profile-optimizer","root":"Codex","path":"~/.codex/skills/linkedin-profile-optimizer/SKILL.md"},{"name":"mrbeast-perspective","root":"Codex","path":"~/.codex/skills/nuwa-skill/examples/mrbeast-perspective/SKILL.md"},{"name":"munger-perspective","root":"Codex","path":"~/.codex/skills/nuwa-skill/examples/munger-perspective/SKILL.md"},{"name":"naval-perspective","root":"Codex","path":"~/.codex/skills/nuwa-skill/examples/naval-perspective/SKILL.md"},{"name":"neat-freak","root":"Codex","path":"~/.codex/skills/neat-freak/SKILL.md"},{"name":"nuwa-skill","root":"Codex","path":"~/.codex/skills/nuwa-skill/SKILL.md"},{"name":"offer-comparison-analyzer","root":"Codex","path":"~/.codex/skills/offer-comparison-analyzer/SKILL.md"},{"name":"openai-docs","root":"Codex","path":"~/.codex/skills/.system/openai-docs/SKILL.md"},{"name":"paul-graham-perspective","root":"Codex","path":"~/.codex/skills/nuwa-skill/examples/paul-graham-perspective/SKILL.md"},{"name":"playwright","root":"Codex","path":"~/.codex/skills/playwright/SKILL.md"},{"name":"plugin-creator","root":"Codex","path":"~/.codex/skills/.system/plugin-creator/SKILL.md"},{"name":"portfolio-case-study-writer","root":"Codex","path":"~/.codex/skills/portfolio-case-study-writer/SKILL.md"},{"name":"proactive-everme","root":"Codex","path":"~/.codex/skills/proactive-everme/SKILL.md"},{"name":"reference-list-builder","root":"Codex","path":"~/.codex/skills/reference-list-builder/SKILL.md"},{"name":"resume-ats-optimizer","root":"Codex","path":"~/.codex/skills/resume-ats-optimizer/SKILL.md"},{"name":"resume-bullet-writer","root":"Codex","path":"~/.codex/skills/resume-bullet-writer/SKILL.md"},{"name":"resume-formatter","root":"Codex","path":"~/.codex/skills/resume-formatter/SKILL.md"},{"name":"resume-quantifier","root":"Codex","path":"~/.codex/skills/resume-quantifier/SKILL.md"},{"name":"resume-section-builder","root":"Codex","path":"~/.codex/skills/resume-section-builder/SKILL.md"},{"name":"resume-tailor","root":"Codex","path":"~/.codex/skills/resume-tailor/SKILL.md"},{"name":"resume-version-manager","root":"Codex","path":"~/.codex/skills/resume-version-manager/SKILL.md"},{"name":"salary-negotiation-prep","root":"Codex","path":"~/.codex/skills/salary-negotiation-prep/SKILL.md"},{"name":"self-improvement","root":"Codex","path":"~/.codex/skills/self-improvement/SKILL.md"},{"name":"skill-creator","root":"Codex","path":"~/.codex/skills/.system/skill-creator/SKILL.md"},{"name":"skill-installer","root":"Codex","path":"~/.codex/skills/.system/skill-installer/SKILL.md"},{"name":"speech","root":"Codex","path":"~/.codex/skills/speech/SKILL.md"},{"name":"steve-jobs-perspective","root":"Codex","path":"~/.codex/skills/nuwa-skill/examples/steve-jobs-perspective/SKILL.md"},{"name":"storage-analyzer","root":"Codex","path":"~/.codex/skills/storage-analyzer/SKILL.md"},{"name":"sun-yuchen-perspective","root":"Codex","path":"~/.codex/skills/nuwa-skill/examples/sun-yuchen-perspective/SKILL.md"},{"name":"taleb-perspective","root":"Codex","path":"~/.codex/skills/nuwa-skill/examples/taleb-perspective/SKILL.md"},{"name":"taught-master-applications","root":"Codex","path":"~/.codex/skills/taught-mast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and-diff","root":"Plugin","path":"~/.codex/plugins/cache/understand-anything/plugin-backup-Q98O9D/understand-anything/2.7.5/skills/understand-diff/SKILL.md"},{"name":"understand-diff","root":"Plugin","path":"~/.codex/plugins/cache/understand-anything/understand-anything/2.7.6/skills/understand-diff/SKILL.md"},{"name":"understand-domain","root":"Plugin","path":"~/.codex/plugins/cache/understand-anything/plugin-backup-Q98O9D/understand-anything/2.7.5/skills/understand-domain/SKILL.md"},{"name":"understand-domain","root":"Plugin","path":"~/.codex/plugins/cache/understand-anything/understand-anything/2.7.6/skills/understand-domain/SKILL.md"},{"name":"understand-explain","root":"Plugin","path":"~/.codex/plugins/cache/understand-anything/plugin-backup-Q98O9D/understand-anything/2.7.5/skills/understand-explain/SKILL.md"},{"name":"understand-explain","root":"Plugin","path":"~/.codex/plugins/cache/understand-anything/understand-anything/2.7.6/skills/understand-explain/SKILL.md"},{"name":"understand-knowledge","root":"Plugin","path":"~/.codex/plugins/cache/understand-anything/plugin-backup-Q98O9D/understand-anything/2.7.5/skills/understand-knowledge/SKILL.md"},{"name":"understand-knowledge","root":"Plugin","path":"~/.codex/plugins/cache/understand-anything/understand-anything/2.7.6/skills/understand-knowledge/SKILL.md"},{"name":"understand-onboard","root":"Plugin","path":"~/.codex/plugins/cache/understand-anything/plugin-backup-Q98O9D/understand-anything/2.7.5/skills/understand-onboard/SKILL.md"},{"name":"understand-onboard","root":"Plugin","path":"~/.codex/plugins/cache/understand-anything/understand-anything/2.7.6/skills/understand-onboard/SKILL.md"},{"name":"understand","root":"Plugin","path":"~/.codex/plugins/cache/understand-anything/plugin-backup-Q98O9D/understand-anything/2.7.5/skills/understand/SKILL.md"},{"name":"understand","root":"Plugin","path":"~/.codex/plugins/cache/understand-anything/understand-anything/2.7.6/skills/understand/SKILL.md"},{"name":"url-to-code","root":"Plugin","path":"~/.codex/plugins/cache/role-specific-plugins/product-design/0.1.41/skills/url-to-code/SKILL.md"},{"name":"user-context","root":"Plugin","path":"~/.codex/plugins/cache/role-specific-plugins/product-design/0.1.41/skills/user-context/SKILL.md"}];
 
@@ -4931,6 +5025,10 @@ <h1>灵感记忆台</h1>
 
     function normalizeTab(tab) {
       var normalized = String(tab || '').replace(/^#/, '').toLowerCase();
+      // 专家模式下,被隐藏视图放行;否则按 TAB_REDIRECTS 折回主三栏。
+      if (expertModeEnabled() && EXPERT_TABS.some(function(t) { return t.id === normalized; })) {
+        return normalized;
+      }
       if (TAB_REDIRECTS[normalized]) return TAB_REDIRECTS[normalized];
       return TAB_IDS.indexOf(normalized) >= 0 ? normalized : 'dashboard';
     }
@@ -4956,7 +5054,6 @@ <h1>灵感记忆台</h1>
     function switchTab(tab, opts) {
       opts = opts || {};
       tab = normalizeTab(tab);
-      var advancedTabs = { timeline: true, lessons: true, actions: true, audit: true, replay: true };
       if (state.activeTab === 'replay' && tab !== 'replay' && typeof stopReplayTimer === 'function') {
         stopReplayTimer();
       }
@@ -4976,13 +5073,6 @@ <h1>灵感记忆台</h1>
       document.querySelectorAll('.view').forEach(function(v) {
         v.classList.toggle('active', v.id === 'view-' + tab);
       });
-      var extraPanel = document.getElementById('tab-extra');
-      var extraToggle = document.getElementById('tab-extra-toggle');
-      if (extraPanel && extraToggle) {
-        extraPanel.classList.add('open');
-        extraToggle.setAttribute('aria-expanded', 'true');
-        extraToggle.setAttribute('aria-label', '进阶功能已展开');
-      }
       if (state.flagsConfig) renderFlagBanners(state.flagsConfig);
       loadTab(tab);
     }
@@ -8672,21 +8762,16 @@ <h1>灵感记忆台</h1>
     }
 
     document.getElementById('tab-bar').addEventListener('click', function(e) {
+      var toggle = e.target instanceof Element ? e.target.closest('#expert-toggle') : null;
+      if (toggle) {
+        toggleExpertMode();
+        return;
+      }
       var btn = e.target instanceof Element ? e.target.closest('button[data-tab]') : null;
       if (btn) {
         switchTab(btn.dataset.tab);
         return;
       }
-      var toggle = e.target instanceof Element ? e.target.closest('#tab-extra-toggle') : null;
-      if (toggle) {
-        var panel = document.getElementById('tab-extra');
-        if (!panel) return;
-        var willOpen = !panel.classList.contains('open');
-        panel.classList.toggle('open', willOpen);
-        toggle.setAttribute('aria-expanded', willOpen ? 'true' : 'false');
-        toggle.setAttribute('aria-label', willOpen ? '收起进阶功能' : '展开进阶功能');
-        try { localStorage.setItem('viewer_tab_extra_open', willOpen ? '1' : '0'); } catch {}
-      }
     });
 
     document.addEventListener('click', function(e) {
@@ -9379,6 +9464,7 @@ <h1>灵感记忆台</h1>
       }
     });
 
+    renderExpertTabs();
     switchTab(tabFromRoute(), { replaceRoute: true });
     connectWs();
     startDashboardAutoRefresh();
diff --git a/test/viewer-expert-mode.test.ts b/test/viewer-expert-mode.test.ts
new file mode 100644
index 00000000..fe92825b
--- /dev/null
+++ b/test/viewer-expert-mode.test.ts
@@ -0,0 +1,220 @@
+import * as vm from "node:vm";
+import { describe, expect, it } from "vitest";
+import { renderViewerDocument } from "../src/viewer/document.js";
+
+// STEP-05: 专家模式开关。默认三栏干净;开启后放行被隐藏视图并在导航末尾
+// 渲染进阶按钮。这些用例锁定:① 默认关 → normalizeTab 折回主三栏、无 expert 组
+// ② ?expert=1 / localStorage 开 → 被隐藏 tab 放行、渲染 9 个进阶按钮。
+
+function loadViewerSandbox(opts) {
+  opts = opts || {};
+  const rendered = renderViewerDocument();
+  if (!rendered.found) throw new Error("viewer document not found");
+  const scriptMatch = rendered.html.match(
+    /<script nonce="[^"]+">([\s\S]*?)<\/script>/,
+  );
+  if (!scriptMatch) throw new Error("viewer script not found");
+
+  const store = Object.assign({}, opts.localStorage || {});
+  const makeEl = (id = "") => {
+    const children = [];
+    const attrs = new Map();
+    const classes = new Set();
+    const el = {
+      id,
+      innerHTML: "",
+      textContent: "",
+      style: {},
+      dataset: {},
+      classList: {
+        add: (n) => classes.add(n),
+        remove: (n) => classes.delete(n),
+        contains: (n) => classes.has(n),
+        toggle: (n, f) => {
+          const on = f ?? !classes.has(n);
+          if (on) classes.add(n);
+          else classes.delete(n);
+          return on;
+        },
+      },
+      children,
+      setAttribute: (k, v) => attrs.set(k, String(v)),
+      getAttribute: (k) => (attrs.has(k) ? attrs.get(k) : null),
+      removeAttribute: (k) => attrs.delete(k),
+      addEventListener: () => {},
+      appendChild: (c) => {
+        children.push(c);
+        c.parentNode = el;
+        return c;
+      },
+      removeChild: (c) => {
+        const i = children.indexOf(c);
+        if (i >= 0) children.splice(i, 1);
+        return c;
+      },
+      querySelector: (sel) => {
+        if (sel === ".tab-main") return el._tabMain || null;
+        return null;
+      },
+      querySelectorAll: () => [],
+      scrollIntoView: () => {},
+    };
+    return el;
+  };
+
+  const elements = {};
+  // 模拟真实 DOM:getElementById 先查显式注册单例,再深度搜索已 append 的子树。
+  // 对动态 id(tab-expert-group)严格反映挂载状态(未挂载→null,源码据此判断去重);
+  // 其余未知 id 自动补一个 mock,让 boot 期各种 addEventListener 不炸。
+  function findById(node, id) {
+    if (!node || !node.children) return null;
+    for (const c of node.children) {
+      if (c.id === id) return c;
+      const found = findById(c, id);
+      if (found) return found;
+    }
+    return null;
+  }
+  const DYNAMIC_IDS = new Set(["tab-expert-group"]);
+  const roots = [];
+  const getElement = (id) => {
+    if (elements[id]) return elements[id];
+    for (const r of roots) {
+      const found = r.id === id ? r : findById(r, id);
+      if (found) return found;
+    }
+    if (DYNAMIC_IDS.has(id)) return null;
+    elements[id] = makeEl(id);
+    return elements[id];
+  };
+  // tab-bar 内含 .tab-main(querySelector 命中)
+  const tabBar = makeEl("tab-bar");
+  const tabMain = makeEl("tab-main");
+  tabBar._tabMain = tabMain;
+  tabBar.appendChild(tabMain);
+  elements["tab-bar"] = tabBar;
+  elements["expert-toggle"] = makeEl("expert-toggle");
+  roots.push(tabBar);
+
+  const sandbox = {
+    console: { log() {}, warn() {}, error() {} },
+    document: {
+      documentElement: { dataset: {} },
+      body: makeEl("body"),
+      createElement: () => makeEl(),
+      getElementById: getElement,
+      querySelectorAll: () => [],
+      querySelector: () => null,
+      addEventListener: () => {},
+    },
+    window: {
+      location: {
+        search: opts.search || "",
+        port: "3113",
+        protocol: "http:",
+        hostname: "localhost",
+        host: "localhost:3113",
+        origin: "http://localhost:3113",
+      },
+      matchMedia: () => ({ matches: false }),
+      addEventListener: () => {},
+    },
+    history: { replaceState() {}, pushState() {} },
+    location: { hash: "", pathname: "/", search: opts.search || "" },
+    localStorage: {
+      getItem: (k) => (k in store ? store[k] : null),
+      setItem: (k, v) => {
+        store[k] = String(v);
+      },
+      removeItem: (k) => {
+        delete store[k];
+      },
+    },
+    fetch: async () => ({ ok: true, json: async () => ({}) }),
+    WebSocket: function () {},
+    navigator: { userAgent: "vitest" },
+    Element: function () {},
+    alert() {},
+    setInterval: () => 0,
+    clearInterval() {},
+    setTimeout: () => 0,
+    clearTimeout() {},
+    URLSearchParams,
+    Date,
+    Math,
+    Promise,
+    JSON,
+    Array,
+    Object,
+    String,
+    Number,
+    parseInt,
+    encodeURIComponent,
+    decodeURIComponent,
+  };
+
+  // 去掉 boot 三连(switchTab/connectWs/startDashboardAutoRefresh)避免触发渲染副作用
+  const script = scriptMatch[1]
+    .replace(/\n\s*renderExpertTabs\(\);/, "\n")
+    .replace(/\n\s*switchTab\(tabFromRoute\(\), \{ replaceRoute: true \}\);/, "\n")
+    .replace(/\n\s*connectWs\(\);/, "\n")
+    .replace(/\n\s*startDashboardAutoRefresh\(\);/, "\n");
+
+  vm.createContext(sandbox);
+  vm.runInContext(script, sandbox);
+  return { sandbox, getElement, tabMain };
+}
+
+describe("viewer expert mode (STEP-05)", () => {
+  it("defaults off: hides expert views and redirects them to the core three tabs", () => {
+    const { sandbox } = loadViewerSandbox();
+    expect(sandbox.expertModeEnabled()).toBe(false);
+    expect(sandbox.normalizeTab("graph")).toBe("dashboard");
+    expect(sandbox.normalizeTab("profile")).toBe("dashboard");
+    expect(sandbox.normalizeTab("actions")).toBe("actions");
+    sandbox.renderExpertTabs();
+    // 关闭时不渲染进阶组
+    expect(sandbox.document.getElementById("tab-expert-group")).toBeNull();
+  });
+
+  it("enables via ?expert=1 and lets hidden tabs through normalizeTab", () => {
+    const { sandbox } = loadViewerSandbox({ search: "?expert=1" });
+    expect(sandbox.expertModeEnabled()).toBe(true);
+    expect(sandbox.normalizeTab("graph")).toBe("graph");
+    expect(sandbox.normalizeTab("audit")).toBe("audit");
+  });
+
+  it("enables via localStorage and renders all expert buttons into .tab-main", () => {
+    const { sandbox, tabMain } = loadViewerSandbox({
+      localStorage: { viewer_expert_mode: "1" },
+    });
+    expect(sandbox.expertModeEnabled()).toBe(true);
+    sandbox.renderExpertTabs();
+    const group = tabMain.children.find((c) => c.id === "tab-expert-group");
+    expect(group).toBeTruthy();
+    expect(group.children.length).toBe(sandbox.EXPERT_TABS.length);
+    // 每个进阶按钮带 data-tab
+    group.children.forEach((b) => {
+      expect(b.getAttribute("data-tab")).toBeTruthy();
+    });
+  });
+
+  it("?expert=0 overrides a stored enabled flag", () => {
+    const { sandbox } = loadViewerSandbox({
+      search: "?expert=0",
+      localStorage: { viewer_expert_mode: "1" },
+    });
+    expect(sandbox.expertModeEnabled()).toBe(false);
+    expect(sandbox.normalizeTab("graph")).toBe("dashboard");
+  });
+
+  it("renderExpertTabs is idempotent (no duplicate groups on repeat calls)", () => {
+    const { sandbox, tabMain } = loadViewerSandbox({
+      localStorage: { viewer_expert_mode: "1" },
+    });
+    sandbox.renderExpertTabs();
+    sandbox.renderExpertTabs();
+    const groups = tabMain.children.filter((c) => c.id === "tab-expert-group");
+    expect(groups.length).toBe(1);
+  });
+});
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