feat(harness): 用戶 CC harness（acr install-harness）+ 公開 repo 只留對外

讓「用 arcrun 開發」的用戶，他的 CC 自動載入 arcrun 防護、不退回自寫 Python。

新增 user-cc-harness（SDD: .agents/specs/user-cc-harness，本機）：
- acr install-harness：冪等裝進用戶當前專案（新/舊專案皆可），acr init 末尾也順便裝
  - CLAUDE.md arcrun 區塊（標記包夾，append 不破壞既有）
  - .claude/skills/arcrun-mindset（世界觀 + 資源去哪取 acr parts/auth-recipe）
  - .claude/commands/arcrun.md（/arcrun slash command）
  - .claude/hooks/arcrun-guard.sh（python→提醒不硬擋、暴露→exit 2、每條含正路）
  - settings.json 合併 hook（不覆蓋用戶既有 hooks/設定）
- llms.txt + README「給 AI」段：第一接觸點（用戶丟連結，CC 讀了知道第一步 install-harness）
  含 CF 憑證白話照抄式引導（不對用戶講 KV/Worker/R2 術語）
- harness 素材內嵌 npm 套件（cli/harness/，files 帶上），不依賴用戶有 arcrun repo
- 實測：空目錄/冪等/既有檔合併皆通過，tsc exit 0，npm pack 含 harness 5 檔

公開 repo 清理（richblack：用戶要用不要開發 arcrun）：
- git rm --cached 移除開發痕跡 + 思考過程出公開 repo（本機保留供 richblack 開發）：
  .claude/CLAUDE.md/AGENTS.md/.agents/docs/DECISIONS/BACKLOG/landing/.github
- .gitignore 防回流；補 MIT LICENSE

MCP（P7）納入 install-harness/update 的接點已設計，實作待 MCP 對齊（BACKLOG 另一條線）。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/user_requirements/arcrun-landing-page/screens/Dashboard.jsx

@@ -1,126 +0,0 @@
-const Dashboard = ({ onNav }) => {
-  const apps = [
-    { id: 'digest', name: 'Weekly Digest', desc: 'Summarize customer activity into a Monday email for the revenue team.', icon: 'mail', tone: 'indigo' },
-    { id: 'triage', name: 'Support Triage', desc: 'Classify inbound tickets, attach context from the CRM, and route.', icon: 'filter', tone: 'orange' },
-    { id: 'seo', name: 'SEO Brief Generator', desc: 'Turn a keyword into a draft brief with outline, FAQs, and SERP notes.', icon: 'search', tone: 'green' },
-    { id: 'slack', name: 'Standup Bot', desc: 'Collect Linear updates and post a tidy engineering standup to Slack.', icon: 'slack', tone: 'pink' },
-    { id: 'doc', name: 'Docs Sync', desc: 'Keep Notion runbooks in sync with the production API surface.', icon: 'book', tone: 'blue' },
-  ];
-
-  const workflows = [
-    { id: 'digest_weekly', name: 'digest/weekly', nodes: 9, modified: '2 hours ago', runs: '147 runs', status: 'healthy' },
-    { id: 'triage_inbound', name: 'triage/inbound-email', nodes: 14, modified: 'Yesterday', runs: '2,318 runs', status: 'healthy' },
-    { id: 'seo_brief', name: 'seo/brief-from-keyword', nodes: 7, modified: '3 days ago', runs: '42 runs', status: 'healthy' },
-    { id: 'standup', name: 'slack/standup-collector', nodes: 6, modified: '1 week ago', runs: '24 runs', status: 'idle' },
-    { id: 'docs_sync', name: 'docs/sync-notion', nodes: 11, modified: '2 weeks ago', runs: '8 runs', status: 'failed' },
-  ];
-
-  return (
-    <div className="shell">
-      <Sidebar current="dashboard" onNav={onNav} />
-      <div className="main">
-        <div className="main-head">
-          <div>
-            <div className="crumb">
-              <span>Northwind</span>
-              <span className="sep"><Icon name="chevron_right" size={11} /></span>
-              <span>Dashboard</span>
-            </div>
-            <h1>Welcome back, Maya</h1>
-            <div className="sub">5 apps running · 12 workflows · 2,538 runs this week</div>
-          </div>
-          <div className="flex gap-8">
-            <button className="btn btn-secondary"><Icon name="book" size={14} /> Templates</button>
-            <button className="btn btn-primary"><Icon name="plus" size={14} /> New app</button>
-          </div>
-        </div>
-
-        <div className="main-body">
-          {/* Apps grid */}
-          <div className="section-head">
-            <div>
-              <h2>My Apps</h2>
-              <div className="subtle" style={{marginTop: 2}}>Packaged workflows your team can run from chat or code</div>
-            </div>
-            <span className="subtle">{apps.length} apps</span>
-          </div>
-
-          <div className="apps-grid">
-            {apps.map(a => (
-              <div key={a.id} className="app-card">
-                <AppIcon tone={a.tone}><Icon name={a.icon} size={17} /></AppIcon>
-                <h4>{a.name}</h4>
-                <p className="dsc">{a.desc}</p>
-                <div className="row">
-                  <a className="open" onClick={() => onNav('workflow')}>Open app <Icon name="arrow_right" size={12} /></a>
-                  <button className="chip-btn">
-                    <Icon name="spark" size={11} /> Edit in Claude
-                  </button>
-                </div>
-              </div>
-            ))}
-            <div className="app-card app-empty">
-              <div className="plus"><Icon name="plus" size={16} /></div>
-              <div style={{fontSize: 13, fontWeight: 500}}>Create new app</div>
-              <div style={{fontSize: 12, opacity: 0.75}}>Start from scratch or template</div>
-            </div>
-          </div>
-
-          {/* Workflows */}
-          <div className="wf-table">
-            <div className="section-head">
-              <div>
-                <h2>My Workflows</h2>
-                <div className="subtle" style={{marginTop: 2}}>The graphs that power your apps</div>
-              </div>
-              <div className="flex gap-8">
-                <button className="btn btn-secondary btn-sm"><Icon name="filter" size={12} /> All workflows</button>
-                <button className="btn btn-secondary btn-sm" onClick={() => onNav('workflow')}><Icon name="plus" size={12} /> New</button>
-              </div>
-            </div>
-
-            <div className="table-wrap">
-              <table className="table">
-                <thead>
-                  <tr>
-                    <th style={{width: '34%'}}>Workflow</th>
-                    <th>Nodes</th>
-                    <th>Last modified</th>
-                    <th>Activity</th>
-                    <th>Status</th>
-                    <th style={{width: 100, textAlign: 'right'}}></th>
-                  </tr>
-                </thead>
-                <tbody>
-                  {workflows.map(w => (
-                    <tr key={w.id}>
-                      <td>
-                        <div className="wf-row-name">
-                          <span className="dot" />
-                          <span className="mono" style={{fontSize: 13}}>{w.name}</span>
-                        </div>
-                      </td>
-                      <td className="dim">{w.nodes}</td>
-                      <td className="dim" style={{fontSize: 12.5}}>{w.modified}</td>
-                      <td className="dim" style={{fontSize: 12.5}}>{w.runs}</td>
-                      <td>
-                        <span className={`pill ${w.status === 'healthy' ? 'active' : w.status === 'failed' ? 'revoked' : 'idle'}`}>
-                          <span className="pdot" /> {w.status}
-                        </span>
-                      </td>
-                      <td style={{textAlign: 'right'}}>
-                        <button className="btn btn-secondary btn-sm" onClick={() => onNav('workflow')}>View</button>
-                      </td>
-                    </tr>
-                  ))}
-                </tbody>
-              </table>
-            </div>
-          </div>
-        </div>
-      </div>
-    </div>
-  );
-};
-
-window.Dashboard = Dashboard;