feat(arcrun): mira wiki page with tag filter + accumulated WIP

- landing/app/mira/wiki: tag=mira-wiki list now shows all wiki paragraphs
  (depends on KBDB tag filter exposed in matrix/kbdb commit, separate repo)
- landing: app/mira hub + feed split + various WIP from prior sessions
- registry/components: claude_api / kbdb_create_block / kbdb_get / km_writer /
  platform_crypto / auth_oauth2 contracts + main.go (accumulated)
- .component-builds: pkg-lock updates + index.ts adjustments (WIP)
- .agents/specs/arcrun/frontend-redesign: design notes
- docs/test_credentials, docs/user_requirements/arcrun-landing-page: WIP docs
- cypher-executor: auth-dispatcher / wasi-shim adjustments (WIP)

Includes accumulated work from prior sessions plus the wiki UI tag-filter
update that surfaces the AI-generated wiki paragraphs at /mira/wiki.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

docs/user_requirements/arcrun-landing-page/components/chrome.jsx

@@ -0,0 +1,92 @@
+// Top nav and sidebar
+
+const TopNav = ({ onNav, current }) => {
+  const [scrolled, setScrolled] = React.useState(false);
+  React.useEffect(() => {
+    const onScroll = () => setScrolled(window.scrollY > 8);
+    window.addEventListener('scroll', onScroll);
+    return () => window.removeEventListener('scroll', onScroll);
+  }, []);
+  return (
+    <nav className={`topnav ${scrolled ? 'scrolled' : ''}`}>
+      <div className="flex gap-12" style={{alignItems: 'center'}}>
+        <Logo onClick={() => onNav('landing')} />
+        <div className="nav-links" style={{marginLeft: 20}}>
+          <a>Product</a>
+          <a>Docs</a>
+          <a>Pricing</a>
+          <a>Changelog</a>
+        </div>
+      </div>
+      <div className="flex gap-8" style={{alignItems: 'center'}}>
+        <button className="btn btn-ghost" onClick={() => onNav('auth')}>Log in</button>
+        <button className="btn btn-primary" onClick={() => onNav('auth')}>
+          Get started <Icon name="arrow_right" size={14} />
+        </button>
+      </div>
+    </nav>
+  );
+};
+
+const Footer = ({ onNav }) => (
+  <footer className="footer">
+    <div className="flex gap-12" style={{alignItems: 'center'}}>
+      <Logo size="sm" />
+      <span>© 2026 Arcrun Labs</span>
+    </div>
+    <div className="footer-links">
+      <a>Docs</a>
+      <a>Pricing</a>
+      <a>Changelog</a>
+      <a>Status</a>
+      <a>Privacy</a>
+    </div>
+  </footer>
+);
+
+// App shell with sidebar for logged-in screens
+const Sidebar = ({ current, onNav }) => {
+  const items = [
+    { id: 'dashboard', label: 'Dashboard', icon: 'home' },
+    { id: 'apps', label: 'Apps', icon: 'grid', count: 6 },
+    { id: 'workflows', label: 'Workflows', icon: 'workflow', count: 12 },
+    { id: 'keys', label: 'API Keys', icon: 'key' },
+    { id: 'docs', label: 'Docs', icon: 'book' },
+  ];
+  const bottom = [
+    { id: 'settings', label: 'Settings', icon: 'settings' },
+  ];
+  return (
+    <aside className="sidebar">
+      <div className="sidebar-head">
+        <Logo size="md" onClick={() => onNav('landing')} />
+      </div>
+      <div className="sidebar-section">Workspace</div>
+      {items.map(it => (
+        <div key={it.id}
+             className={`sidebar-item ${current === it.id ? 'active' : ''}`}
+             onClick={() => onNav(it.id)}>
+          <span className="sb-ico"><Icon name={it.icon} size={15} /></span>
+          <span>{it.label}</span>
+          {it.count != null && <span className="sb-count">{it.count}</span>}
+        </div>
+      ))}
+      <div style={{flex: 1}} />
+      {bottom.map(it => (
+        <div key={it.id} className="sidebar-item" onClick={() => onNav(it.id)}>
+          <span className="sb-ico"><Icon name={it.icon} size={15} /></span>
+          <span>{it.label}</span>
+        </div>
+      ))}
+      <div className="sidebar-foot">
+        <div className="avatar-circ">MR</div>
+        <div className="meta">
+          <div className="name">Maya Rivera</div>
+          <div className="email">maya@northwind.co</div>
+        </div>
+      </div>
+    </aside>
+  );
+};
+
+Object.assign(window, { TopNav, Footer, Sidebar });