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>

.agents/specs/arcrun/frontend-redesign/design-source/app.jsx

@@ -0,0 +1,56 @@
+// App root — screen switcher with persistent route
+const { useState, useEffect } = React;
+
+const SCREENS = [
+  { id: 'landing', label: 'Landing' },
+  { id: 'auth', label: 'Auth' },
+  { id: 'dashboard', label: 'Dashboard' },
+  { id: 'keys', label: 'API Keys' },
+  { id: 'workflow', label: 'Workflow' },
+];
+
+// Synonyms from sidebar ids
+const aliases = { apps: 'dashboard', workflows: 'dashboard', docs: 'landing', settings: 'keys' };
+
+function App() {
+  const [screen, setScreen] = useState(() => {
+    const saved = localStorage.getItem('arcrun:screen');
+    return saved && SCREENS.some(s => s.id === saved) ? saved : 'landing';
+  });
+
+  useEffect(() => {
+    localStorage.setItem('arcrun:screen', screen);
+    window.scrollTo(0, 0);
+  }, [screen]);
+
+  const nav = (id) => {
+    const resolved = aliases[id] || id;
+    if (SCREENS.some(s => s.id === resolved)) setScreen(resolved);
+  };
+
+  const Current = {
+    landing: Landing,
+    auth: Auth,
+    dashboard: Dashboard,
+    keys: ApiKeys,
+    workflow: WorkflowViewer,
+  }[screen];
+
+  return (
+    <div className="app">
+      <Current onNav={nav} />
+
+      <div className="proto-switch" role="tablist" aria-label="Screen switcher">
+        {SCREENS.map(s => (
+          <button key={s.id}
+                  className={screen === s.id ? 'active' : ''}
+                  onClick={() => nav(s.id)}>
+            {s.label}
+          </button>
+        ))}
+      </div>
+    </div>
+  );
+}
+
+ReactDOM.createRoot(document.getElementById('root')).render(<App />);