[ui] Add semantic primitive ownership Build a layered Zenbu token and sizing system, make authored controls use native-underneath primitives, migrate mrjunejune without imposing visual surfaces, and document/enforce HTML ownership in the catalog and wiki. Co-authored-by: Copilot <[email protected]>

import React from 'react';
import ReactDOM from 'react-dom/client';
import { App } from "hg-web/src/components/app";

const root = ReactDOM.createRoot(document.getElementById('root')!);
root.render(<App />);