Rebrand to ADS 3.0 Design System and add DESIGN.md component reference

Convert from Research Synthesiser-specific project to general-purpose ADS 3.0
design system intended to be forked for downstream applications. Add DESIGN.md
following Google Labs spec as machine-readable reference for AI coding agents.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -1,73 +1,32 @@
-# React + TypeScript + Vite
+# ADS 3.0 Design System
 
-This template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.
+A React component library implementing the ADS 3.0 (Adaptive Design System) design language. Built with React 19, TypeScript, Tailwind CSS v4, and Storybook 10.
 
-Currently, two official plugins are available:
+## Getting Started
 
-- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react) uses [Oxc](https://oxc.rs)
-- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react-swc) uses [SWC](https://swc.rs/)
-
-## React Compiler
-
-The React Compiler is not enabled on this template because of its impact on dev & build performances. To add it, see [this documentation](https://react.dev/learn/react-compiler/installation).
-
-## Expanding the ESLint configuration
-
-If you are developing a production application, we recommend updating the configuration to enable type-aware lint rules:
-
-```js
-export default defineConfig([
-  globalIgnores(['dist']),
-  {
-    files: ['**/*.{ts,tsx}'],
-    extends: [
-      // Other configs...
-
-      // Remove tseslint.configs.recommended and replace with this
-      tseslint.configs.recommendedTypeChecked,
-      // Alternatively, use this for stricter rules
-      tseslint.configs.strictTypeChecked,
-      // Optionally, add this for stylistic rules
-      tseslint.configs.stylisticTypeChecked,
-
-      // Other configs...
-    ],
-    languageOptions: {
-      parserOptions: {
-        project: ['./tsconfig.node.json', './tsconfig.app.json'],
-        tsconfigRootDir: import.meta.dirname,
-      },
-      // other options...
-    },
-  },
-])
+```bash
+npm install
+npm run storybook    # Component development at localhost:6006
+npm run dev          # Vite dev server
 ```
 
-You can also install [eslint-plugin-react-x](https://github.com/Rel1cx/eslint-react/tree/main/packages/plugins/eslint-plugin-react-x) and [eslint-plugin-react-dom](https://github.com/Rel1cx/eslint-react/tree/main/packages/plugins/eslint-plugin-react-dom) for React-specific lint rules:
+## Architecture
 
-```js
-// eslint.config.js
-import reactX from 'eslint-plugin-react-x'
-import reactDom from 'eslint-plugin-react-dom'
+- **Tokens** — Design tokens in `src/tokens/tokens.css` as a Tailwind v4 `@theme` block
+- **Atoms** — Single-purpose elements (Button, Input, Badge, etc.)
+- **Molecules** — Small compositions (Alert, Dialog, Card, Accordion)
+- **Organisms** — Page-level regions (AppShell, TabBar)
 
-export default defineConfig([
-  globalIgnores(['dist']),
-  {
-    files: ['**/*.{ts,tsx}'],
-    extends: [
-      // Other configs...
-      // Enable lint rules for React
-      reactX.configs['recommended-typescript'],
-      // Enable lint rules for React DOM
-      reactDom.configs.recommended,
-    ],
-    languageOptions: {
-      parserOptions: {
-        project: ['./tsconfig.node.json', './tsconfig.app.json'],
-        tsconfigRootDir: import.meta.dirname,
-      },
-      // other options...
-    },
-  },
-])
-```
+## Usage as a Base
+
+This repo is designed to be forked for specific applications. Fork it, then build your application screens and domain logic on top of the shared component set.
+
+## Tech Stack
+
+| Tool | Purpose |
+|------|---------|
+| React 19 | UI framework |
+| TypeScript (strict) | Type safety |
+| Tailwind CSS v4 | Utility-first styling via CSS-first config |
+| Storybook 10 | Component development and documentation |
+| Vite | Build tooling |