Summary

• add interactive MDX playgrounds for A3S TUI and A3S Web in Chinese and English
• map agent-building components to the relevant runtime documentation
• link session, tools, security, tasks, verification, and persistence chapters to UI previews
• rewrite homepage, overview, API, SEO, and social-card copy in clearer product language

Validation

• npm run format:check
• npm run lint
• npm run build
• npm run check:site
• Playwright interaction checks in Edge for TUI themes/scenes, Web run/allow/deny/result flow, SSR output, zh/en, and 390px mobile layout