v0.2.0 — Zero-dependency SDK download and full documentation rewrite

Changed

• Zero-dependency SDK download — automatic Android SDK setup without Android Studio (Java 17+, disk space check, CDN download, license acceptance, default AVD creation)
• Full documentation rewrite for GitHub and VS Code Marketplace
• README rewritten as polished marketplace listing
• QUICKSTART updated with auto-download as primary path
• SETUP_GUIDE reorganized with three setup options and download troubleshooting
• ARCHITECTURE updated with SdkDownloader module and SDK download flow
• CLAUDE.md pre-commit checklist now lists all documentation files
• Added ESLint configuration