AG X v2.0.3 - Add README, CHANGELOG (.deb available in Releases)

CHANGELOG.md

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+# AG X Changelog
+
+## v2.0.3 (2025-05-22)
+
+### Features
+- **Multi-Provider Support**: Choose between Google OAuth or Custom Provider at first launch
+- **Provider Settings UI**: Built-in settings page to configure custom API endpoints
+- **API Proxy**: Transparent proxy that routes requests to your chosen provider
+- **Translation Proxy**: Supports translation services for multi-language responses
+- **Welcome Screen**: First-run experience lets you select your preferred provider
+- **System Tray Integration**: Minimize to tray with status indicators
+
+### Fixes
+- Fixed provider selection flow - selecting a custom provider now correctly opens the app
+- Fixed endpoint configuration sync between AG X UI and Language Server proxy
+- Fixed OAuth redirect handling for custom providers
+- Fixed settings persistence across app restarts
+
+### Architecture
+- `dist/main.js` - Electron main process with provider orchestration
+- `dist/languageServer.js` - Language Server proxy with endpoint management
+- `dist/provider/welcome.html` - First-run provider selection screen
+- `dist/provider/settings.html` - Provider configuration settings page
+- `dist/providerSettings.js` - Provider settings window management
+- `dist/services/apiProxy.js` - API request proxy to custom endpoints
+- `dist/services/providerService.js` - Provider CRUD operations
+- `dist/services/translationProxy.js` - Translation service proxy
+
+## v2.0.2 (2025-05-22)
+
+- Initial AG X fork from Antigravity
+- Custom provider support
+- Settings UI improvements
+
+## v2.0.1 (2025-05-22)
+
+- Base Antigravity fork
+- Desktop app packaging (.deb)