Initial commit: antigravity-claudekit

skills/ck-mobile-development/SKILL.md

@@ -0,0 +1,89 @@
+---
+name: ck-mobile-development
+description: Build mobile apps with React Native, Flutter, Swift/SwiftUI, Kotlin/Jetpack Compose. Use for iOS/Android development, mobile UX patterns, offline-first architecture, and app store deployment.
+---
+
+# Mobile Development
+
+Production-ready mobile development across React Native, Flutter, Swift, and Kotlin.
+
+## When to Use
+
+- Building iOS, Android, or cross-platform mobile apps
+- Implementing mobile-first UX (offline-first, push notifications, deep linking)
+- Making native vs cross-platform framework decisions
+- Optimizing battery, memory, network for mobile constraints
+- Deploying to App Store or Google Play
+
+## Don't Use When
+
+- Building responsive web apps (use web frameworks instead)
+- Desktop applications (use Electron or native desktop frameworks)
+- Simple PWAs that don't require native capabilities
+
+## Framework Selection
+
+| Need | Choose |
+|------|--------|
+| JavaScript team, web code sharing | React Native |
+| Performance-critical, complex animations | Flutter |
+| Maximum iOS performance, latest features | Swift/SwiftUI |
+| Maximum Android performance, Material 3 | Kotlin/Compose |
+| Rapid prototyping | React Native + Expo |
+| Gaming / heavy graphics | Native or Unity |
+
+## Performance Targets
+
+- Launch: <2s (70% abandon if >3s)
+- Memory: <100MB typical screens
+- Frame rate: 60 FPS (16.67ms/frame)
+- App size: <50MB initial download
+- Battery: <5% drain/hour active use
+
+## Architecture Patterns
+
+- **Small-medium apps:** MVVM
+- **Enterprise:** MVVM + Clean Architecture
+- **State:** Zustand (React Native), Riverpod 3 (Flutter), StateFlow (Android)
+- **Sync:** Offline-first with hybrid push/pull
+
+## Security (OWASP Mobile Top 10)
+
+- OAuth 2.0 + JWT + Biometrics for auth
+- Keychain (iOS) / KeyStore (Android) for secrets
+- Certificate pinning for network security
+- Never hardcode credentials or API keys
+
+## Testing Strategy
+
+- Unit tests: 70%+ coverage for business logic
+- E2E: Detox (React Native), XCUITest (iOS), Espresso (Android)
+- Real device testing mandatory before release
+
+## Platform Guidelines
+
+**iOS (HIG):** Tab bar, navigation bar, San Francisco font, safe areas, haptic feedback
+
+**Android (Material 3):** Bottom nav, FABs, Roboto font, Material You dynamic colors, ripple effects
+
+## Deployment
+
+- Fastlane for automation
+- Staged rollouts: Internal → Closed → Open → Production
+- CI/CD saves ~20% development time
+
+## Common Pitfalls
+
+1. Testing only on simulators (real devices show true performance)
+2. Ignoring platform conventions
+3. No offline handling
+4. Hardcoded credentials
+5. Skipping accessibility (excludes 15%+ of users)
+
+## Resources
+
+- React Native: https://reactnative.dev/
+- Flutter: https://flutter.dev/
+- iOS HIG: https://developer.apple.com/design/human-interface-guidelines/
+- Material Design 3: https://m3.material.io/
+- OWASP Mobile: https://owasp.org/www-project-mobile-top-10/