Agent Skills: cross-platform-compatibility

This skill enforces cross-platform compatibility best practices for Expo apps targeting iOS, Android, and web. It should be used when creating new features, components, or screens to ensure they work correctly on all platforms. Use this skill when writing platform-specific code, using Platform.OS checks, creating platform-specific files (.web.tsx, .native.tsx, .ios.tsx, .android.tsx), or reviewing code for cross-platform issues.