Jetpack Compose-first Kotlin patterns for Google/Android platforms: phone, tablet/foldable, Wear OS, Android TV/Google TV, Android Auto, Android Automotive, and AOSP devices (Meta Quest, Fire TV, Fire Tablet). Use whenever the user asks to "build an Android app", "create a Composable" or "add a screen", "set up an Android project", "review/refactor Android code", "build for Wear OS / TV / Auto / Automotive / Quest / Fire", "set up Room, DataStore, or local storage" (including migrations and encryption), "add in-app purchases / subscriptions / Play Billing", "write Android tests" (ViewModel, Composable, Room), "configure Android Lint", or when generating any Kotlin code that targets Android — even if they only mention Jetpack, Compose, or ViewModel. Covers UI, lifecycle, navigation, concurrency, storage, networking, media, billing, testing, Lint, and per-platform guidance. Pairs with `kotlin-development` for language fundamentals. Always generates Kotlin unless the project explicitly requires Java.