Expert guidance on Kotlin Coroutines — structured concurrency, dispatcher selection, race condition prevention (Mutex/Channel/StateFlow), error propagation, Flow patterns, testing with runTest/TestDispatcher, and production optimization. Use this skill whenever the user writes coroutine code, asks about async Kotlin, needs help with concurrency bugs, race conditions, CoroutineScope lifecycle, suspend functions, Flow operators, or anything related to kotlinx.coroutines.
