Kotlin Coroutines: async/await for Parallel Results

async starts a coroutine to compute a result in parallel, returning a `Deferred` value—a promise of a future result. `await` then pauses the current coroutine until that result is ready. This is ideal for running independent network calls concurrently, like fetching user data and preferences from different APIs to reduce total wait time. The main footgun is that an exception in an `async` block is only thrown when `await` is called, which can crash the parent coroutine unexpectedly.