Check for mobile app updates on launch - #4958

💭 Looking at this PR, it doesn't seem to involve Effect services at all — it's a React Native module using plain promises and a client-runtime helper. The conventions only apply when a pull request creates, moves, refactors, or consumes an Effect service, and things like settlePromise from the client-runtime, the module-level appUpdateCheckInFlight variable, and the createAppUpdateLaunchCheck closure don't appear to be Effect services. Let me check the repo to confirm whether any of these are actually Effect services. These are just utility functions without any Effect service or layer dependencies, so there's nothing to flag. The new file doesn't touch Effect at all, which means I can confirm everything checks out.