mobile-dev-inc/Maestro ? reverse-engineered prompt

Build me an open source tool like Maestro that makes end to end testing feel simple for mobile and web apps.

I want someone to be able to write easy YAML test flows with commands like launch the app, tap a button, type text, and check that something is visible. It should work for Android, iOS, and browser based apps, and run against emulators, simulators, real devices, or a browser.

Please include a command line tool that can install easily, run a flow file, show useful errors, and avoid flaky tests by waiting automatically instead of making people add sleeps everywhere. Add a small sample test for a contacts style app so it’s clear how the YAML works.

Keep it developer friendly but not overly complicated. The goal is that a tester can write and run their first UI test in a few minutes. Use Kotlin if that makes sense for the core implementation, and look up current platform automation docs online if you need to.