cypress-io/cypress ? reverse-engineered prompt

Build me a browser testing tool like Cypress that makes it easy to write and run tests against real web apps.

I want something I can install in a JavaScript project, then use to do end to end tests and component tests for apps built with popular frameworks. It should open a friendly test runner, let me see commands and failures clearly, and make debugging simple when something breaks. I also want a command line experience for installing it, running tests, and showing a clean success or failure result for CI.

Make it feel polished and reliable, with good docs and a nice onboarding flow so someone can get started quickly. If you need to look up current best practices or docs online while building it, go ahead. Focus on the core testing experience first, then add the extra pieces that make it feel like a real production ready open source project.