Ce Test Browser

Automates end-to-end browser testing on pages touched by your PR or branch using agent-browser. It diffs your changes against main, maps affected files to routes (views, controllers, Stimulus controllers, components), then systematically opens each page, captures snapshots, and verifies elements render correctly. In pipeline mode it runs headless and auto-starts your dev server on a free port. In manual mode it asks if you want to watch the browser, which is genuinely useful when debugging flaky interactions. The route mapping is opinionated but covers Rails and Next.js patterns well. Good for catch-all smoke tests before merging, though you'll want real integration tests for complex flows.