Obeya from your checkout, as an app

If you run Obeya from your own checkout, you can now install it as an app: `bun run app install` puts "Obeya (checkout)" among your applications, to start from Spotlight, Launchpad or the Dock. It runs your checkout's code and follows main by itself, as `bun start` does, so work that lands is live without reinstalling. When the app itself changes, it rebuilds and restarts on its own once the agents pause. You get what only the app does, such as the push-to-talk key that works while another app is in front.