mweinbach/open-grok ? reverse-engineered prompt

Build me a terminal app called open grok that helps me code with AI from the command line.

It should feel like a polished chat style terminal assistant where I can sign in with xAI or ChatGPT Codex, start a session, ask for help on my code, and switch models without losing the conversation. I want it to support running tools on my files, editing code, and doing longer coding tasks in the background. It should also show usage, handle updates automatically, and keep the installed binary managed safely. If the provider supports search, use the right search tool for that provider, and keep credentials separate so nothing leaks between accounts.

Please make the experience work well in a TUI, with sensible defaults, a clean settings flow, and a good first run experience. If you need current docs or API details, look them up online and follow the latest guidance.