Codex computer use as a local MCP server

Set up Codex's computer use as an MCP server for you on my Mac:
1. If there's already an MCP server called codex-cu and it works, skip to step 3.
2. Otherwise, open the .mcp.json in the newest version folder under ~/.codex/plugins/cache/openai-bundled/unified-computer-use/ (if it's not there, search ~/.codex for a .mcp.json that contains cua_repl). Copy cua_repl's command, args and env exactly, and register it as codex-cu with claude mcp add-json --scope user. Then stop and tell me to start a new session, and I'll send this again.
3. It can only control apps I've approved in Codex. If you hit "not approved", tell me which app to approve in Codex, and don't switch to another app to get around it. Don't use browser backends like chrome or the in-app browser. Control the browser as a normal app.
4. Test: in a browser I've approved, open a new tab and load [live URL] and then [local URL, e.g. http://localhost:3000]. Take a screenshot of each and list what's different. If a URL is missing or the local server isn't running, ask me first. Don't type passwords or tokens, don't click submit, pay or send buttons, don't touch tabs I already have open, and close the tab you opened when you're done.
5. Once I confirm the differences, fix the local code and compare screenshots again.