Allow showing API costs and git worktree in the status line

What variant of Codex are you using?

CLI

What feature would you like to see?

I'd like to include API costs and git worktree names in my status line, as supported by Claude Code.

Additional information

https://github.com/openai/codex/issues/2926 was the original request for the status line feature (done).
https://github.com/openai/codex/issues/9756 requested API costs but was closed as a duplicate.