Add persistent status bar to Codex CLI terminal UI

[crojac]

I’d like the Codex CLI to show a small persistent status area in the terminal chrome/status line so I don’t need to run /status to understand the
session state.

Useful fields:

• context window usage as a bar or percentage
• current working directory
• whether tools are running
• current activity state: thinking, running command, waiting for approval, idle
• git dirty indicator
• optional elapsed turn time or active task summary

Example:
Codex | ctx 42% | cwd <dir_name> | git dirty | running: <script_x>
Or compact:
[ctx █████░░░░░ 42%] [cwd <dir_name>] [tools 1] [git dirty]

/status could remain as the detailed view, but the most important operational state should be visible continuously. If it could be compact and configurable that would be great.