[Feature Request] Add rate limit fields to status line JSON output

Question

**Bug Description**
Title: Add rate_limit info to status line JSON

Body:
  Currently the status line JSON provides model, workspace, context_window, and cost data - but no information about plan usage limits.

It would be helpful to include rate_limit fields:
  - requests_limit
  - requests_remaining
  - requests_reset

**Environment Info**
- Platform: darwin
- Terminal: iTerm.app
- Version: 2.1.2
- Feedback ID: 1cd0d392-94c8-438c-ac92-bfab11141744

**Errors**
```json
[]
```