Expose reasoning effort level in statusline JSON

Feature Request

The statusline JSON (passed to statusline.sh via stdin) doesn't currently include the active reasoning effort level. It would be useful to have this exposed so users can display it in their custom status lines.

Suggested field

{
  "reasoning_effort": "low" | "medium" | "high"  // or a numeric 0-100
}

Use case

When toggling effort via /fast or other means, there's no visual indicator in the status bar of what mode you're in. This would let users show something like:

Opus 1M  Ctx 12%  Effort: high  5h 17%  7d 8%

Thanks!

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