Expose account-level API usage quota and reset time to status line

Feature Request

The status line currently exposes session-level data like context_window.used_percentage, but there's no way to see account-level API usage — specifically how much of your model quota (e.g. Opus) you've consumed and when it resets.

Problem

As a heavy Opus user, I'd love to see at a glance how much of my usage allowance remains and when it resets — right in the status bar. Currently the only "usage" metric available is context window consumption for the current conversation, which is useful but solves a different problem.

Proposed Solution

Add fields to the JSON blob passed to the status line script, something like:

{
  "account_usage": {
    "model": "claude-opus-4-6",
    "used_percentage": 72.5,
    "reset_at": "2025-02-15T00:00:00Z",
    "reset_in_hours": 48
  }
}

This would let users build status lines that show quota remaining and countdown to reset — e.g.:

▰▰▰▰▰▰▰▱▱▱ 72% Opus used · resets in 2d

Why This Is Useful

• Helps pace usage across a billing period
• Avoids surprise rate limits mid-session
• The status line is the perfect place for this — always visible, non-intrusive
• Currently requires leaving the terminal to check the web dashboard