Feature Request: Expose billing session usage in statusline JSON payload

Summary

The Claude Code UI displays a "Current session" panel with:

• Usage percentage (e.g., "85% used")
• A visual progress bar
• Reset time (e.g., "Resets 2:30pm (America/Monterrey)")

This information is not available in the JSON payload received by the statusline command script, making it impossible to display billing/quota usage directly in the terminal statusline.

Requested Change

Expose the following fields in the statusline JSON payload:

{
  "sessionUsagePercent": 85,
  "sessionResetTime": "2026-05-11T20:30:00-06:00",
  "sessionResetTimeFormatted": "2:30pm (America/Monterrey)"
}

Use Case

Power users running Claude Code in the terminal want to monitor their plan usage at a glance without switching context. Adding these fields would allow statusline scripts to show something like:

my-project |  main | Claude Sonnet 4.5 | [████████░░] 85% used | Resets 2:30pm

Current Workaround

None — the data is not accessible outside the UI.