[FEATURE] Expose Claude Max plan usage quota in statusline JSON

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

When using Claude Code with a Claude Max subscription, I have no way to monitor my plan's usage quota from within the terminal. The statusline feature allows customizing the status bar with session data, but the JSON schema provided to statusline commands only exposes context window percentage and session-level information — it does not include account-level Max plan consumption (e.g., messages or tokens used vs. the current billing period limit).

Proposed Solution

Add a usage quota field to the statusline JSON payload, e.g.:

"account": {
"plan": "max",
"usage_percentage": 42.5,
"usage_reset_at": "2026-06-01"
}

This would allow users to build status bar indicators (progress bars, color gradients, percentage labels) that surface Max plan consumption directly in the terminal alongside existing context window and model information.

Alternative Solutions

_No response_

Priority

Critical - Blocking my work

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_