Feature request: Expose account usage limits via CLI / API

As a Pro subscriber, I'd like to be able to programmatically query my current usage against plan limits (5-hour window remaining, weekly usage remaining + days until reset).

Use case: Display live quota status in the Claude Code status line footer, or in custom tooling/dashboards.

Proposed options (either would work):

• claude usage CLI subcommand that outputs current quota state (JSON flag preferred)
• REST endpoint GET /v1/account/usage returning window/weekly quota consumed + reset timestamps

Currently, this data is only visible on the claude.ai web dashboard and is not accessible programmatically without scraping.