Feature request: Show remaining token quota and reset time in CLI

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

Problem

There's currently no way to check your remaining token quota or when it resets from within Claude Code.
The only way to discover you've hit the rate limit is to start a session and get blocked.

## Why it matters
Users on time-based quota plans (e.g. 5-hour reset) have no way to decide whether
it's worth starting a new session or whether they should wait for the quota to reset.
This leads to wasted time starting sessions that immediately fail.

Proposed Solution

## Requested feature
Add a command (e.g. /quota, /usage, or include in /status) that shows:

• Tokens used / remaining in the current quota window
• Time until quota resets

Alternative Solutions

_No response_

Priority

High - Significant impact on productivity

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_