/usage-credits blocked after quota reset: stale request state persists across periods

Description

After a quota period resets, the /usage-credits command still returns:

You've already sent a usage credit request to your admin.

This prevents users from requesting additional credits in the new period, even though the previous request was from a prior quota cycle.

Steps to Reproduce

1. Send a /usage-credits request near the end of a quota period.
2. Wait for the quota to reset (new period begins).
3. Use up credits in the new period.
4. Run /usage-credits again — command is blocked with the stale message above.

Expected Behavior

The "already sent" state should be cleared when the quota period resets, allowing users to send a new request in the new period.

Actual Behavior

The command remains blocked indefinitely, forcing users to contact their admin out-of-band.

Environment

• Claude Code CLI
• Enterprise/team account