PRU Quota Wiped Out, very likely related to enabling Assisted Permissions

Describe the bug

I believe the issue is very likely related to enabling assisted permissions, since there were no problems before it was turned on.

• Subscription: Copilot Pro (Annual Plan / Legacy Request-based PRU).
• August 11 Incident: With 234 PRUs remaining in my allowance, I sent 1 single prompt, and my remaining quota was instantly wiped out to 0.
• September 2 Incident (Today): My quota reset today for the new billing cycle. I sent 1 single prompt in a brand-new session, and my entire September PRU allowance was instantly wiped out to 0 again.
• Historical Context: Prior to August 11, I had used this annual plan for over 16 months without any issue. This is a newly introduced recurring bug, not a normal usage behavior.

The request consumption shown in Copilot CLI is correct, but the actual backend consumption is wrong.

Affected version

No response

Steps to reproduce the behavior

1. Legacy Request-based PRU Account
2. Switch to Assisted Permissions
3. Send Prompt

Since a single prompt wiped out my entire monthly quota, I’m unable to repeat the test.

Expected behavior

No response

Additional context

Github Support Ticket #4720186

まず、issue に記載されている assisted-permissions パスと quota-consumption の報告から始め、1 回の prompt 後に CLI に表示される request の消費量と backend の allowance を比較します。対象となるソースファイルやテストは特定されておらず、quota が枯渇しているため現在は再現できません。また、期待される動作も明示されていないため、完了条件については maintainer に確認する必要があります。