Pro users restricted from Claude models on CLI (v1.0.27 / Debian)

### Describe the bug

### Description:

I am a GitHub Copilot Pro subscriber (annual billing). Despite my plan including access to premium models, I am currently unable to select Claude 4.6 (or earlier Claude versions) in the Copilot CLI. The interface lists these models under an "Upgrade" category, effectively locking me out of features I have already paid for.

### Environment:

- OS: Linux Debian
- CLI Version: 1.0.27
- Subscription Tier: Pro

### Steps Taken:

- Completed the CLI authentication process multiple times.
- Verified active Pro subscription status on my GitHub account.
- This issue has persisted for over two months, despite multiple attempts to re-login within the CLI.

### Expected Behavior:

Claude models should be available and selectable for all Pro subscribers without an "Upgrade" category.

### Actual Behavior:

The CLI fails to recognize my Pro entitlement for Claude models. There are no error messages; the models are simply treated as locked content. This appears to be a systemic sync issue affecting early annual subscribers.

### Screenshots:

### Affected version

_No response_

### Steps to reproduce the behavior

_No response_

### Expected behavior

_No response_

### Additional context

_No response_

No repository file, test, or code entry point is identified. Start by reproducing the model list on Debian with CLI 1.0.27 using a verified Pro account, then trace how the CLI recognizes access to Claude models. Done means Pro users can select the models without an "Upgrade" category.

Scritto dal modello di indicizzazione a partire dal testo della issue.