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_

Es ist keine Repository-Datei, kein Test und kein Code-Einstiegspunkt angegeben. Beginne damit, die Modellliste unter Debian mit CLI 1.0.27 und einem verifizierten Pro-Konto zu reproduzieren, und verfolge anschließend, wie die CLI den Zugriff auf Claude-Modelle erkennt. Fertig ist die Aufgabe, wenn Pro-Benutzer die Modelle ohne eine Kategorie „Upgrade“ auswählen können.

Vom Indexierungsmodell aus dem Issue-Text verfasst.