bug(agent-tui): Astra model missing after Codex subscription login

[thinhlpg]

Outcome

After signing in through /login with a Codex subscription, Jan Agent exposes the Astra model when it is available to the authenticated account.

Scope

• Reproduce the missing Astra model after Codex subscription login.
• Trace the login, provider state, and model-discovery/filtering path.
• Make Astra appear in the available model list after successful login.
• Preserve existing Codex model availability.

Timeline

Start on issue creation; end at the selected milestone due date.

Dependencies and Risks

The exact Astra model identifier, Jan Agent version, and reproduction platform are not yet recorded.

Acceptance Criteria

• A Codex subscription login completes successfully.
• Astra is present in the model list after that login when the account has access to it.
• Existing Codex models remain available.
• The behavior is covered by a reproducible QA scenario.

Open Questions

• What exact Astra model identifier should QA verify?
• Does the issue reproduce on macOS, Windows, Linux, or multiple platforms?
• Which Jan Agent build first shows the problem?