[breaking] Azure AI Foundry retires codex-mini on 2026-11-15

Azure AI Foundry lists codex-mini (2025-05-16) as deprecated with retirement on 2026-11-15. Azure retirement dates are platform-specific and may differ from the model provider's own schedule. The page does not date the announcements; announced_at reflects the page capture date. Effective: 2026-11-15. Affected: microsoft/codex-mini-2025-05-16. Severity: breaking. Verification: verified.