[breaking] Azure AI Foundry retires o3-mini on 2026-08-02

Azure AI Foundry lists o3-mini (2025-01-31) as deprecated with retirement on 2026-08-02; suggested replacement: o4-mini. 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: 2026-08-02. Migration target: microsoft/o4-mini. Affected: microsoft/o3-mini-2025-01-31. Severity: breaking. Verification: verified.