Azure AI Foundry gpt-4o-transcribe-diarize (2025-10-15): active → retiring

Azure AI Foundry gpt-4o-transcribe-diarize (2025-10-15) (azure/gpt-4o-transcribe-diarize-2025-10-15) is now retiring, previously active. Scheduled retirement: 2027-04-15. Verified against the provider's own published schedule.