[action] OpenAI phases out self-serve fine-tuning

OpenAI is winding down the self-serve fine-tuning platform in stages: from May 7, 2026 organizations that never ran fine-tuning cannot start; from July 2, 2026 job creation requires recent fine-tuned inference; from January 6, 2027 even active customers cannot create new jobs. Inference on existing fine-tuned models continues until each underlying base model is deprecated. Effective: 2027-01-06. Severity: action_required. Verification: verified.