A 54-year-old man with type 2 diabetes managed with metformin and lifestyle changes has a haemoglobin A1c of 8.7% despite adherence. He has a history of myocardial infarction 3 years ago and estimated GFR of 70 mL/min/1.73 m². According to current diabetes recommendations prioritising cardiovascular benefit, which additional glucose-lowering medication is most appropriate?