A 52-year-old woman is newly diagnosed with type 2 diabetes after fasting plasma glucose 8.0 mmol/L on two occasions and HbA1c 7.5% (58 mmol/mol). She has no symptoms or microvascular complications. After 3 months of documented lifestyle modification, her HbA1c remains 7.6%. According to Australian primary care guidance, what is the most appropriate next step in glycaemic management?