A 54-year-old man with a 12-year history of type 2 diabetes mellitus presents with persistent microalbuminuria (albumin-to-creatinine ratio 95 mg/g) and an estimated GFR of 58 mL/min/1.73 m??. His blood pressure is 148/92 mmHg despite lifestyle measures. Which of the following first-line pharmacological interventions provides the most appropriate renal and cardiovascular protection at this stage?