A 42-year-old otherwise healthy man presents to his family physician with fever, productive cough, and pleuritic chest pain for 3 days. He is febrile at 38.4 °C, respiratory rate 20 breaths/min, oxygen saturation 96 percent on room air, and blood pressure 120/72 mm Hg. Chest examination reveals focal crackles; he is managed as an outpatient with presumed community-acquired pneumonia. According to Canadian CAP guidance, which empirical oral antibiotic regimen is most appropriate in this low-risk patient with no comorbidities?