A 39-year-old previously healthy man presents with fever 38.5 °C, productive cough, pleuritic chest pain, and focal right lower lobe crackles. Oxygen saturation is 95 percent on room air, blood pressure 124/78 mm Hg, and CURB-65 score is 0. He has no comorbidities or recent antibiotic use. According to Canadian guidance, which outpatient antibiotic regimen is most appropriate for his community-acquired pneumonia?