A 22-year-old Inuk man from Nunavut is seen in a TB clinic after being identified as a close household contact of a smear-positive pulmonary tuberculosis case. He received BCG in infancy, is asymptomatic, and has a normal chest radiograph. His interferon-gamma release assay is positive. According to the 8th edition of the Canadian Tuberculosis Standards, which treatment regimen is preferred for his latent TB infection, assuming no contraindications?