The Strafford General Store offers Noah Kahan shirts that picture the singer’s hometown. Photo by Kevin O’Connor/VTDigger STRAFFORD — Saunter into the circa-1885 Strafford General Store and you’ll see locals beeline for such staples as donuts, duct tape and Darn Tough socks. Then comes the more circuitous buzz of visitors in search of this Upper Valley hamlet’s favorite son: 29-year-old Grammy-nominated singer-songwriter Noah Kahan. “Somebody co…