As the sun broke through the clouds on a breezy Monday morning, first-year students and their families gathered on Kresge Oval for MIT’s Convocation, the Institute’s annual welcome to the incoming class. The ceremony marked one of the first major events MIT has hosted on campus since the start of the Covid-19 pandemic. And while some aspects of the occasion were shaped by the ongoing pandemic — notably, masks were required of all who attended — the message to the 1,184 members of MIT’s Class of 2025 was one of…