Luigi Mangione’s job in federal lockup is cleaning showers — and he’s a one-man welcoming committee, according to a fellow jailbird. When Michael Daddea arrived at the Brooklyn Metropolitan Detention Center in Sunset Park, a guard told him he would be housed in the same unit as the accused assassin of UnitedHealthcare CEO Brian Thompson, he revealed in a video posted to X. “I’m like, ‘Yeah, he’s being a wise ass’. . . I look out the cell, Luigi is standing there and he’s like, ‘Hey, how’s it going?’ Like, super nice. Introduced himself to me first thing. I’ve literally...