Dick Hoyt, who died Wednesday of heart failure at 80, was a perennial presence with son Rick, completing 32 Boston Marathons between 1980 and 2014. Through bitter cold, searing heat, and windblown rain, they were an inseparable and indomitable entry, running and rolling up and down the hills, always finishing and always with the son one second ahead of the father, as Rick enjoyed pointing out. “My favorite race,” Dick said. “My ears ring for two weeks afterward.”