La Royal [Official Photo] Celeste, a tiny Peruvian restaurant in Somerville’s Union Square and winner of Eater Boston’s 2018 Restaurant of the Year award, no longer has an end date — and it will soon have a sibling nearby in Cambridge’s Huron Village neighborhood, too. Celeste is three years into what was supposed to be a five-year lifespan. Founders Maria Rondeau and JuanMa Calderón — an architect and filmmaker, respectively, by trade — always intended for it to have an ending, at least in its current form with themselves at the helm. “It’s good to know where the exit is,” Calderón told Eater in late 2019. “We didn’t want to feel tied to something for the rest of our lives, so we were right to say only five years, even if it’s super.”