LIMA—Peru’s electoral authority on Monday named socialist Pedro Castillo as the country’s next president and winner of the June 6 runoff against right-wing candidate Keiko Fujimori, who accepted the result but said she had been cheated. The official result had been delayed after Fujimori requested that the committee responsible for declaring the winner of the June 6 presidential election review accusations of irregularities in rural voting districts in the Andean region and annul some ballots if fraud is found. The appeal triggered a constitutional crisis when key election official Luis Arce, one of the four committee members, was suspended late June for refusing to participate further in the electoral process after the committee rejected 10 appeals from Fujimori’s party—some on technical grounds as the challenges were lodged after the 8 p.m. but before midnight on the third day after polls closed. Arce was replaced by Victor Rodriguez. Fujimori, the daughter of the former anti-communist president Alberto Fujimori, …