SAN DIEGO, Calif. — Matt Arnold is a stress eater. On Wednesday night at Petco Park, tortilla chips were the guilty pleasure for the Brewers' president of baseball operations. But by the eighth inning of the game that would send his team through to the National League Championship Series for the second straight season, the architect of an overlooked and undervalued Milwaukee roster was also overachieving in his own way. He had mustered the willpower to switch to a healthier option when Padres third baseman Manny Machado launched a baseball 406 feet into the night sky and sent 47,712 fans into...