LAS VEGAS — The day before the Carolina Hurricanes reached the NHL’s summit, their coach reflected on the climb. After years of progress and setbacks, growth and stagnation, minor tweaks and wholesale changes, Carolina’s moment arrived on Sunday at T-Mobile Arena. Coach Rod Brind’Amour’s team is a champion now, in the realest, fullest sense of the term, beating the Vegas Golden Knights 3-0 in Game 6 of the Stanley Cup Final to finish off a dominant 16-3 postseason run.