For more than three decades, Sarah Ferrier has stood at the crosswalk outside Saseenos Elementary, helping children safely make their way to and from school. Now, after 33 years as a crossing guard, the 64-year-old is preparing to retire at the end of June, closing a chapter that has connected her to generations of Sooke families. “It’s bittersweet,” Ferrier said. “I’ll miss the kids and the staff, but with the traffic and everything changing, i…