PHILADELPHIA — A Lancaster County man who was sentenced in secret for his role in the Jan. 6, 2021, attack on the U.S. Capitol provided information to authorities in exchange for a shorter prison term, court documents unsealed this week reveal. Samuel Lazar, 38, was charged in July 2021 for assaulting a police officer, obstructing law enforcement, and entering a restricted building after a trove of photos and images posted to social media helped prosecutors identify the Ephrata man as a participant in the violent mob. Dressed in camouflage tactical gear, ski goggles and face paint, Lazar douse…