Unable to carry his Antioch Police Department-issued badge or gun after being named in a sprawling racist texting scandal, Officer Thomas Lenderman has found another way to put those sidelined policing skills to work. He’s testifying as Santa Clara County prosecutors’ hand-picked gang expert in a case against members of the Hells Angels Motorcycle Club and the group’s alleged ties to two brutal beatings during a Chris Stapleton concert last year at Mountain View’s Shoreline Amphitheater. All of