Piazza Pod Park in Northern Liberties is officially open. Robot Bebot looms large. Story, photos by Sharon Kozden Remember when the now infamous Philadelphia Flyers’ mascot Gritty arrived on the scene in late 2018? Gritty, he of the bugged-out eyes and shaggy orange fur recently made room for the new kid on the block-one Bebot, an imposing but welcoming robot from Burning Man that towers over the Post Brothers’ latest creative use of community space (dubbed Piazza Pod Park) in Northern Liberties. The Mod Pod. I remember that television show. Tee. At 33 feet high and weighing in at 13,000 pounds, Bebot’s jolly wave greeted the public on June 8th’s grand…