While ordering a bag of chips or a bottle of water in the morning before class, Summit High School teachers and staff might be greeted by a computerized message from Garrett Shenk’s communication aid. “Good morning. Happy Monday!” the device announced while Shenk beamed from behind it. “He’s our greeter,” said Kristin Myers, a teacher for students with disabilities and a transition coordinator at Summit High. “Sometimes it’s a more elaborate me…