On her smartphone map, she watched the tiny dot scurrying toward her Fort Lauderdale address in real time. Then her phone buzzed with an alert: "Your food delivery robot is here!" Karla Joan Nelson-Thatcher raced downstairs to the sidewalk outside her Veneto Las Olas apartment and found, waiting near the front steps, what resembled a 3-foot-tall picnic basket on wheels with glowing Pac-Man eyes.