Robots have rolled into retail, from six-foot-tall free-moving machines spotting spills in Giant Foods Stores to autonomous shelf-scanners checking inventory in Walmart. At Lowe’s, the home improvement chain, a “LoweBot” in some stores can answer simple questions, such as where to find items, and can assist with inventory monitoring. These robots free up workers from routine tasks, presumably giving humans more time for customer interaction — but that’s only the beginning.