CHICAGO — Amid a lack of clarity over whether the gunfire detection devices known as ShotSpotter will stay on in Chicago beyond this week, Mayor Brandon Johnson on Thursday said he has “been clear” he expects the technology to continue operating in the city through September. However, Johnson repeatedly refused to answer whether the company’s operators had agreed to the contract extension apparently needed to keep the police tool running. Johnson announced Tuesday he would end the city’s use of the police surveillance tool after extending the city’s contract to use the technology through Septe…