The company’s leaders are eager to shed its old skin to create what they call the “experience of the future.” The same chain that was credited for standardizing restaurant operations in its early days is now offering customized burgers and table service at some locations. In-store kiosks have automated some order-taking. Breakfast recently became an all-day affair. It redesigned the boxes, bags, and cups it serves food in this month. It’s slowly transitioning to cage-free eggs. It’s even serving kale, for god’s sake.