Burrito lovers have had weeks to prepare for the hours-long closure of Chipotle restaurants today, and in that time several competing fast Mexican chains have promoted special offers for the lunchtime crowd. But it looks like Chipotle may also have a deal for its temporarily abandoned customers: a raincheck for a free burrito. While Chipotle, which closed today for a four-hour long meeting to discuss food safety issues and initiatives, aims to win back the confidence of its customers, some rival chains are hoping to turn the eatery’s missed lunch into revenue of their own, offering promotions timed to the closures. Freshii, which specializes in burritos, wraps, soups, and other fast-casual eats, announced weeks ago that it would offer a half-off promotion Feb.