ConAgra Foods agreed Wednesday to pay $11.2 million, a sum that includes the highest criminal fine ever in a U.S. food safety case, to settle a federal charge that the company shipped Peter Pan peanut butter tainted with salmonella from a plant in Georgia, sickening more than 600 people and triggering a massive recall eight years ago. Federal prosecutors filed a single misdemeanor charge of shipping adulterated food against the Omaha, Nebraska, based company along with a plea deal Wednesday in U.S. District Court in Georgia.