ConAgra Foods Inc. has agreed to add two members to its board of directors as part of an agreement with Jana Partners LLC, which has been pushing for change citing the company's ailing private-label business. Bradley A. Alford, the former chief of Nestle USA, and Timothy R. McLevish, former chief financial officer of Walgreens Boots Alliance Inc. ConAgra had previously agreed to sell the private-label business, less than three years after paying $5 billion for it.