Todd Spangler NY Digital EditorTwitter disclosed a binding agreement to settle a class-action lawsuit, under which the social network will pay $809.5 million to resolve claims it provided misleading user-engagement info to investors.The original lawsuit, filed in 2016 by a Twitter shareholder, alleged Dorsey and others including former CEO Dick Costolo and board member Evan Williams hid facts about Twitter’s slowing user growth while they sold their personal stock holdings “for hundreds of