The Daily Beast/Marin County SheriffFormer Slack CEO Stewart Butterfield’s teenage child has been “safely recovered” a week after being reported missing in San Francisco, the family said in a statement released Sunday. The teen was found with an adult man, who has since been arrested, according to local police.Mint Butterfield, 16, was located around 11:30 p.m. on Saturday inside a white van owned by “an adult friend,” Christopher “Kio” Dizefalo, who was also in the vehicle, according to the Mar