SAN FRANCISCO — The owners of nearly half a million polluting Volkswagens in the U.S. will be given the option of selling them back to the company or getting them repaired at VW’s expense, under a deal announced by a federal judge todayU.S. District Judge Charles Breyer, who is overseeing a tangle of litigation over the VW emissions scandal, gave no details on how much car owners would be paid but said the tentative agreement between the automaker, the U.S. government and plaintiffs’ attorneys would …