Lyft finally seems primed for a recovery. After years of underperformance, Lyft (LYFT 0.86%) stock may finally be ready for a comeback. The No. 2 ride-sharing company in the U.S. just posted its first-ever generally accepted accounting principles (GAAP) profit as a detente with rival Uber has benefited both companies. Lyft has improved its service and tapped into new revenue streams like advertising. Billionaire hedge fund managers seem to be taking notice. Two prominent ones -- David Tepper and Ken Griffin ...