There were a few years there where it appeared Lady Gaga’s career was headed for a premature Caesars Palace residency. [...] the singer-songwriter, whose greatest talent appears to be reinvention, is back on top with the release of her most recent album, 2016’s “Joanne,” which debuted at No. 1 on the Billboard 200, and her spectacular Super Bowl halftime show earlier this year. On her current tour, Lady Gaga is back in arenas and stadiums — including two Northern California dates at AT&T Park in San Francisco on Sunday, Aug.