SAN FRANCISCO — A few days before the start of camp, the Giants officially announced what is just about an entirely new coaching staff. Tony Vitello’s group will include a new hitting coach — Hunter Mense — and pitching coach — Justin Meccage — and nine new names to the big league staff overall. The 2026 base coaches will be Shane Robinson (first base) and Hector Borg (third base), both of whom worked with Giants minor leaguers last season.The other newcomers are Ron Washington (infield), Frank Anderson (director of Major League pitching), Christian Wonders (assistant pitching coach) and Jesse Chavez (bullpen). The holdovers from Bob Melvin’s staff are longtime Giants coach Taira Uematsu (quality control), Oscar Bernard (assistant hitting coach), Eliezer Zambrano (bullpen catcher) and Alex Burg, who earned a promotion and now will be a field coordinator in addition to coaching the catchers. Mense was with Toronto last season, working with a Blue Jays lineup that had the highest batting average in the big leagues and was second-to-last in...