The Giants’ offseason work might not be finished just yet.Chairman Greg Johnson told The San Francisco Chronicle’s Ron Kroichick that the Giants remain active in their pursuit of additional roster upgrades — particularly bullpen help — as the club continues shaping its pitching staff ahead of the 2026 season.“We’re still looking,” Johnson told Kroichick. “We know you can never have enough arms in the bullpen.”San Francisco already has made several notable additions under president of baseball operations Buster Posey, who is in his second offseason leading the club’s baseball decision-making.Posey has pushed for the Giants to remain financially aggressive as he works to guide the team back to the postseason for the first time since 2021, when San Francisco won a franchise-record 107 games before falling to the rival Los Angeles Dodgers in the NL Division Series.The Giants’ payroll currently sits around $227.1 million, placing the organization among the league’s higher spenders but still trailing several big-market clubs.Johnson praised Posey’s persistence in seeking approval for roster...