It’s the worst-case scenario for a mural artist: to be the victim of deadly violence while painting on public streets. But the muralists who witnessed the shooting death of Antonio Ramos say the tragic incident may have been shocking and horrific, but hasn’t deterred them from continuing to work on the third installment in the “Oakland Superheroes” series being painted under freeway overpasses in West Oakland. “Public art… is a powerful way to engage the public,” said Amana Harris, Executive Director…