Before the tractors showed up, Raimondi Park didn't look like the future home of a professional baseball team. Sitting in the shadow of Interstate 880, the long-standing West Oakland field felt forgotten. Almost every patch of grass was overgrown and the infield dirt had long since been blanketed with a thin layer of sod in a lighter shade of green. The pitcher’s mound, not much more than a bump, had become the territory of large Canadian geese that were seemingly unbothered by the intended use of their perch. Besides the din of hundreds of cars and trucks on their way to more important places, the park was quiet. On its surface, Raimondi was beleaguered. But a new day is coming. Weeks ago, work trucks and heavy equipment rolled into the park, chased away the geese, and began tearing up the turf. By the left field foul pole, laminated signs posted by Oakland’s Planing Bureau inform passersby of imminent improvements to the facilities, …