While the A’s assemble for their first workout Wednesday, their one-time top starter is forging a new path for himself. At just 29, Jarrod Parker is officially retiring from the game he fought so hard to stay in after two hideous elbow injuries. He told The Chronicle this week that all that remains is the paperwork. “I’m not entertaining any offers, let’s put it that way,” Parker said with a laugh. “I’m just working through the logistical stuff.” Parker is nearly two years removed from his second surgery for a fractured medial epichondyle bone in his right elbow. He has recovered well, fully healthy except for what Parker describes as a “gnarly scar,” unsurprising after two Tommy John surgeries and two surgeries for broken elbows.