EV giant Tesla Inc. has added a quirky, angular, limited edition Cyber Hammer inspired by its Cybertruck to its referral program. What Happened: Those with 35,000 referral credits can spend it on the hammer, which the company intends to make only 800 units. The hammerhead resembles the angular structure of the Cybertruck and features a laser etching of Tesla’s senior executive Franz von Holzhausen‘s signature. Holzhausen led the design for the stainless steel pickup truck. “Earned. Not given,” Tesla wrote about the hammer. The senior design executive teased the hammer last week in a picture he…