Roomba inventor Colin Angle made robots useful. Now he wants to make them lovable. Familiar Machines designed its robot as an "abstract bear." Familiar Machines & Magic Roomba inventor Colin Angle's new startup is building a four-legged pet-inspired robot. Familiar Machines, which has raised $30 million in funding, plans to start selling robots next year. The company worked with Hollywood writers to shape the robot companion's personality. Colin Angle put the Roomba in millions of homes by giving it a simple job: cleaning the floor. Now, the longtime iRobot CEO wants his next home robot to do something harder to measure. His new startup, Boston-based Familiar Machines & Magic, has built a four-legged, pet-inspired robot meant to offer companionship, emotional support, and gentle nudges toward healthier routines. The company calls the robot the Familiar, a reference to the supernatural animal companions associated with witches.…