Appropriate for the day that the much hyped game BioShock hits the shelves is a Hiawatha Bray piece on Boston's video game companies. Bioshock (I gots me one!), made by Quincy-based 2K Boston (formerly Irrational Games) and Cambridge's Harmonix with forthcoming Rock Band are in the spotlight. Still, the Bay State only has 4.4% of the game design workforce, according to a cited survey.