An 11-year-old East Brunswick boy who fatally shot his friend last month was surrounded by guns. In the East Brunswick townhouse where the boy lived with his father and grandmother, investigators discovered a cache of 98 firearms, nearly all unsecured, authorities said. In the bedroom he shared with his father, police found four rifles and 21 handguns, five of which were loaded. Middlesex County authorities said yesterday the boy's easy access to weapons led to the June 28 shooting death of Alexander Khoudiakov, 12. The boy's father, Michael Guerriero, 46, and grandmother, Josephine Guerriero, 72, who also lives in the...