Manchester firefighters searched for a woman who died in a house fire, but their efforts were hindered because both entrances were blocked by garbage. Fire Chief James Burkush described it as ‘‘what we call hoarding, a pack rat, everything,’’ WMUR-TV reported. Fire crews were called to the home shortly before 5 p.m. Tuesday. Investigators believe the fire was caused by an overloaded extension cord on the second floor. That is where they found the woman. Her name has not been released.