PHOENIX — They have startled the residents of Ahwatukee, a bedroom community in southern Phoenix. They have tramped on lawns and damaged vehicles in Rio Rancho, a neighborhood of tract homes outside Albuquerque. A Border Patrol agent lost his life crashing into one of them near the Mexican border in Texas. Free-range cattle roam widely across the West, protected by centuries-old laws that give them the right of way while grazing and force landowners to fence them out. But as urban sprawl has extended into what used to be seemingly endless pasture land, cow-friendly open range laws are