Saturday morning in Golden sounds like magpies in the alley and a mower running two houses down. Hammer Home and Yard Care supplies that second sound — mowing, trimming, edging and the cleanups that bracket either end of the year. Small yards reward exactness: a straight line at the driveway, no scalped corner by the gate, the sidewalk blown off before anybody walks it. The mountains stand at the end of every street here, so a yard is framed whether it means to be or not. Golden, Wheat Ridge, Arvada and Applewood.