Late August on Halsted Street: the air sits heavy, the grass has slowed to a crawl, and Saturday morning is when yards finally get their due. JC GENERAL SERVICES moves through East Orange on that schedule — mowing, trimming along fence lines and meter posts, edging the walks, and bagging off whatever comes loose. Small city lots reward attention to the corners, mostly because the corners are the yard. Spring and fall cleanups handle the heavy freight: winter's litter of twigs, autumn's full drop of leaves. By noon the block sounds different, and it looks it too.