By late June the canopy over Jefferson Valley closes in, and the light on a lawn turns green-gold in the last hour before dusk. claudio landscaping and construction is often still out then, finishing a cut in the cool, the smell of grass hanging over the driveway. Mowing, trimming, edging and the seasonal cleanups are the work that keeps a northern Westchester yard looking like someone is paying attention. Around Mohegan Lake and Shrub Oak the properties run to ledge and slope, and getting an even cut on ground like that takes patience. That sharp finished border where lawn meets blacktop is the whole point.