There's an hour on Livingston Avenue when the dew still holds the shape of last night's air and the mower leaves the first clean line of the day. AJ Hernandez Landscaping LLC works those New Brunswick mornings — mowing, edging, string trimming, and the cleanups that reset a yard from one chapter to the next. A city lot here is small and much-looked-at, so the border along the front walk gets cut like it matters, because it does. By midday the grass has dried pale-gold at the tips and the property looks the way its owner had pictured it. The work carries on into Highland Park, Piscataway and North Brunswick, block by block.