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First, I want to commend you for having your coop finished before chickens.
Since you want to landscape it, I think some various sized shrubs, hardy ground covers to give chickens something to forage and a few fast growing trees. Chickens need shade and places to hide when hawks are about.
I wouldn't confine yourself to HD for plants. Go with natives that will better survive the hardship of living with birds that compact the soil, tend to eat anything green and scratch holes in the ground.
Look at viburnums (which should be at HD) - varieties like arrowwood, blackhaw and nannyberry. Eastern Ninebark and Downy Serviceberry are fast growing and hardy as well. Look at places that carry native plants. Those are all very plants.
For ground cover, I'd go with tender forbs rather than grass. They are less fibrous and more nutritious. Clovers, alfalfa, beets, radish, forage type turnips like 7-top, buckwheat in summer, field peas in winter.