It may not look like a hole lot is going on in there in this photo taken a few months ago, but the 2,492-sq.-ft. 1940-vintage retail building at the southeast corner of White Oak Dr. and Oxford St. in the Heights — a crooked saunter across the street from Onion Creek Coffee House and a lot and a street down from the Heights hike-and-bike trail (and this) — will be filled with bagels this summer, promises its new proprietor. Behind its plywood poker face, the property at 3119 White Oak Dr. has been stuffed with a bagel oven, tile-front counters, and a walk-in refrigerator, according to the social media accounts of the establishment, known as Golden Bagels and Coffee. Soon to be on the menu, in addition to the comestibles promised in the shop’s name: local cured and smoked fish.