your list of edibles is pretty limited - the only one that comes to mind is sweet woodruff, which is used to flavor may wine.

other than that - you're talking prime turf for lily of the valley, there...too bad you can't expand that directive to include plants that can be used on the body as well as in it.

Also, don't laugh, but I grow stinging nettles, they prefer shade, but yes, they sting. They are VERY nutritious, look them up. I make soups in the spring/summer out of them (cold soup with egg and sorrel for example).

O, and french sorrel could work for you too, I have it in a shady spot, it doesn't like full sun in my yard. Sorrel grows very juicy leaves in the shade of my house, starting before the snow melts all the way until frost.