Most plants that provide edible fruit/berries/foliage simply do not thrive in much shade - by and large they need full sun or close to it. The major exceptions, especially in the PNW, would be the huckleberries - both evergreen and deciduous (Vaccinium ovatum and V. parviflora). Again, these need some decent light to flower and fruit well but they are quite shade tolerant and are common native woodland species. If you want to range a bit further afield, you could try salal (Gaultheria shallon) and Oregon grape (Mahonia aquifolium) - both of these are native woodland plants and produce berries favored by the indigenous native peoples. These berries need to be cooked before very palatable.

Any of the Fargesia species do well in shade but if in heavy shade, may not grow as quickly or as densely as they would with a bit more light. But unless your are of the panda persuasion, bamboo is unlikely to be very tasty :-) You could also try Camellia sinensis or tea plant. Camellias are very shade adapted and you can harvest the new growth to make your own tea. Again, heavy shade is going to restrict or limit growth.

Other good plants for shade that can provide privacy screen are Japanese laurel (Aucuba japonica) and Japanese aralia (Fatsia japonica). Both of these will take quite heavy shade as well.

Thank you for the suggestions and reply! The Fatsia japonica looks beautiful (I'm in love with Gunnera and that tropical looking foliage, but limited space and little light has me hand tied there). The more reading I do the more edibles seem pretty far fetched, but I'll probably try my luck with one or two of the edible species and fill in with privacy screen plants.

I remember picking deciduous huckleberries when I was younger out in the woods, though the plants were commonly on giant nurse logs and aged stumps. Would some old wood sunk into the surrounding soil be beneficial? Or maybe hollowed out sunken rounds. I'll look into the Oregon grape and salal as well, maybe they'll do well out towards the yard/plot edge where there's a couple hours of morning sunshine