For greens you run micro greens on trays takes 60-90 days many trays less space and failure resilience. Super easy and can work on fluorecent lamps for a few hours in addition to sunlight.
As for protein if you can fish they are year round. Use old methods if a collapse as no conservation officer same with hunting forget going out walking bait and kill.
You can grow scoby in kambucha to eat takes 30 days.
You can grow spiralina ( green algae) 60 days
There are food stretchers, adding cat tail pollen to flour, growing meal grubs for protein, crickets and snails.
Cooking techniques never ending stew to maximize nutrient recovery.
There are lots of things in forest to eat all year around just the great grey masses have no idea the food they walk by.