docs: add current developer feature index

docs/FOOD_STORAGE_ARCHITECTURE.md

@@ -72,11 +72,14 @@ the unit never consults pantry stock again before delivery.
 
 ## Deliberate limits
 
-The current bounded economy has one authored pantry and one woodpile with
-simple food/wood stacks. It does not yet add:
+The current playable economy still has one authored village pantry and one
+woodpile, but it now also has typed item definitions, an apothecary route,
+persisted player inventory, and definition-backed activity costs. It does not
+yet add:
 
-- player inventory;
-- storage reservations or access capacity;
+- regional storage/market ledgers;
+- storage reservations or ownership/access policy beyond authored capability
+  routing;
 - multiple households or ownership;
 - spoilage, item quality, weight, or stack definitions.