Add simple container recipe

Docs/InventoryDataModel.md

@@ -145,6 +145,11 @@ awkward-object handling, and hard over-encumbrance rules for later systems.
 Those systems should build on the existing total-weight hook instead of adding a
 parallel inventory burden model.
 
+The 0.1.G `simple_container` recipe is intentionally only a craftable inventory
+item. It uses wood, fiber, and hide so the survival loop can produce a storage
+foundation now, while actual placed-container inventory, permissions, volume,
+and persistence remain later system work.
+
 ## Equipment Slot Decision
 
 Dedicated equipment slots are deferred for the 0.1.E MVP. Current MVP tools,

Docs/TechnicalDesignDocument.md

@@ -73,7 +73,10 @@ Early runtime systems should remain small and explicit:
   temperature, injury, and survival damage.
 - Inventory component/classes: item stacks, item definitions, resource intake,
   and crafting inputs/outputs.
-- Crafting component/classes: recipes, validation, output creation.
+- Crafting component/classes: recipes, validation, output creation. Current
+  primitive recipes include campfire, shelter parts, primitive shelter, basic
+  tool, bandage, and `simple_container`; the simple container is an inventory
+  craftable foundation for later placed storage and trade-container systems.
 - Interaction component/classes: player-facing use/gather/build entry points.
 - Resource actors: gatherable wood, stone, fiber, water, wildlife, and future
   natural resources.