docs: document food storage transaction loop

docs/PROJECT_CONTEXT.md

@@ -468,6 +468,7 @@ NpcVisual navigates through the active world
 │   ├── action_system_boundaries_test.gd
 │   ├── deterministic_simulation_test.gd
 │   ├── flat_map_baseline_test.gd
+│   ├── food_storage_loop_test.gd
 │   ├── jajce_world_scaffold_test.gd
 │   ├── npc_visual_lifecycle_test.gd
 │   ├── resource_node_player_parity_test.gd
@@ -511,7 +512,8 @@ These are expected prototype constraints, not necessarily isolated bugs:
   continuation checks, player-parity/resource-contention, flat-map, and Jajce
   scaffold scenarios; broader gameplay coverage is still missing.
 - Resources are global floating-point counters rather than items in locations
-  and inventories.
+  and inventories, except food, which now moves through sources, NPC inventory,
+  and the village pantry.
 - NPCs do not have homes, schedules, possessions, memories, relationships,
   goals, or social knowledge.
 - NPC reasoning is logged but not presented through an in-game inspector.
@@ -735,10 +737,11 @@ architecture gate are complete:
 - authoritative active position and persisted travel destinations;
 - checksum-invariant NPC visual unload/reload with reservation preservation.
 
-The next systems milestone is a complete location-based food loop: storage,
-inventory, carrying, depositing, withdrawing, and eating through transactions.
-Bounded Terrain3D look-development can resume, but runtime terrain integration
-should remain coordinated with that visible systems slice.
+The location-based food loop is now complete at simulation level: gathering
+creates carried food, depositing fills the pantry, withdrawal retrieves one
+unit, and eating consumes it. The next systems milestone is structured
+transaction events and visible carrying/readability. Bounded Terrain3D
+look-development can resume alongside that presentation work.
 
 The coherent visual slice can then aim for: