Add MVP inventory HUD panel

Docs/InventoryDataModel.md

@@ -119,6 +119,8 @@ The 0.1.E inventory work should implement these operations on top of the model:
 - Carry capacity: continue using total weight first, with later volume or pack
   systems layered on top.
 - UI: read the replicated stack list and send requests back through server RPCs.
+  The MVP HUD now includes a compact inventory panel that shows occupied slots,
+  total carried weight, and the first visible item stacks.
 
 ## Carry Capacity Placeholder
 

Docs/TechnicalDesignDocument.md

@@ -138,6 +138,12 @@ HUD. Future backpacks, containers, awkward-object rules, and hard overload
 limits should extend this total-weight path rather than creating a second carry
 model.
 
+The MVP inventory UI is a compact `AAgrarianDebugHUD` inventory panel, enabled
+separately from the full developer HUD. It reads the replicated inventory stack
+array, shows occupied slots, total carried weight, and a short visible stack
+list, and leaves mutation actions on the existing server-authoritative commands
+and RPCs until a full UMG inventory screen is introduced.
+
 ## Time And Environment
 
 The MVP gameplay calendar target is: