feat(simulation): smuggler inventory — CarriedBy, Take/Place verbs (#424)

Implement physical inventory system per D-065:

- CarriedBy(StableId) component marks items as carried by an entity
- ItemName and InventorySlot components for display and slot assignment
- Take verb: removes TilePosition, adds CarriedBy + InventorySlot
- Place verb: removes CarriedBy + InventorySlot, adds TilePosition
- Observer snapshot populates player_inventory from carried items query
- Info boundary: carried items lack TilePosition, naturally excluded
  from all spatial queries (visibility, interactions) for other entities
- 9-slot capacity (3x3 grid per OQ-24), auto-assigns first free slot
- 8 new tests covering take, place, sequential slots, full rejection

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/simulation/mod.rs

@@ -6,6 +6,7 @@ use bevy_ecs::schedule::IntoScheduleConfigs;
 
 pub mod input;
 pub mod interaction;
+pub mod inventory;
 pub mod monologue;
 pub mod movement;
 pub mod path_follow;