refactor(server): apply rustfmt and clippy suggestions

Formatting pass across simulation, perception, knowledge, NPC, and
test modules. Includes two clippy fixes in monologue.rs (.values()
instead of for (_, v) pattern).

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

server/src/simulation/inventory.rs

@@ -38,12 +38,7 @@ pub struct InventorySlot(pub u8);
 /// Find the next available inventory slot for a carrier.
 /// Returns None if all 9 slots are occupied.
 pub fn find_next_slot(occupied: &[u8]) -> Option<u8> {
-    for slot in 0..MAX_INVENTORY_SLOTS {
-        if !occupied.contains(&slot) {
-            return Some(slot);
-        }
-    }
-    None
+    (0..MAX_INVENTORY_SLOTS).find(|slot| !occupied.contains(slot))
 }
 
 /// Collect inventory items for a specific carrier (by StableId).
@@ -126,8 +121,7 @@ mod tests {
         let player = world.spawn_empty().id();
         let player_sid = world.resource_mut::<EntityRegistry>().register(player);
 
-        let mut query_state =
-            world.query::<(Entity, &CarriedBy, &ItemName, &InventorySlot)>();
+        let mut query_state = world.query::<(Entity, &CarriedBy, &ItemName, &InventorySlot)>();
 
         // Can't use system params directly in tests — use world query
         // Instead, verify the logic by spawning items and checking