fix(simulation): add TileKind to VisibleTile wire protocol (#412)

Server was sending visible_tiles without tile type data, so the client
could not distinguish floor from wall in live mode. Add TileKind enum
(Floor/Wall/Door/Object) to VisibleTile, populated from WalkabilityMap
in the NaturalVision perception query. Update test fixtures to include
the new field. Uses #[serde(default)] for backward compatibility.

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

server/src/perception/query.rs

@@ -9,7 +9,7 @@ use std::collections::{HashMap, HashSet};
 
 use bevy_ecs::prelude::*;
 
-use crate::bridge::types::{FacingDirection, VisibilitySector, VisibleTile};
+use crate::bridge::types::{FacingDirection, TileKind, VisibilitySector, VisibleTile};
 use crate::perception::shadowcast::compute_fov;
 use crate::perception::vision_cone::{apply_vision_cone, VisionConeConfig};
 use crate::simulation::movement::{TilePosition, WalkabilityMap};
@@ -67,11 +67,19 @@ impl PerceptionQuery for NaturalVision {
 
         let visible_tiles = cone_tiles
             .iter()
-            .map(|&(x, y, sector)| VisibleTile {
-                x,
-                y,
-                z,
-                visibility: sector,
+            .map(|&(x, y, sector)| {
+                let tile_kind = if walkability.can_move_to(&TilePosition::new(x, y, z)) {
+                    TileKind::Floor
+                } else {
+                    TileKind::Wall
+                };
+                VisibleTile {
+                    x,
+                    y,
+                    z,
+                    visibility: sector,
+                    tile_kind,
+                }
             })
             .collect();