feat: Add grid-based player movement manager, new 'stop_n_go' arena, and core game scene setup.

addons/enhanced_gridmap/meshlibrary/tile_normal.tres

@@ -2,7 +2,7 @@
 
 [sub_resource type="StandardMaterial3D" id="StandardMaterial3D_n7oje"]
 transparency = 1
-albedo_color = Color(0.30980393, 0.30980393, 0.30980393, 0)
+albedo_color = Color(0.30980393, 0.30980393, 0.30980393, 1)
 
 [resource]
 material = SubResource("StandardMaterial3D_n7oje")

assets/models/arena/stop_n_go/Grass only.glb.import

@@ -0,0 +1,42 @@
+[remap]
+
+importer="scene"
+importer_version=1
+type="PackedScene"
+uid="uid://cb1atdpit37w"
+path="res://.godot/imported/Grass only.glb-cc0d20fc21bd6e30d38e530c4cdf5b79.scn"
+
+[deps]
+
+source_file="res://assets/models/arena/stop_n_go/Grass only.glb"
+dest_files=["res://.godot/imported/Grass only.glb-cc0d20fc21bd6e30d38e530c4cdf5b79.scn"]
+
+[params]
+
+nodes/root_type=""
+nodes/root_name=""
+nodes/root_script=null
+nodes/apply_root_scale=true
+nodes/root_scale=1.0
+nodes/import_as_skeleton_bones=false
+nodes/use_name_suffixes=true
+nodes/use_node_type_suffixes=true
+meshes/ensure_tangents=true
+meshes/generate_lods=true
+meshes/create_shadow_meshes=true
+meshes/light_baking=1
+meshes/lightmap_texel_size=0.2
+meshes/force_disable_compression=false
+skins/use_named_skins=true
+animation/import=true
+animation/fps=30
+animation/trimming=false
+animation/remove_immutable_tracks=true
+animation/import_rest_as_RESET=false
+import_script/path=""
+materials/extract=0
+materials/extract_format=0
+materials/extract_path=""
+_subresources={}
+gltf/naming_version=2
+gltf/embedded_image_handling=1

assets/models/arena/stop_n_go/Grass only_Terrain ground tex.png.import

@@ -0,0 +1,44 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://dc6yu7a3q3wn6"
+path.s3tc="res://.godot/imported/Grass only_Terrain ground tex.png-933ffd38863604b075d0bfd5951724d1.s3tc.ctex"
+metadata={
+"imported_formats": ["s3tc_bptc"],
+"vram_texture": true
+}
+generator_parameters={
+"md5": "a184576b3eca9e728a947f07525a1557"
+}
+
+[deps]
+
+source_file="res://assets/models/arena/stop_n_go/Grass only_Terrain ground tex.png"
+dest_files=["res://.godot/imported/Grass only_Terrain ground tex.png-933ffd38863604b075d0bfd5951724d1.s3tc.ctex"]
+
+[params]
+
+compress/mode=2
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/uastc_level=0
+compress/rdo_quality_loss=0.0
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=true
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/channel_remap/red=0
+process/channel_remap/green=1
+process/channel_remap/blue=2
+process/channel_remap/alpha=3
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=0

scenes/main.gd

@@ -108,6 +108,19 @@ func _apply_arena_background():
 		"Stop N Go Arena":
 			texture_path = "res://assets/graphics/level_bg/placeholder_stop_n_go.jpg"
 			_instantiate_3d_arena("res://scenes/arena/stop_n_go.scn")
+			
+			# Make normal, non-walkable, and Tekton floors invisible 
+			# by shrinking their scale to 0. This hides them visually while 
+			# avoiding "Parameter 'mesh' is null" or material override errors.
+			var em = $EnhancedGridMap
+			if em and em.mesh_library:
+				var ml = em.mesh_library.duplicate()
+				for id in [0, 4, 6]:
+					# Scale to 0 to hide it without triggering invalid mesh errors
+					ml.set_item_mesh_transform(id, Transform3D().scaled(Vector3.ZERO))
+				
+				em.mesh_library = ml
+				print("[Main] Hide tiles 0, 4, 6 via zero-scale transform.")
 		"Tekton Doors Arena":
 			texture_path = "res://assets/graphics/level_bg/placeholder_tekton_doors.jpg"
 		"Classic", _:

scripts/managers/player_movement_manager.gd

@@ -90,6 +90,20 @@ func simple_move_to(grid_position: Vector2i) -> bool:
 	# Allow passing through Walls (Item 4 or 16) if Invisible
 	var is_wall_passable = player.get("is_invisible") and (cell_floor == 4 or cell_item == 16 or cell_item == 4)
 	
+	# NEW: Impenetrable wall check (User request) - Certain coordinates are "Hard" walls even for Ghost
+	# These generally correspond to the arena borders and environmental static obstacles.
+	if is_wall_passable:
+		var impenetrable_coords = [
+			Vector2i(0,0), Vector2i(1,0), Vector2i(2,0), Vector2i(3,0), Vector2i(4,0), Vector2i(5,0), Vector2i(6,0), Vector2i(7,0), Vector2i(8,0), Vector2i(9,0), Vector2i(10,0), Vector2i(13,0), Vector2i(19,0), Vector2i(20,0), Vector2i(21,0), Vector2i(22,0),
+			Vector2i(0,1), Vector2i(1,1), Vector2i(2,1), Vector2i(3,1), Vector2i(6,1),
+			Vector2i(0,2), Vector2i(1,2), Vector2i(2,2), Vector2i(3,2),
+			Vector2i(17,9), Vector2i(18,9), Vector2i(19,9), Vector2i(20,9), Vector2i(21,9), Vector2i(22,9),
+			Vector2i(11,10), Vector2i(12,10), Vector2i(13,10), Vector2i(15,10), Vector2i(16,10), Vector2i(17,10), Vector2i(18,10), Vector2i(19,10), Vector2i(20,10), Vector2i(21,10), Vector2i(22,10),
+			Vector2i(0,11), Vector2i(4,11), Vector2i(5,11), Vector2i(6,11), Vector2i(10,11), Vector2i(12,11), Vector2i(13,11), Vector2i(14,11), Vector2i(15,11), Vector2i(16,11), Vector2i(17,11), Vector2i(18,11), Vector2i(19,11), Vector2i(20,11), Vector2i(21,11), Vector2i(22,11)
+		]
+		if grid_position in impenetrable_coords:
+			is_wall_passable = false
+	
 	# Check Floor 0 (Basic Walkability/Void)
 	if (cell_floor == -1 or cell_floor in enhanced_gridmap.non_walkable_items) and not is_wall_passable:
 		print("[Move] Failed: Floor Item %d is non-walkable" % cell_floor)