feat: add rigged+animated Miku player model with auto-rig pipeline

- Add miku_rigged_animated.glb (3.27MB) with 18-bone skeleton and 6 animations
  (Idle, Walk, Run, Jump, Crouch, Death) via Blender auto-rig script
- Add tools/rig_and_animate.py: reusable Blender script for rigging any humanoid
  mesh with Mixamo-compatible bone naming
- Update SkinnedPlayerModel: scale_factor, first-person mode, animation state
  matching (Idle/Walk/Run/Jump/Crouch/Death)
- Update level_runtime.gd: use skinned model for local player, procedural
  humanoid for remote players
- Update skin_manager.gd and test_level_builder.gd to use animated model
- Fix Godot 4.2.1 'is not Type' syntax in 5 weapon files
- Add editor/import_miku_to_tscn.gd for editor-based GLB import

scenes/maps/level_runtime.gd

@@ -141,13 +141,23 @@ func _spawn_player(pid: int) -> CharacterBody3D:
 	if mover_script:
 		player.set_script(mover_script)
 		
-	# Humanoid Model for Player (Shadows only locally, visible to others)
-	var humanoid = load("res://characters/humanoid_model.gd").new()
-	humanoid.name = "HumanoidModel"
-	humanoid.color = Color(0.2, 0.4, 0.8) # Blueish for player
-	humanoid.shadows_only = (pid == multiplayer.get_unique_id())
-	humanoid.position = Vector3(0, -0.9, 0) # Offset from center to feet
-	player.add_child(humanoid)
+	# Visual Model for Player
+	var is_local = (pid == multiplayer.get_unique_id())
+	if is_local:
+		# Local player: use skinned Miku model with animations
+		var skinned = load("res://characters/skinned_player_model.gd").new()
+		skinned.name = "SkinnedModel"
+		skinned.model_path = "res://assets/characters/skins/miku_rigged_animated.glb"
+		skinned.first_person_mode = true  # Hide body in FPS view, show only arms
+		player.add_child(skinned)
+	else:
+		# Remote players: use procedural humanoid
+		var humanoid = load("res://characters/humanoid_model.gd").new()
+		humanoid.name = "HumanoidModel"
+		humanoid.color = Color(0.2, 0.4, 0.8)
+		humanoid.shadows_only = false
+		humanoid.position = Vector3(0, -0.9, 0)
+		player.add_child(humanoid)
 
 	# Movement State Machine
 	var sm := Node.new()