fix(multiplayer): replicate per-player avatar loadout and preserve original materials

scripts/player_spawner.gd

@@ -22,6 +22,9 @@ var spawn_position: Vector3 = Vector3(0, 1.5, 0)
 ## the client can drop acked inputs and replay the rest).
 var last_applied_seq: int = 0
 
+## Replicated avatar loadout (base_body, slots, skin_tone).
+var loadout: Dictionary = {}
+
 ## Queue of {seq:int, move_x:float, move_z:float, jump:bool, look_yaw:float}
 ## appended by rpc_request_input, drained each physics frame.
 var _input_queue: Array[Dictionary] = []
@@ -76,6 +79,7 @@ func get_server_state() -> Dictionary:
 		"rotation_y": rotation.y,
 		"velocity": velocity,
 		"on_floor": is_on_floor(),
+		"loadout": loadout,
 	}
 
 
@@ -84,3 +88,10 @@ func rpc_request_input(input: Dictionary, seq: int) -> void:
 	var d := input.duplicate()
 	d["seq"] = seq
 	_input_queue.append(d)
+
+
+@rpc("any_peer", "call_remote", "reliable")
+func rpc_set_loadout(p_loadout: Dictionary) -> void:
+	var sender := multiplayer.get_remote_sender_id()
+	if sender == peer_id or sender == 1 or sender == 0:
+		loadout = p_loadout.duplicate(true)