feat: Implement Tekton roaming NPC with movement, combat, carry, throw, and knock mechanics.

scripts/tekton.gd

@@ -106,9 +106,12 @@ func move_to(target_pos: Vector2i):
 		emit_signal("movement_finished")
 	)
 	
-	if is_multiplayer_authority():
+	if is_multiplayer_authority() and can_rpc():
 		rpc("sync_movement", target_pos)
 
+func can_rpc() -> bool:
+	return multiplayer.has_multiplayer_peer() and multiplayer.multiplayer_peer.get_connection_status() == MultiplayerPeer.CONNECTION_CONNECTED
+
 @rpc("any_peer", "call_remote", "reliable")
 func sync_movement(target_pos: Vector2i):
 	move_to(target_pos)
@@ -388,7 +391,7 @@ func spawn_tiles_around(count: int = 4):
 				
 			if item_id != -1:
 				var main = get_tree().get_root().get_node_or_null("Main")
-				if main:
+				if main and can_rpc():
 					main.rpc("sync_grid_item", pos.x, 1, pos.y, item_id)
 					spawned += 1