feat: Implement core game logic, player script, and the Stop n Go game mode with its dedicated manager.

scenes/main.gd

@@ -759,6 +759,10 @@ func _start_game():
 		if LobbyManager.game_mode == "Tekton Doors" and portal_mode_manager:
 			portal_mode_manager._randomize_connections()
 			
+		# STOP N GO: Rotate players to face East BEFORE countdown
+		if LobbyManager.game_mode == "Stop n Go" and stop_n_go_manager:
+			stop_n_go_manager.rotate_players_to_start()
+			
 		await _start_pre_game_countdown()
 		
 		GameStateManager.start_game()
@@ -1507,7 +1511,7 @@ func _deferred_set_player_goals(player_id: int, goals: Array):
 			ui_manager.update_playerboard_ui()
 
 
-@rpc("any_peer", "call_local")
+@rpc("any_peer", "call_local", "reliable")
 func sync_playerboard(player_id: int, new_playerboard: Array):
 	# Find the player and update their playerboard
 	var player = get_node_or_null(str(player_id))