def primary_stat
      @primary_stat ||= manifest.stats.filter(primary: true).with_context([self]).map { |name, value| [name, value] }.first&.last
    end
def primary_stat
      @primary_stat ||= manifest.stats.filter(primary: true).with_context([self]).map { |name, value| [name, value] }.first&.last
    end
Public: Returns the value of the registered primary stat.