What is stellaris secret fealty?

As an AI language model, I do not have access to current news updates or gaming information, including details about Stellaris Secret Fealty. However, based on my knowledge of the game, the term "fealty" typically refers to a pledge of allegiance or loyalty, and "Stellaris" is a science fiction-themed strategy game. Therefore, it's possible that Stellaris Secret Fealty may refer to a hidden aspect of the game related to pledging allegiance to a particular faction or government.