When did Baryon mode come out?

Could you tell me, when exactly did the Baryon mode first make its debut? Is it a feature that was introduced in a particular update or patch? And if so, could you provide any details on the specific version or release that it was introduced in? I'm particularly interested in knowing the timeline of its introduction, as I'm trying to understand its evolution and impact within the broader context of the technology or platform it's associated with.