I understand that we've gotten descriptions of the Soldiers in the universe section on Waypoint. They're automatons created specifically for the war against ancient humans, mostly used for boarding action and navigating the smaller hallways aboard human ships/interfacing with human systems/operating human vehicles and technology. However, they have a lot of similarities to the Promethean Knights, who we know to be composed Forerunners and humans. Are the Soldiers also supposed to be composed individuals, or are they simply highly-intuitive Forerunner AIs?

In the final Blue Team level, Exuberant Witness exclaims something to the effect of "Oh, the Warden is not a robot. I thought you knew that?" Is he a composed Forerunner? The embodiment of the Domain? An AI created by the Forerunner to protect the Domain? Something left behind by the Precursors and manifest in Forerunner tech?

Is this information anywhere in the game?