author here!
I have been working on this for my own use until recently, when I shared with the rest of the team, and we thought it would be nice to let the world see it.
I have been interested in autonomous code development for quite some time (at least since March/April 2025) - and summer '25 is when I felt the models were good enough to be pushed to autonomy.
I wrote a bit about it[0], and sgai is the incarnation of my take on AI autonomous coding.
sgai is not even v0 yet, a lot of work to be done to improve its implementation - but I think it should be usable enough for those willing to give it a try.