I'd like to be proven wrong but I'm feeling the same point Carmack was making about not building "VR" operating systems[1][2] applies to "AI" browsers as well. It seems like a futile effort especially considering revenue generation and it seems pointless to not pick Chromium for that even if you're hellbent on going down that road.
[1]: https://xcancel.com/ID_AA_Carmack/status/1961172409920491849 [2]: https://news.ycombinator.com/item?id=45066395