The embryo stuff ... I'm not sure. I think it would be easier to build a generation ship than an AI competent enough to raise functional humans. Human parents find it very difficult; and how much of it do we do instinctually, or take for granted, that we wouldn't know to program in?

A generation ship just requires the ability to move lots of mass in space. It's still far away, but I think it requires a lot fewer technologies that we don't understand. A competent enough AI to raise human children is so far beyond anything possible now as to require lots of radically new knowledge; a generation ship would mostly be larger scale applications of technology we understand in principle.