I reinstall the mod and begin gc again - in space battles AI works .
UPD: I have to say more - ai works on galactic map - rebels attacks pirates and my planets. But i don't know about construct they buildings and units or not.
Glad to hear it's working for you. As others have already said though, it is not perfect. There are some serious issues with the AI in PR 1.1 mainly due to the fact that the AI would not evolve with the changes made to the game. Check out the latest news post about the mod and you will see exactly what I'm talking about.
This AI will be much improved with the release of 1.2. Just be a little patient and the experience should be much better.