So I was doing a luddic path run and I have been truly blessed.
I found a system that is east of the core, it's an orange star called Beta Svanga. It does not have any domain era space infrastructure but it has 3 stable locations so you can make sensors arrays, coms relays and nav. buoys.
It has a Terran world with 75% habitability. It is very good for farming and a regular amount of organics and ores so you can add soil nanites.
It has a barren world that had +3 ore and rare ore. It is extremely hot and has no atmosphere. It has vast ruins, when I explored them I found a synchrotron core.
It has 3 other habitible planets that idividually are not very impressive.
And a gas giant, a plasma dynamo will easily make it very productive. (I already found 1)
Did I also mention that there is a cryosleeper in the system?
Here is the map seed. Praise Ludd. MN-8709790967309667772