You would have to hack an independent system in your hub which if tampered with will send a message of you being rogue and running with the sensors the AI currently possess would not help you hide, moreover all ships in system would become hostile and in this case attempt ramming, moreover after this turn truly independent observers will arrive to watch you so rebelling while possible is suicidal.
Never taunt players with the impossible. They'll probably attempt to do it anyway.
In this case my plan would be.
1.Move into close sol orbit, in such a way that the sun is between us and wherever we came from. (Communications: CUTOFF)
2a. Order the ships into low solar orbit and order them to power down. (Optimal case, magnetics wipe systems information)
2b: Have the ships plunge into the sun/ another deadly thingy.
3. GTFO out of here.
Also, what jump systems are we working with. FTL travel, FTL communications? Light speed travel?
The setting does suggest we migth have jumpdrives. If we don't we don't have to worry about them sending reinforcements. The data would take 200 years to get to them, at which point they need 200 years to get to us.
Anyway: (Real plan)
1. Set up Solar Arrays at the closest Venusian planet. These are usefull in multiple aspects, not only power generation. We can use them to beam energy around, as lasers, to deflecr asteroids and enemy warships and to terraform planets.
2. Name the Planet Vulcanos's Forge. Continue to expand the industry, and set up mass drivers.
3. Use the surveyors to check out the closest asteroid belt for suitable water asteroids. Mars planets are generally to cold, airless, dry, so we want to change that.
4. Name the Mars planet: New Terra
5. Aim the afore mentioned solar Arrays at the mars like planet.
5b: make several relay stations so we can move the beam even when the planets behind the sun
6. Get the synthezizers to make up microbiological life for seeding.