[Psitticine]

The Stellar Manipulator star-destroyers will both take out all the planets as well as the star. I don't know if the Stellar Plasma Sphere could make a stable star in place of an unstable one. I've never had the tech and opportunity to test it at the same time!

The System Gravitational Shield facility is supposed to stop stellar manipulation in a system but the description (at least, and possibly the actual functioning) only mentions nebula and black hole creation. I don't know if it'd stop the Stellar Nucleonic Torpedo, which blows up the star without making a nebula, or if it protects against random instabilities even if it does. Has anybody been able to test it until such circumstances?

I'm not sure what to think about sphere- and ringworlds aborting a stellar explosion. It seems pretty illogical to me, and I suspect they aren't actually supposed to be able to function that way, but there should be some way to prevent the big bang.