Re: specific questions
1) Uh? A Planet Destroyer with a 0 value would be unable to do anything at all, and would not result in an anti-stellar manipulation mine. The AI would likely build them if you script it to do so, and may or may not try to actually destroy enemy planets.
Oh, would you want to make Stellar Manipulation impossible over a planet in conjunction with the anti-Planet Destroyer facility? If so, this facility can only stop Planet Destroying (not relevant in your case), and not all the other Stellar Manipulations, and especially not Stellar Manipulation happening elsewhere in the system. System Gravitational Shielding abilities are the only ones preventing Stellar Manipulation in a system.
2) Yes (storms will do the same by the way).
3) To the best of my knowledge, no.
4) Fleet experience is supposed to work for fighters, but I haven't checked it. Good question about units being launched in battle: I have a hunch they wouldn't get any bonus, but that's just a hunch.
5) Units do not have ship experience, so it will not work.
6) Some abilities stack, others do not. More specifically, ECM/CS abilities stack so long as they are on different family components; I believe this is more of an exception than anything else, however. Others, like planetary/system production increase only take the highest value (or emissive armour for an example of a component ability). Different abilities always stack, even if they give a similar bonus (planetary/system production increase stack with each other).
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