Do the game creators own the code of their games or does Scirra own it? And if the game creators own the code, does Scirra have any legal or equity rights in the game?
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No. Scirra does not own any percentage or part of your game. Your creation is all yours.
Except of course, the C3 Splash screen, which you can pay to remove... or let there be.
Do they have rights to the underlying code (javascript), which I also understand may not be executable, but it is still assembled.
no; they only own the code that makes up Construct and it's runtime; Construct is considered a tool used to make your product. As for the runtime, although they own the rights to it, they give permission to you to package it in your game for distribution for free as long as you own a copy of Construct.
Thanks Faqro.