Upgrade to Wasm 2.0

[Terricide]

Hi I tasked Claude code to upgrade to Wasm 2.0, it says that it has done it and written a bunch of unit tests. Would you like me to create a pull request for it?

[RyanLamansky]

I replied on your PR. Basically it needs to be sliced into human-reviewable portions and verifiably pass the official spec tests.