should we add a typescript feature to the andromeda runtime to allow you to enable it if you're embedding and not messing with the novavm crate?

Yeah, maybe do a feature for each nova feature

I think some high level features like typescript or proposals would suffice. And users should add nova_vm dependencies for fine-grained control (like proposal-float16array).

Yeah, maybe do a feature for each nova feature

To which package should I add these features, core or runtime?

add them to the runtime package, probably can be assumed if you're including the andromeda core package you're probably using the nova_vm as a dep as well