SlashScreen/ricket: An experimental WASM runtime for Plan 9

Neat. I've worked on some similar projects in the past

I have previously ported w2c2 to Plan 9 here: https://github.com/euclaise/w2c9

It ran basic Rust code fine.

I later managed to run C++ code without wasm, by (partially) porting musl and doing some linker hacking here: https://sr.ht/~euclaise/cross9/