Why do you say it needs more time in the oven? I've had zero issues with it as a drop-in replacement for Pip in a large commercial project, which is an extremely impressive achievement. (And it was 10x faster.)
I tried Poetry once and it failed to resolve dependencies on the first thing I tried it on. If anything Poetry needs more time in the oven. It also wasn't 10x faster.
Nice work. Aren't wasm proc macros already prototyped in Watt though?