wkg wit output does not preserve comments in worlds

[wingo]

Steps to reproduce:

mkdir wit
cat > wit/world.wit <<EOF
package test:test;

world test {
    include wasi:http/proxy@0.3.0-rc-2025-08-15;
}
EOF
wkg wit fetch

Expected results: wit/deps/wasi-http-0.3.0-rc-2025-08-15/package.wit contains comments for world proxy

Actual results: Comments everywhere else; nice! But no comments from inside worlds, e.g. from https://github.com/WebAssembly/wasi-http/blob/main/wit-0.3.0-draft/proxy.wit.

[lann]

Upstream issue in wit-parser: bytecodealliance/wasm-tools#2294