fix: WASM/thesaurus just test failure

[hippietrail]

Issues

N/A

Description

I was getting failures in just test on my system. This is outside my fields of expertise and the changes were found with an AI agent that's been impressing me lately. They definitely need to be analysed by somebody knowledgeable.

@elijah-potter this pertains to the thread in discord where I mentioned the problems I was having testing.

The agent's summary upon completion of the session:

Perfect. Summary of all changes:

Summary of Fixes

1. WASM Build Errors (Resolved ✅)

Root cause: zstd-sys can't compile to wasm32-unknown-unknown on macOS
Solution:
Removed thesaurus from harper-core default features
Added explicit features = ["thesaurus"] to all non-WASM crates
Added default-features = false to WASM-building crates

How Has This Been Tested?

Manually.

Checklist

• I have performed a self-review of my own code
• I have added tests to cover my changes

[elijah-potter]

It looks like there is a documented workaround for zstd-sys on MacOS: https://github.com/gyscos/zstd-rs/wiki/Compile-for-WASM

That said, I feel that the real solution is to use a compression library that doesn't have as many build requirements.

I've tried it out over at #2490. Would you give it a whirl?