docs: fix WebAssembly test link

[dajiaohuang]

Summary

• fix the relative link to the WebAssembly Node test in wasm/README.md
• keep the link relative to the README's own directory so it resolves to the tracked wasm/test.mjs

The current wasm/test.mjs target is interpreted from wasm/README.md as wasm/wasm/test.mjs, which does not exist.

Verification

• checked all 19 relative links across the repository's 12 tracked Markdown files; zero broken links after this change
• git diff --check

This is documentation-only and does not change the WebAssembly package or runtime behavior.

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Summary by cubic

Fixes the broken WebAssembly test link in wasm/README.md so it resolves to the tracked wasm/test.mjs instead of the nonexistent wasm/wasm/test.mjs. Documentation-only; no runtime behavior changes.

^{Written for commit a6f3aba. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 1 file

_{Re-trigger cubic}