docs: remove TypeScript coverage references and rename test section

Jiaan Louwrequested to merge
duo-edit-20260212-123359 into main

Summary

Updates README.md to reflect the removal of the TypeScript package:

  • Removes TypeScript coverage badge from header
  • Removes TypeScript coverage link from Code Coverage section
  • Renames "TypeScript Tests" section to "WASM Package Tests" for better accuracy

The WASM package tests section is retained since the project still has WASM-related tests written in JavaScript/TypeScript for testing the npm package bindings.

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