Summary by cubic

Updated the Hopper Security sponsor section in README.md to add a clear description and a direct sponsor link, improving clarity and consistency.

• Docs

  • Added a concise description of Hopper’s secure open-source registry.
  • Added a sponsor link to https://hopper.security/ with readme_sponsorlist UTM.
  • No functional/code changes.

• Testing

  • Docs-only change; no tests needed.

^{Written for commit ffd0875. Summary will update on new commits.}