Add HVTracker badge to README?

Hi maintainers — HVTracker currently ranks **A2A / Agent2Agent Protocol** #13 with an **HVTrust score of 87.5/100** and evidence grade **B**.

If useful, would you be open to adding the live HVTracker badge to your README so users can inspect the trust profile directly?

Markdown snippets:

```md
[](https://hvtracker.net/agents/a2a-agent2agent-protocol/)
[](https://hvtracker.net/agents/a2a-agent2agent-protocol/)
```

Profile: https://hvtracker.net/agents/a2a-agent2agent-protocol/

Totally fine to close if this is not useful — just thought it might be helpful for maintainers who want an independent trust/status link in their repo.

The README file is at the root of the repository. Add the provided markdown badge snippets to an appropriate section, likely near the top or in a badges/status section. Verify the badge renders correctly by checking the preview in the GitHub interface. Ensure the links are correct and the badge aligns with the project's documentation style.

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