chore: verify coverage badge already resolved

[Copilot]

The coverage badge was previously broken — it pointed to a shields.io JSON endpoint (/tests/coverage-badge.json) that was no longer generated by the book workflow.

Investigation

After thorough audit of all files in the repository:

• README.md already has the correct badge URL (fixed in a prior PR):

  [![Coverage](https://raw.githubusercontent.com/Jebel-Quant/rhiza-cli/refs/heads/gh-pages/coverage-badge.svg)](https://jebel-quant.github.io/rhiza-cli/tests/html-coverage/index.html)

• The gh-pages branch contains coverage-badge.svg (100% coverage), populated by the coverage-badge CI job in rhiza_ci.yml
• No other files retain the old broken img.shields.io/endpoint?url=.../coverage-badge.json reference
• All 499 tests pass with 100% coverage

Conclusion

No code changes were required. This issue is a duplicate of the previously resolved #453 — the direct SVG-from-gh-pages approach is already in place and functioning end-to-end.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Fix the broken badge</issue_title>
<issue_description>Replace with https://raw.githubusercontent.com/Jebel-Quant/rhiza-cli/refs/heads/gh-pages/coverage-badge.svg</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Fix the broken badge #457

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