Publish coverage as gist badge instead of Codecov

[JulianSchmid]

Summary by CodeRabbit

• New Features

  • Added a coverage status badge to the README and documentation template.
  • Coverage reporting now displays the percentage for production code, excluding test files.
  • The coverage badge is automatically updated with the latest percentage and corresponding status color.

• Documentation

  • Updated project documentation to include the new coverage status indicator alongside existing project badges.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d3bc9d20-3db1-4b75-8731-8e436c0c50e8

📥 Commits

Reviewing files that changed from the base of the PR and between c8ccb06 and 17a3416.

📒 Files selected for processing (1)

• .github/workflows/coverage.yml

📝 Walkthrough

Walkthrough

Coverage reporting now generates metrics without test files, publishes the resulting percentage through the master-branch workflow, and exposes a coverage badge in the README and template.

Changes

Coverage reporting

Layer / File(s)	Summary
Generate test-excluded coverage coverage/coverage.bash	Adds export_without_tests.json using the merged profile while excluding etherparse/tests/.
Publish coverage badge .github/workflows/coverage.yml	Reads the exported percentage and conditionally updates the master-branch dynamic coverage badge gist.
Expose coverage status README.md, README.tpl	Adds coverage status badges to the README and its template.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: switching coverage publication from Codecov to a gist-based badge.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch migrate-coverage-to-gist-badge

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