Show the coverage badge in the README

[tschm]

Coverage is already measured, published and sitting at 100% — the badge SVG and the HTML report are both live — but the README never linked either, so the number was reachable only by knowing the URL.

It also left the coverage column blank for this row in the tschm profile table, which harvests the badge from each repository's own README rather than reconstructing it, so that a project decides for itself what it publishes and under which URL.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Added a test coverage badge to the README.
  • The badge links directly to the generated HTML coverage report.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: abac1fcf-ed05-44b4-81ad-4cdcd7b1da38

📥 Commits

Reviewing files that changed from the base of the PR and between 7c32e9e and 60e0797.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

README.md now includes a coverage badge that links to the generated HTML coverage report.

Changes

Coverage documentation

Layer / File(s)	Summary
Add coverage badge README.md	Adds a coverage badge linked to the generated HTML coverage report.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: copilot

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description explains the change but omits the required Summary, Changes, Testing, Checklist, and issue reference sections.	Use the repository template and add the required sections, testing status, checklist items, and issue reference or explain why they are not applicable.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: adding the coverage badge to the README.
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 coverage-badge

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[Copilot]

Pull request overview

Adds a coverage badge to the repository README so the already-published coverage status and HTML report are discoverable directly from the project’s landing page (and can be harvested by external profile tooling that reads badges from README).

Changes:

• Add a Coverage badge to README.md linking to the published HTML coverage report.

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