ci: migrate coverage to cargo-llvm-cov

[acgetchell]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 99286b1b-6433-4a6e-89c0-3bdf39cfca4f

📥 Commits

Reviewing files that changed from the base of the PR and between c6e04fd and f75a01c.

📒 Files selected for processing (4)

• .github/workflows/codecov.yml
• README.md
• docs/COVERAGE.md
• justfile

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/101-llvm-cov

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.81%. Comparing base (c6e04fd) to head (f75a01c).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #102      +/-   ##
==========================================
+ Coverage   91.40%   99.81%   +8.40%     
==========================================
  Files           5        5              
  Lines         512     2146    +1634     
==========================================
+ Hits          468     2142    +1674     
+ Misses         44        4      -40     

Flag	Coverage Δ
unittests	99.81% <ø> (+8.40%)	⬆️

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