Collect code coverage in CI

[hahn-kev-bot]

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AI-generated summary

Final batch from the test-suite review — a process fix. CI ran plain dotnet test with no coverage collection, so there was no coverage measurement or trend even though coverlet.collector is already referenced by the test project.

• Adds --collect:"XPlat Code Coverage" --results-directory <workspace>/coverage to the existing test run.
• Uploads the resulting coverage.cobertura.xml as a coverage build artifact (if: !cancelled() so it is captured even on test failure; if-no-files-found: error so a silent break in collection fails loudly).
• Uses actions/upload-artifact@v4; validated with actionlint (1.7.12) and confirmed locally that collection produces the cobertura file.

The benchmark step and its artifact path are unchanged.

Test plan

• actionlint .github/workflows/test.yaml passes.
• Verified locally that dotnet test --collect:"XPlat Code Coverage" --results-directory <dir> writes coverage.cobertura.xml.

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Configuration used: defaults

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Run ID: 82520a87-a9fd-49c5-a3d1-081f24450ee6

📥 Commits

Reviewing files that changed from the base of the PR and between 03f609f and 98a6320.

📒 Files selected for processing (1)

• .github/workflows/test.yaml

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