[WIP] Add automated tests and coverage reporting

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add automated tests and coverage reporting</issue_title>
<issue_description>### Description
Currently, there’s no visible unit/integration test suite.
Benchmark registration, engine loading, and run/eval paths need validation for correctness.

Expected Behavior

CI should automatically run tests on PRs and display coverage.

Suggested Fix

• Create tests/ directory using pytest.
• Add sample tests for:
  • kaprese.benchmark registration
  • kaprese.engine initialization
  • kaprese run execution flow
• Configure GitHub Actions to:
  • Run tests
  • Upload coverage to Codecov
• Add badges for “Build Passing” and “Coverage”.

Example Badge

</issue_description>

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

• Fixes Add automated tests and coverage reporting #82

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[henrylee97]

@hyun-hyang, Thank you for your interest in our project. However, we kindly decline AI-only contributions.

[Copilot]

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