Make codecov a dev dependency

[epenet]

Proposed change

Fixes #46

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass.
• There is no commented out code in this PR.
• The code has been formatted (make lint)
• Tests have been added to verify that the new code works.

Summary by CodeRabbit

• Chores
  • Updated project dependencies.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

📝 Walkthrough

Walkthrough

The codecov package was moved from runtime dependencies to development dependencies in pyproject.toml, ensuring it no longer becomes a transitive dependency for users installing the package.

Changes

Cohort / File(s)	Summary
Dependency Configuration pyproject.toml	Relocated codecov from [tool.poetry.dependencies] to [tool.poetry.group.dev.dependencies], changing it from a runtime to development-only dependency.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 Codecov hops away with glee,
No longer haunting dependency trees,
To dev tools it skips so bright,
Runtime bloat takes flight! ✨

🚥 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 pull request title 'Make codecov a dev dependency' is concise and directly summarizes the main change: moving codecov from runtime to development dependencies.
Linked Issues check	✅ Passed	The pull request successfully implements the core objective from issue #46: moving codecov from runtime dependencies to development dependencies in pyproject.toml.
Out of Scope Changes check	✅ Passed	The pull request contains only the necessary change to pyproject.toml moving codecov to dev dependencies, with no extraneous modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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