Checklist

• I have searched the existing issues and discussions for a similar question or problem.
• I have read the documentation and tried to find an answer there.
• I am using the latest version of Optiland (if not, please update and retry).
• I have tried to reproduce or debug the issue myself before opening this.
• I have included all necessary context, such as version info, error messages, or minimal reproducible examples.

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Bug Report

Describe the bug
The development environment setup has several inconsistencies that prevent contributors from following the instructions in CONTRIBUTING.md:

1. CONTRIBUTING.md instructs running pytest --cov=optiland --cov-report=xml, but pytest-cov is not in the dev dependency group
2. CI workflow manually installs dependencies with uv add --dev ... instead of using declared dependency groups
3. Contributors are required to run coverage manually, despite it being automated in CI
4. Project uses legacy [project.optional-dependencies] instead of modern PEP 735 [dependency-groups]

To Reproduce
Steps to reproduce the behavior:

1. Clone the repository
2. Run uv sync --dev to install development dependencies
3. Follow CONTRIBUTING.md and run pytest --cov=optiland --cov-report=xml
4. See error: pytest: error: unrecognized arguments: --cov=optiland --cov-report=xml

Expected behavior

• Development dependencies should include all tools mentioned in CONTRIBUTING.md
• CI workflow should use uv sync --dev to ensure reproducibility
• CONTRIBUTING.md should align with actual CI requirements (coverage is automated)
• Modern PEP 735 dependency groups should be used for better tooling support

Environment

• Optiland Version: 0.5.7
• Python Version: 3.10+
• OS: All
• Additional Info: Using uv for dependency management

Additional context
This affects all contributors trying to set up a development environment. The fix involves:

• Migrating to PEP 735 [dependency-groups]
• Adding pytest-cov to dev dependencies
• Updating CI to use uv sync --dev
• Updating CONTRIBUTING.md to remove redundant coverage instructions