Change linter flake8 to ruff

[dfop02]

Migrate from Flake8 to Ruff

This PR migrates the project from flake8 to ruff as the linting tool.

Motivation

• Performance: Ruff is significantly faster than flake8 (10-100x)
• Modernization: Ruff is a modern tool that combines multiple linting tools
• Maintenance: Simpler and unified configuration

Changes Made

📦 Dependencies

• requirements_test.txt: Replaced flake8>=7.3.0 with ruff>=0.1.0

⚙️ Configuration

• pyproject.toml: Created new ruff configuration file with:

  • line-length = 127 (kept from flake8)
  • exclude: Same files/directories excluded
  • ignore: Equivalent rules (W292, E261, E302, E305)
  • Note: W504 and W601 were removed as they don't exist in ruff

• setup.cfg: Removed [flake8] section (configuration migrated to pyproject.toml)

🔧 CI/CD

• .github/workflows/tests.yml: Updated lint step to use ruff
  • Simplified to a single command ruff check . --output-format=concise
  • Maintains the same critical error checking functionality

Compatibility

• ✅ All flake8 rules were mapped to ruff equivalents
• ✅ Same files excluded from checking
• ✅ Same maximum line length of 127 characters
• ✅ All 66 tests continue to pass

Testing

• Ruff installed and working correctly
• Lint commands executing without errors
• All unit tests passing (66/66)

References

• Ruff Documentation
• Ruff GitHub

Checklist Before Requesting a Review

• I have performed a self-review of my code.
• My code follows the project's coding style and guidelines.
• I have run tests and verified that all existing and new tests pass.
• I have added new tests to cover my changes.