Modernize pre-commit: replace black with ruff, use isort with plone profile

[jensens]

Summary

This PR modernizes the pre-commit configuration by replacing black with ruff for linting and formatting, while keeping isort for import sorting with the plone profile.

Changes

Pre-commit Configuration:

• Replace black with ruff for both linting and formatting
• Configure ruff with:
  • line-length = 120
  • target-version = "py310"
  • Enable rules: E, W, F, UP, D
  • Ignore docstring rules: D100-D107, D202, D205, D301, D400, D401, D415
  • Ignore F841 (unused variables) in tests directory
• Keep isort with plone profile and force-alphabetical-sort configuration
• Add setuptools as additional dependency for isort (Python 3.13 compatibility)

Code Quality Fixes:

• Fix undefined s() function in svn.py → use stderr.decode()
• Fix undefined b() function in test_mercurial.py → use b":" literal

Configuration Updates:

• Update pyproject.toml with ruff and isort configurations
• Update .pre-commit-config.yaml with new hooks
• Makefile auto-updated by mxmake (qa.black → qa.ruff)

Code Formatting:

• Applied ruff-format to all files
• Applied isort with plone profile to all files

Benefits

• Faster: Ruff is 10-100x faster than black + flake8
• Modern: Better Python 3.10+ support
• Consistent: Same code style, just faster tooling
• CI Speed: Faster pre-commit and CI runs

Testing

• ✅ All 174 tests pass
• ✅ All pre-commit hooks pass
• ✅ No functional changes to code logic

Related

This builds on PR #63 (Python 3.10+ migration).