Add pre-commit hooks for black and markdownlint

[Copilot]

Adds automated code formatting enforcement via pre-commit hooks.

Changes

• .pre-commit-config.yaml: Configured black (line-length=119) and markdownlint hooks
• pyproject.toml:
  • Added [tool.black] config with line-length=119, target versions py310-py313
  • Added black and pre-commit to dev dependencies
• Code formatting: Applied black to 6 Python files (checker.py, test files, docs/conf.py)
• CONTRIBUTING.md: Added pre-commit installation step and usage instructions

Usage

pip install -e ".[dev]"
pre-commit install  # Auto-runs on commit
pre-commit run --all-files  # Manual run

Notes

• Black line-length (119) differs from ruff (100) to match existing markdownlint config
• Black doesn't support py314 yet, limited to py313

Original prompt

Can we add precommit hooks to run black (with line length=119 characters) and markdownlint to fix python and markdown fomatting issues?

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[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (ee97d34)	291	271	93.13%
Head commit (eabaff3)	291 (+0)	271 (+0)	93.13% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#36)	7	7	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[coveralls]

Pull Request Test Coverage Report for Build 21914081118

Details

• 7 of 7 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 93.127%

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Totals
Change from base Build 21913913712:	0.0%
Covered Lines:	271
Relevant Lines:	291

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💛 - Coveralls