Add .gitattributes to enforce LF line endings for consistent reviewmark fingerprints

[Copilot]

Pull Request

Description

The reviewmark tool computes SHA256 fingerprints to detect file modifications, but git's platform-dependent line-ending normalization causes fingerprint mismatches across Windows and Unix environments. Adding .gitattributes enforces consistent LF checkout for all text files, with CRLF preserved for Windows batch files that require it.

Changes:

• .gitattributes — new file at repo root:
  • * text=auto eol=lf — normalizes all text files to LF on checkout, ensuring stable SHA256 fingerprints regardless of developer OS
  • *.bat / *.cmd — explicitly set to eol=crlf since Windows batch files require CRLF to execute correctly

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code quality improvement

Related Issues

Pre-Submission Checklist

Before submitting this pull request, ensure you have completed the following:

Build and Test

• Code builds successfully: dotnet build --configuration Release
• All unit tests pass: dotnet test --configuration Release
• Code produces zero warnings

Code Quality

• Code formatting is correct: dotnet format --verify-no-changes
• New code has appropriate XML documentation comments
• Static analyzer warnings have been addressed

Quality Checks

Please run the following checks before submitting:

• All linters pass: ./lint.sh (Unix/macOS) or cmd /c lint.bat / ./lint.bat (Windows)

Testing

• Added unit tests for new functionality
• Updated existing tests if behavior changed
• All tests follow the AAA (Arrange, Act, Assert) pattern
• Test coverage is maintained or improved

Documentation

• Updated README.md (if applicable)
• Updated ARCHITECTURE.md (if applicable)
• Added code examples for new features (if applicable)
• Updated requirements.yaml (if applicable)

Additional Notes

Note: developers on Windows may need to re-checkout affected files after this change is merged to have git re-normalize line endings (git add --renormalize .).

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[Copilot]

Pull request overview

Adds a repo-root .gitattributes to make line ending normalization deterministic across platforms, preventing reviewmark SHA256 fingerprint mismatches between Windows and Unix checkouts.

Changes:

• Enforce LF line endings on checkout for all text files (* text=auto eol=lf).
• Preserve CRLF for Windows batch scripts (*.bat, *.cmd) to maintain runtime compatibility on Windows.

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