fix(conversion): default to reference when converting shapes

[GeezFORCE]

Description

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 refactoring
• Performance improvement

Testing

Please describe the tests you ran to verify your changes:

• Existing tests pass (npm test)
• Added new tests for new functionality
• Tested manually with sample SHACL files

Checklist

• My code follows the project's code style
• I have run npm run fix:lint-format
• I have added tests that prove my fix is effective or that my feature works
• All tests pass locally with my changes
• I have updated the documentation (if applicable)
• My changes generate no new warnings
• I have checked my code and corrected any misspellings

[GeezFORCE]

🎉 This PR is included in version 1.7.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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