Add Copilot instructions and comprehensive test suite#1

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Copilot wants to merge 3 commits intomainfrom

copilot/add-copilot-instructions-file

Commits on Jan 4, 2026

Add comprehensive .github/copilot-instructions.md file

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nix1
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Clean up code and add comprehensive test suite (55 tests total)

Copilot
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nix1
committed
Update documentation and add docstrings to address review feedback

Copilot
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nix1
committed