v0.14.2: Degenerate Axis Handling and Bug Fixes

🚀 Major Improvements

✅ Degenerate Axis Handling

• Fixed numpy.gradient() crashes for reactor libraries with single-value parameters
• Implemented automatic axis duplication for degenerate axes (e.g., mod_dens = 0.723)
• Added robust edge case handling for negative, zero, and large parameter values
• Enhanced GridGradient quality calculations - now properly handles all reactor library types

🐛 Bug Fixes

• Fixed undefined variable nuclide_amount reference in get_nuclides method
• Fixed invalid escape sequences in regex patterns and LaTeX strings
• Improved error handling for real-world reactor data characteristics

🧪 Testing Improvements

• Added comprehensive test coverage for degenerate axis scenarios
• Fast unit tests (<0.005s) for mathematical logic validation
• Real data integration tests using existing w17x17.arc.h5 test data
• Performance optimization - test suite completion time reduced from 9+ minutes to ~2.5 minutes

📚 Documentation & Development

• Reorganized cursor rules into core governance (.cursor/rules/core.mdc) and technical patterns (.cursor/rules/memory-bank.mdc)
• Documented bumpversion workflow and development best practices
• Added testing patterns and performance guidelines for future development

🔧 Technical Details

• Quality score improvements - w17x17.arc.h5 now produces expected q1≈0.779, q2≈0.98
• Backward compatibility maintained - all existing functionality preserved
• Multi-Python support - tested on Python 3.9, 3.10, and 3.11

This release significantly improves the reliability of OLM when working with reactor libraries containing degenerate interpolation axes, a common scenario in ORIGEN data.

v0.14.0

Bump version: 0.13.1 → 0.14.0

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