Sepehr be70a7a6c7 feat(core): implement physical types with NewType pattern
Story 1.2: Physical Types (NewType Pattern)

- Add Pressure, Temperature, Enthalpy, MassFlow types
- Implement SI base units with conversion methods
- Add arithmetic operations (Add, Sub, Mul, Div)
- Add Display and Debug traits
- Comprehensive unit tests (37 tests)
- Add PSI and Fahrenheit conversions
- Code review fixes applied

All tests passing, clippy clean
2026-02-14 15:25:30 +01:00
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