Álvaro González 1d339653d5 feat: add formula data classes with strict JSON parsing ...

- Add VariableSpec class with magnitude field validation
- Add Formula class supporting multiple input/output variables
- Support d4rt_code as string or object with code field
- Add comprehensive tests for parsing and serialization
- Fix broken test import in pruebas_d4rt_test.dart

Follows README.md format requirements exactly

2025-08-21 17:15:00 +02:00

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