docs(README): clarify base model licensing and reference license file

Add upstream MIT license for base model

doc(README): add details regarding type, range and distribution of the numbers used in the symbolic expressions

doc(README): rename section 'Limitations' to 'Disclaimer & Limitations'

docs(README): rewrite adapter READMEs for clarity and alignment

doc(README): update "Model details" and "Uses" section

doc(README): update example to use symbolic expression input format

doc(README): finalize model card with clarified scope, evaluation details, and usage framing

docs: fix link to calculator_eval_performance.py in Evaluation section

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initial commit