fix(mimic-iv): exclude C4A from Charlson malignant_cancer mapping

[Chessing234]

Summary

• Split the ICD-10 C45–C58 malignant-cancer range so C4A (Merkel cell carcinoma) is excluded, matching Quan et al. (2005) skin-malignancy exclusion
• Document that ICD-10-CM extensions C4A/C7A/C7B are outside the WHO ICD-10 ranges used in the publication
• Regenerate postgres and duckdb copies

Test plan

• pytest tests/test_transpile.py
• CI concept build on MIMIC-IV demo

Fixes #2017

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