Range, format and consistency checks

Write rule checks for impossible values and record failures. Concepts: Validation rules; physical/business ranges Project A: duration_months 4–72; credit_amount 250–18,424 DM; age 19–75; installment_rate_pct and residence_years in 1–4; every categorical value is in the documented label list (a typo would create a new category). Project B: Load > 0 MW; temperature in Kelvin in the source (convert to °C); pressure has impossible values (e.g. > 1,100 hPa or near 0) → flag; wind speed ≥ 0.