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    "First two filled fields define the known pair"
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    "Resistive model only",
    "Fewer than two inputs throws; zero divisors yield 0 for dependents"
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  "boundary_conditions": [
    "Fewer than two of P,V,I,R → NEEDS_TWO_INPUTS",
    "Non-finite → INVALID_NUMBER",
    "Division by zero → 0 for the dependent unknown — soft boundary",
    "Resistive model only; not for reactive impedance"
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      "title": "NIST Guide to the SI (SP 811)",
      "section": "Watt, volt, ampere, and ohm relationships in the SI",
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      "section": "Resistance (IEV 131-12-04)",
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      "title": "BIPM SI Brochure (9th edition, version 4.01)",
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      "url": "https://www.bipm.org/en/publications/si-brochure",
      "supports": "V, A, Ω, W coherent unit relationships",
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      "doi": "https://doi.org/10.59161/AUEZ1291"
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      "code": "NEEDS_TWO_INPUTS",
      "error": "wattVoltAmp needs any two of P,V,I,R"
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