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    "Default uncorrelated (rho=0); optional correlations when provided.",
    "Linear propagation assumes a local first-order approximation is adequate. For significant model nonlinearity, consider higher-order treatment (JCGM 100:2008/Amd.1:2026) or Monte Carlo propagation (JCGM 101:2008)."
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    "Optional Quantity Engine v1.1: SI-prefix conversion + electrical derived rewrites (1000 mV + 2 V → 3 V; V/A → Ω; A·Ω → V; V×A → VA); different additive dimensions → UNIT_MISMATCH; not full SI algebra",
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    "confidence with nonzero ρ/correlations → CORRELATED_DOF_NOT_SUPPORTED (use fixed k)",
    "MC rectangular + correlation → CORRELATED_NON_NORMAL_MC_NOT_SUPPORTED (normal marginals only)",
    "Public Agent schema uses canonical field names only (components.u/c/x; correlations i/j as index or name). Runtime still accepts legacy aliases (ua/uncertainty/sensitivity/value) for compatibility."
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  "boundary_conditions": [
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    "Negative ua/ub → VALUE_MUST_BE_NON_NEGATIVE",
    "Unknown mode → INVALID_MODE",
    "Quotient with b=0 → DIVISION_BY_ZERO",
    "Product with a=0 or b=0 is allowed (absolute form); u_rel omitted when y=0",
    "sum/difference with unit_a ≠ unit_b → UNIT_MISMATCH",
    "rho ∉ [-1,1] → VALUE_OUT_OF_RANGE; k≤0 → VALUE_MUST_BE_POSITIVE",
    "RSS with correlations → INVALID_INPUT",
    "confidence with nonzero ρ/correlations → CORRELATED_DOF_NOT_SUPPORTED",
    "Monte Carlo rectangular + correlation → CORRELATED_NON_NORMAL_MC_NOT_SUPPORTED",
    "Monte Carlo quotient with >5% near-zero denominator draws → MONTECARLO_UNSTABLE",
    "n×n correlation matrix not positive semidefinite → CORRELATION_MATRIX_NOT_PSD (pairwise |ρ|≤1 is not sufficient for 3+ variables; singular PSD is allowed)",
    "Duplicate unordered (i,j) pair → DUPLICATE_CORRELATION; conflicting ρ for the same pair → CONFLICTING_CORRELATION"
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    {
      "title": "JCGM 100:2008 — Evaluation of measurement data (GUM)",
      "section": "Law of propagation of uncertainty",
      "url": "https://www.bipm.org/en/committees/jc/jcgm/publications",
      "supports": "u_c² = Σ (∂f/∂xᵢ)² u²(xᵢ) for uncorrelated inputs",
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      "supports": "Guidance on constructing measurement models for uncertainty evaluation",
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      "title": "NIST Technical Note 1297",
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      "title": "NIST Guide to the SI (SP 811)",
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      "url": "https://www.nist.gov/pml/special-publication-811",
      "supports": "Unit-consistent reporting of results and uncertainties",
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