Low-Temp Heat-Pump Radiator Readiness Auditor (ΔT50 to ΔT25 Derating)

Deterministic EN 442 non-linear radiator thermal emission exponent Q_real = Q_50 * (LMTD / 49.83)^n (n = 1.28..1.35) engine (.pdf, .csv, .json) built for Purmo, Kermi, Zehnder, Daikin Altherma — zero-upload ephemeral Wasm RAM execution.

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