Villa Stairwell Motorized-Skylight Thermal-Buoyancy Night-Purge Free-Cooling Sizer

Deterministic Two-opening thermal buoyancy stack airflow Q = C_d * A_eff * sqrt(2*g*H_stack * (T_in - T_out)/T_in) with effective series area A_eff = A1*A2/sqrt(A1^2+A2^2) engine (.pdf, .json, .yaml) built for Velux, Fakro, Lamilux, Schuco — zero-upload ephemeral Wasm RAM execution.

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