ClOx

Stratospheric ClOx catalytic ozone destruction cycle (Seinfeld & Pandis 2006, Ch. 5 §5.5.1). Migrated from GasChem.jl@8c12c048 src/StratosphericChemistry.jl:272 (`ClOxCycle` @component). Implements 4 ODEs (Cl, ClO, HCl, ClONO2) coupled to 2 algebraic family sums (ClOx = Cl + ClO, Cly = Cl + ClO + HCl + ClONO2). Rate coefficients are Arrhenius (k = A·exp(C/T)) for the five binary reactions and a (T_ref/T)^3.4 form for the termolecular ClO + NO2 + M → ClONO2 channel. All upstream `@constants` are encoded as parameters with their literal SI defaults; physical-condition `@parameters` (T, M, photolysis rates, fixed-bath species O, O3, NO, NO2, OH, CH4) are also parameters so the cycle can be exercised at different atmospheric conditions.