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* feat: add Chlorine (Cl2) fundamental equation of state Implements the EOS from Thol, Herrig, Span, Lemmon (AIChE J. 67, e17326, 2021, DOI: 10.1002/aic.17326) for chlorine (CAS 7782-50-5). - 10-term polynomial/exponential residual + 5-term Gaussian bell-shaped - Ideal gas: diatomic (2.5) + 3 Planck-Einstein terms (800/3000/8200 K) - NBP reference state (h=0, s=0 at saturated liquid, 101325 Pa) - Saturation ancillaries: pS, rhoL, rhoV from REFPROP coefficients - Valid range: 172.17 K to 525 K, up to 20 MPa - Adds BibTeX entry Thol-AICHE-2021 Closes #2714 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * feat: add superancillary equations to Chlorine EOS Builds Chebyshev superancillary for Cl2 covering the full saturation curve from Ttriple (172.17 K) to near-critical (416.865 K, 61 intervals). Errors away from the critical region are at machine- precision level (~1e-13 %). The fastchebpure builder was also patched to prune near-critical intervals where the pressure Chebyshev expansion becomes non-monotone due to ill-conditioned VLE convergence at very small Theta; 3 such intervals were removed for Chlorine (Theta ~ 2.3e-7). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * Bump fastchebpure release to 2026.04.16 to fix docs CI failures Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> --------- Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>