Weight-fraction-weighted compound indices (identical convention to hhi_score in magnet_dataset_clean): hhi_score (reserve), hhi_production_score, cost $/kg (live spot preferred, 2013 reference fallback), tox_score, GWP and CED per kg — each with element coverage and missing-element list. Provide 'composition' (formula string) or 'cif' (CIF text).

Weight-fraction-weighted compound indices (identical convention to hhi_score in magnet_dataset_clean): hhi_score (reserve), hhi_production_score, cost $/kg (live spot preferred, 2013 reference fallback), tox_score, GWP and CED per kg — each with element coverage and missing-element list. Provide 'composition' (formula string) or 'cif' (CIF text).