Construct the linkage-disequilibrium decay analysis module descriptor
Source:R/module_ld_decay_registry.R
ld_decay_module_spec.RdThe descriptor owns the complete LD-decay registry contract: pairwise genotypic correlation (`SNPRelate::snpgdsLDMat()`, already a dependency) between nearby SNPs on the QC-passed, unpruned marker set, binned by physical distance into a mean-r-squared decay curve, while preserving the existing runner, result schema, and VCF-only behavior.