R/load_evidence_for_chrs.R
load_evidence_for_chrs.RdLoads the per-chr evidence packets (evidence_chr{N}.rds) for a vector
of chromosomes and returns a flat named list keyed by region label. Used by a
drill-down stage to avoid materialising all 22 packets when only a handful of
chrs contain top hits.
load_evidence_for_chrs(evidence_dir, chrs)A flat named list of region evidence-packet entries, keyed by region label.
Packets are flat-merged across chromosomes; genome-wide region labels are unique, so no label collides. Errors loudly if any requested chr's packet is missing.