Release v1.0: HPRC-trained 35/21-feature calibrated SV+STR models (#1)

v1.6: 23-feature SV model as external-validation primary; seq-only caller-independent secondary

Model card: add sequence-only headline model (seqonly/)

Fix tier override to apply full config rules (SV 5-rule->LOW, STR 6-rule->WARNING); document HPRC 194-genome multi-sample validation

SVSTR-Score v13 models, locus lookup, inference, model card, real cohort examples