The R-LWE threshold signature scheme is named Corona across the Lux
PQ family (consistent with node/vms/platformvm/platformvm_gpu.go +
threshold/pkg/thresholdd which already use CoronaPubkey). Ringtail
was the legacy name pre-2026-06.
Wire-compat alias for the legacy "ringtail" string is preserved in
threshold/pkg/thresholdd canonicalScheme() — that test pin still works.
Only changes here are field names on validator/audit-event structs.