test: L2 chain-specific threshold signing test suite#6

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abhicris wants to merge 3 commits intoluxfi:mainfrom

kcolbchain:feat/l2-chain-tests

Commits on Apr 7, 2026

fix: add mutex to FROST sign rounds (concurrent map write at 8+ signers)
hanzo-dev
committed
fix: LSS keygen race condition — use MarshalBinary instead of Equal (dcrd ToAffine mutates)
hanzo-dev
committed

Commits on Apr 10, 2026

test: add L2 chain-specific threshold signing test suite
abhicris
committed