Implement Keccak-based MMR frontier#2245

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Fumuran wants to merge 16 commits intoagglayerfrom

andrew-keccak-based-mmr-frontier

Commits on Jan 9, 2026

feat: impl fist frontier version, add (yet buggy) test
Fumuran
committed

Commits on Jan 11, 2026

Commits on Jan 13, 2026