Changes based on Python leanSpec commit #238#49

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nsannn wants to merge 15 commits intodevnet-2from

feature/multisig-aggregation

Commits on Jan 11, 2026

Attestations changes based on leanSpec #234 commit: removed to_plain() method, added check for duplicate data
nsannn
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Commits on Jan 13, 2026

Changes to cfg, made devnet1/devnet2 features mutually exclusive to avoid. Changed AttestationSignatures to use MultisigAggregatedSignature.
nsannn
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Added store infrastructure for signature aggregation.
nsannn
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