feat: devnet4 #686

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GrapeBaBa wants to merge 15 commits intomainfrom

gr/devnet4-on-656

Commits on Mar 26, 2026

feat: port devnet4 non-overlapping files from gr/devnet4
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feat: port dual keypairs key-manager from devnet4
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feat: port block.zig with #656 SignaturesMap + devnet4 aggregation
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feat: apply SignedBlock rename and dual-key refactoring across all packages
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fix: update tests for dual-key Validator struct changes
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fix: correct metric names and field references after rebase
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fix: memory leak in AggregateInnerMap — participants not freed after aggregate()
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chore: update leanSpec and lean-quickstart submodule pointers
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refactor: align naming with leanSpec #449 and fix SignedBlock flattening
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refactor: align with leanSpec a5df895..d0c5030
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fix: correct fork choice spec test attestation handling
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