Devnet4 Phase 4: network type cascade and test harness updates#233

Draft

pablodeymo wants to merge 12 commits intodevnet4from

devnet4-phase4-network

Commits on Apr 1, 2026

Devnet4 types: dual-key Validator, SignedBlock, genesis config format
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Devnet4 key manager and block proposal: dual keys, sign block root
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Devnet4 store and verification: dual-key verification, remove proposer attestation
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Devnet4 network layer and tests: type cascade, test harness updates
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Update ignored SSZ test message to reflect devnet4 layout change
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Remove unused local_validator_ids parameter from on_block
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Add missing AggregatedSignatureProof import in storage crate
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Fix formatting in storage import
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Add proposal signing metrics, pin genesis root hashes, fix stale comment
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Update stale references from devnet4 type rename across docs and tests
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Bump leanSpec to 488518c to fix dual-key test fixture generation
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Bump leanSpec to HEAD (9c30436) and adapt test harness to new fixture format
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