core, blockstm, state: add BlockSTM v2 parallel transaction execution#2210

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cffls wants to merge 7 commits intodevelopfrom

blockstm_redesign

Commits on May 5, 2026

core, blockstm, state: add BlockSTM v2 parallel transaction execution
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core, vm: address PR review feedback on V2 follow-up

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core: skip witness-corpus tests cleanly when LFS testdata is missing

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core, blockstm, state, vm: fix lint failures

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core, blockstm: address inline PR review comments

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core, blockstm, state: address second round of inline review comments

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core/state: kill diffguard Tier-1 survivors on V2 PDB hot paths

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