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caps/snap2.md: add snap v2 documentation#269

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nerolation:toni/add-snap2
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caps/snap2.md: add snap v2 documentation#269
nerolation wants to merge 1 commit into
ethereum:masterfrom
nerolation:toni/add-snap2

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Add snap/2 protocol spec (EIP-8189)

  • New: caps/snap2.md — delta spec over snap/1
  • BAL-based catch-up replaces iterative trie healing
  • Add: GetBlockAccessLists (0x08) / BlockAccessLists (0x09)
  • Remove: GetTrieNodes (0x06) / TrieNodes (0x07), IDs reserved
  • Messages 0x00–0x05: unchanged, inherited from snap.md
  • New: in-line BAL apply on pivot advance
  • New: reorg-past-pivot recovery via orphaned-fork BALs + leaf re-fetch
  • Retention: canonical + non-canonical BALs within EIP-7928 window
  • Touched: caps/snap.md change log, README.md
  • Requires: EIP-7928 (block-access-list-hash header field)

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