Wire the NOMT binary merkle trie engine into geth's triedb/state
framework. This adds two new packages:
- triedb/nomtdb: backend implementing triedb.backend interface, manages
flat state persistence in ethdb and delegates trie ops to nomt/db
- trie/nomttrie: NomtTrie implementing state.Trie, accumulates LeafOps
during block execution and flushes to NOMT engine on Hash()/Commit()
Key design choices:
- Single flat keyspace: accounts use keccak256(addr), storage uses
keccak256(keccak256(addr) || keccak256(slot)) as 256-bit trie paths
- OpenStorageTrie returns the account trie itself (no separate tries)
- Flat state (account/storage values) stored in ethdb with prefixed keys
- NOMT trie stores only hashes; reads delegate to ethdb flat state
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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