triedb: add native namespace state delta commit path

[zander-xyz]

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[zander-xyz]

@claude review

[Copilot]

Pull request overview

This PR extends the monad::Db interface with a native “namespace-scoped state delta commit” operation and wires it through the primary DB implementations, statesync server context, and migration dual-write path. It also adds an end-to-end test that validates which encoding (slot vs page) is considered canonical for namespace state roots across the migration fork boundary.

Changes:

• Add Db::commit_namespace_state_deltas(...) as a required virtual API and implement/override it across TrieDb, PartialTrieDb, TrieRODb, and monad_statesync_server_context.
• Introduce commit_native_namespace_state_deltas<Traits>(...) in the migration commit path to dual-write namespace deltas and return the canonical encoding’s roots depending on traits::mip_8_active().
• Add a migration test asserting namespace state root canonicalization pre-/post-fork while ensuring both DBs maintain consistent readable namespace state.

Verdict: CORRECT

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
category/execution/ethereum/db/db.hpp	Adds the new pure-virtual commit_namespace_state_deltas API to the core DB interface.
category/execution/ethereum/db/trie_db.hpp	Marks TrieDb::commit_namespace_state_deltas as an override of the new interface method.
category/execution/ethereum/db/trie_rodb.hpp	Adds an aborting override for namespace commits on the read-only DB wrapper.
category/execution/ethereum/db/partial_trie_db.hpp	Declares the new override in the witness/partial DB implementation.
category/execution/ethereum/db/partial_trie_db.cpp	Implements the override as a no-op (asserting deltas are empty) for witness contexts.
category/statesync/statesync_server_context.hpp	Extends the statesync server DB context to override the new interface method.
category/statesync/statesync_server_context.cpp	Delegates namespace-delta commits to the underlying read-write TrieDb.
category/execution/monad/db/commit_block_migration.hpp	Declares commit_native_namespace_state_deltas for the migration dual-write path.
category/execution/monad/db/commit_block_migration.cpp	Implements commit_native_namespace_state_deltas and explicitly instantiates it for Monad traits.
category/execution/monad/db/test_page_storage_migration.cpp	Adds an end-to-end test validating canonical namespace root selection across the migration fork boundary.

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[github-actions]

Reviewed the diff. The new commit_native_namespace_state_deltas mirrors commit_block's dual-write structure closely: the same is_page_encoded/mip_8_active invariant assertions, canonical-first ordering, and single-db/dual-db split. The pure-virtual commit_namespace_state_deltas on Db is properly overridden in TrieDb, PartialTrieDb (asserts empty, since witnesses don't carry namespace state), TrieRODb (aborts), and monad_statesync_server_context (forwards to rw). Trait instantiation via EXPLICIT_MONAD_TRAITS is correct.

A couple of observations that didn't rise to inline findings:

• The canonical-first ordering in the dual-write path is stricter than needed — unlike commit_block, there's no populate_header_fn reading from the canonical db, so either order would produce the same roots. Matching commit_block's pattern is fine for consistency, but a one-line comment would save a future reader some head-scratching about "why does the order matter here."
• monad_statesync_server_context::commit calls on_commit(...) before forwarding to record proposed deletions for statesync clients; commit_namespace_state_deltas does not. Given Deletion has no namespace field, namespace-aware statesync is clearly follow-up work, but worth tracking so it doesn't get lost.

Verdict: CORRECT

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