Refactor partial state filter from DB skip markers to direct filter
checks via shouldSyncStorage()/shouldSyncCode(), avoiding stale marker
issues across sync cycles.
Additional fixes:
- Skip WriteAccountSnapshot/WriteStorageSnapshot in partial mode
(forwardAccountTask, processStorageResponse, onHealState)
- Guard against negative ETA in reportSyncProgress when sync restarts
with persisted progress counters
- Add break after forwardAccountTask in cleanStorageTasks to prevent
nil pointer when task.res is cleared
- Add diagnostic log in assignAccountTasks when no idle peers available
Comprehensive integration tests using mock peers that verify partial
sync behavior end-to-end:
- TestPartialSyncIntegration: Full sync with 20 accounts, 2 tracked
- TestPartialSyncAllAccounts: Verifies complete account trie synced
- TestPartialSyncSkipMarkers: Verifies skip markers written correctly
- TestPartialSyncNoStorageForUntracked: No storage for skipped accounts
- TestPartialSyncRequestCount: Diagnostic showing request filtering
- TestPartialSyncVsFullSync: Compares full vs partial, shows 83% reduction
Level 2 validation was also performed using a two-node local devnet
(full node + partial node) to verify database size reduction and
correct RPC responses. The mock peer tests provide equivalent coverage
with faster execution and CI compatibility.
Part of partial statefulness Phase 2.
