Bug fixes:
- blockchain.go: propagate crossValidation error (was silently discarded)
- stateupdate.go: guard secondaryHashes in ToTracingUpdate — error for
merkle when address is missing, use EmptyRootHash for bintrie (which
has no per-account storage sub-tries)
- statedb.go: use copied slot for rlp.Split instead of double it.Slot()
- disklayer.go: propagate hasher error in node() instead of discarding
Error propagation & observability:
- flat_codec_bintrie.go: log.Error on corrupt stem blob in Read paths
- generate_bintrie.go: flushStem returns error on mergeStemBlob failure
instead of falling back to partial data
- flat_codec.go, flat_codec_bintrie.go: use []byte{} instead of nil for
cache deletes to ensure fastcache stores "confirmed absent" markers
Comment & naming cleanup:
- Rename warpBinTrie to wrapBinTrie (consistent with constructor)
- Fix stale comments (ReadStorage, AccountKey doc, SplitMarker doc)
- Remove dangling BINTRIE_FLAT_STATE_REORG_GAP.md references
- Remove internal review labels (A1, A2, A4 references)
- Fix bintrie comments using merkle terminology
- Mark ProveAccount/ProveStorage as unimplemented stubs
8f15ed3a36