v3.10.2-debank-1
Upstream OffchainLabs/nitro v3.10.2 merged into debank (PR #24; geth submodule via Chaintable/go-ethereum-arb#22).
- Backup-writer sync verification: PASS (six checks, blockhash sample 20/20 match vs prod writer) — docs/debank/merge-v3.10.2.md
- No pipeline collection impact; no new downstream fields