Applies the REV2 architecture redesign in docs/isucon-arch/DESIGN-REV2.md to the isunarabe-train-2026 (nrb2026) implementation. REV2 is layered on top of REV1 (applying-isucon-arch-isunarabe) — REV1 must already be merged. Use when the REV1 dispatcher is…
Source text: Japanese