~anthropic/claude-sonnet-latest → A (3:1)

Side A introduces a substantive architectural artifact (RouteContext wrapper plus a detailed migration plan for ItemId/routing) that guides real future refactoring work, even if incomplete. Side B is almost entirely mechanical rustfmt/tooling churn (reformatting durable/* examples and tests, toolchain pinning, vscode settings) with only a trivial CSS dedup and no functional improvement, offering little lasting design value beyond formatting consistency.