openai/gpt-chat-latest → B (4:1)

Side B makes a substantive type-safety refactor by changing `resolve_item` to return `CanonicalItemUrl`, propagating canonical path types through validation, ranking, pair selection, and RPC code, and adding `Deref<Target=str>` plus `from_stored` usage to reduce string conversions and parsing errors. Side A primarily removes the duplicate `server/src/html/forum.rs` and establishes `forum/mod.rs` as the sole module root—a useful structural cleanup that resolves module ambiguity, but it largely reorganizes existing code rather than strengthening core behavior.