openai/gpt-chat-latest → A (5:2)

Side A resolves a real module-structure issue by removing the duplicate `server/src/html/forum.rs`, adding `forum/mod.rs`, and making `forum/` the single module root while preserving behavior through extracted modules like `feed.rs`, `views.rs`, and `thread_morph.rs`. Side B replaces the URL canonicalization engine with a new graph-based architecture and updates the registry API, but the visible patch largely swaps implementations and removes in-file tests without showing the new core logic, making its lasting functional impact less directly evident from the diff.