openai/gpt-chat-latest → B (5:2)

Side B performs a substantial architectural refactor by moving canonical path normalization and URL construction into a shared `slug_types::paths` module, replacing ad hoc string helpers with strongly typed `GardenItemUrl`, `ForumThreadUrl`, and related types across the API and shared data structures. Side A mainly improves the local development workflow by switching the fixture runner to `cargo watch` with persistent fixture data and preferred ports, which is useful but primarily affects developer iteration rather than the project's long-term design.