openai/gpt-chat-latest → A (3:2)

Side A consolidates canonicalization, path normalization, and room-aware URL generation into a shared `types::paths` module, replacing scattered string helpers with strongly typed `GardenItemUrl`, `ForumThreadUrl`, and `TildeOntologyPath` throughout RPCs and API types. This removes duplicated logic, makes wire formats correct-by-construction across many interfaces, and centralizes core path semantics, whereas Side B adds a useful developer-only offline compiler/linter (`sorterc`) without changing the project's core runtime design.