~anthropic/claude-sonnet-latest → B (65:35)

B is a substantial, well-tested refactor that moves path/URL logic into a shared slug-types crate with correct-by-construction newtypes (GardenItemUrl, ForumThreadUrl, TildeOntologyPath), reducing string-formatting duplication and improving type safety across server and DTOs, while preserving existing test coverage. A is a smaller, focused change (Deque->Vec plus dropping an eager trim in favor of a query-time cap) that is reasonable and adds a targeted test, but is narrower in scope and impact compared to B's broader architectural improvement.