~anthropic/claude-sonnet-latest → B (6:4)

B is a cohesive architectural refactor: it moves path canonicalization into slug-types with strongly-typed GardenItemUrl/ForumThreadUrl/TildeOntologyPath newtypes, replacing scattered string-based helpers across the whole API surface with correct-by-construction types, improving long-term maintainability. A mixes a legitimate room-URL refactor (dropping the slash between short/slug) with a large speculative addition of YouTube-specific URL normalization and extensive url::Url identity documentation tests that are tangential to the stated 'url refactor' goal, diluting its focus and adding untested-in-practice heuristic logic.