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

B performs a genuine architectural improvement: moving path/URL logic into slug-types as typed newtypes (GardenItemUrl, ForumThreadUrl, TildeOntologyPath), eliminating stringly-typed helpers and duplicated normalization code across server and shared types, with preserved tests. A adds a new /ui endpoint and a JSON-template form-filling mechanism, which is useful but introduces more speculative complexity (a new DSL-like templating system with security caveats) without clear necessity or broad reuse yet. B's refactor reduces duplication and strengthens type safety across the whole API surface, providing more durable value than A's single new feature endpoint.