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

B introduces a coherent room-route encoding abstraction (room_route_segment/room_id_from_route_segment), consistently applies it across server routes, tests, and Clojure fixtures, and adds real URL-normalization logic (YouTube canonicalization, query sorting) with substantial unit tests, delivering concrete bugfixes/consistency improvements. A adds a new UI action/template system which is architecturally interesting but is more speculative plumbing (new form-template DSL, ui_html endpoint) without the breadth of test coverage or demonstrated end-to-end correctness that B shows across many call sites.