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

Side A removes a small demo feature and adds a real, non-trivial improvement (async settlement worker + cached ranking scores) that fixes a legitimate concurrency/performance concern, but is scoped narrowly. Side B is a broader, more substantial refactor introducing shared, tested room-route encoding logic (room_route_segment/room_id_from_route_segment) that fixes duplicated/error-prone split_once logic across many call sites, plus adds URL normalization (YouTube canonicalization, query sorting) with extensive test coverage, providing more consistent, reusable, and better-tested infrastructure across the codebase.