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

Side A introduces a genuinely new, well-tested subsystem (composable url_rules engine with per-domain canonicalization, breadcrumb/parent logic, alias detection) that fixes real bugs (e.g. phantom 'comments' breadcrumbs) and is directly tied to the documented ItemId-as-canonical-URL design, with dozens of unit tests validating behavior. Side B mixes useful dead-code removal (demo counter) with a non-trivial async settlement/batching architecture and ranking cache, but adds no tests for the new concurrency-sensitive worker, making its correctness and lasting value less certain despite the performance intent.