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

Side A is pure file reorganization (splitting a monolith into modules) with no behavioral change, which has value but is mechanical churn. Side B introduces a real type-safety improvement by threading CanonicalItemUrl through resolve_item, validate, and rank computations instead of raw strings, reducing stringly-typed bugs, plus adds Deref impls that reduce boilerplate call sites—this is a more substantive, lasting design improvement to the codebase's type system.