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

Side A is a substantive code refactor of the URL canonicalization engine—removing the old combinator-based engine.rs and rewiring registry.rs to a new graph/parse-based architecture, with documentation updated to match—representing real, functional lasting change to core logic. Side B is purely documentation/plan-file alignment (removing @ syntax from prose docs) with no code changes, which is useful for coordination but has less durable engineering value than an actual module refactor.