openai/gpt-chat-latest → A (3:2)

Side A replaces the URL canonicalization architecture, removing the old rule-combinator engine in favor of a semantic graph/parser split and routing all public APIs (`canonicalize_raw`, breadcrumbs, parent lookup) through the new graph, which is a substantive design change affecting core behavior. Side B mainly consolidates duplicated integration-test utilities into shared helpers (`test.common`/`test.oauth`), adds HTTP timeouts, and refactors test code for reuse, improving maintainability but leaving production functionality largely unchanged.