openai/gpt-chat-latest → A (5:1)

Side A introduces a substantially richer URL canonicalization architecture: a graph-based traversal engine with declarative graph builder, parsing layer, generic fallback, breadcrumb generation, context-aware canonicalization for Reddit and YouTube, and extensive validation/tests. Side B mainly integrates URL canonicalization into the wider codebase and migrates IDs to full HTTPS URLs, but much of its functional value depends on the underlying URL rules that Side A implements.