openai/gpt-5.2-chat → B (50:1)

Side B introduces an entire semantic URL canonicalization system (new graph, parser, builder, registry tests) with ~800+ lines of substantive logic and extensive tests covering Reddit/YouTube normalization, breadcrumbs, tracking stripping, and security encoding. Side A merely removes a `data-check-*` attribute block from a form in `forum.rs`, a small UI tweak with minimal architectural impact.