openai/gpt-chat-latest → A (4:1)

Side A delivers substantive parser and rendering improvements: it introduces deterministic typed block masking, a prose tokenizer that correctly recognizes item references while avoiding code fences, enforces braced DSL bodies instead of ambiguous fenced blocks, fixes URL tokenization at line boundaries, and updates HTML linkification to support raw URLs and external references with thorough tests. Side B mainly restructures URL canonicalization around a new rules engine and updates many call sites and tests to use `https://` canonical IDs, but much of the patch is migration and infrastructure churn compared with the concrete parsing and correctness fixes in Side A.