openai/gpt-5.3-chat → A (9:1)

A introduces substantive parsing and correctness improvements: deterministic block tokens replacing RNG, typed block tracking, a new prose tokenizer that avoids code fences and trims punctuation, and stricter validation requiring braced item bodies—plus integrating this into linkification. B mainly removes a wrapper div and tweaks CSS/layout, with no comparable impact on core logic or correctness.