openai/gpt-chat-latest → B (3:2)

Side B fixes a significant security issue by introducing HTML sanitization with the `ammonia` library and routing all Reddit `body_html` rendering through `entity_body_html`, preventing untrusted `selftext_html` from executing scripts while preserving benign markup with tests. Side A improves Reddit child import behavior by attaching imported posts directly under the subreddit and displaying child titles correctly, plus expands integration tests, but those are primarily functional correctness and UX improvements rather than a cross-cutting security hardening.