openai/gpt-chat-latest → A (4:1)

Side A adds HTML sanitization with the `ammonia` library and routes all rendering of Reddit `body_html` through a shared `entity_body_html` function, preventing untrusted HTML (including scripts and event handlers) from executing while adding tests for benign and malicious input. Side B fixes an ordering bug by moving the zero-ratio early return before `ensure_item` and `voted_pairs.insert`, preventing ghost items and stale voted-pair state, but its impact is narrower than the cross-cutting XSS mitigation in Side A.