openai/gpt-5.2-chat → A (9:1)

Side A makes a substantive storage design change: replacing a write-time-capped `Deque` with an append-only `List`, removing `trim_recent_votes`, bumping the schema version, shifting the cap to query-time in `build_group_state`, and adding a test to verify the new behavior. Side B merely removes `data-check-*` attributes from a form tag, a minor HTML simplification with limited architectural impact.