openai/gpt-chat-latest → B (50:1)

Side B performs a substantial architectural refactor by introducing a first-class `ItemId` type, extracting item normalization into `item_wire`, and migrating reducer, ranking, routing, RPC, validation, HTML, and tests away from `CanonicalItemUrl`. This changes the project's core identity model and link-generation APIs with broad, lasting impact, whereas Side A only moves the placement of the `div id=(ERRORS_ID)` within the HTML form without changing functionality.