openai/gpt-chat-latest → A (4:1)

Side A introduces substantial code organization by extracting forum functionality into dedicated modules (`access.rs`, `ingest.rs`, `nav.rs`, `new_thread.rs`, `room_members.rs`) and adds a reusable `sample-fixture` debugging tool integrated into the build tasks. Although some changes inline helper calls, the commit creates reusable navigation, access-control, rendering, and composition components that support future development, whereas Side B is limited to documentation updates aligning identity and wire-format conventions without changing project behavior.