openai/gpt-chat-latest → A (5:1)

Side A replaces many individual REST endpoints with a unified RPC batch interface (`/api/v0/rpc`), updates the CLI to use it, introduces room-scoped commands (`public`/`private`), and restructures reducer/events to separate rooms from forum threads (`room_id` plus `thread_tag`), which is a substantial architectural change touching client, server, tests, and data model. Side B is a useful cleanup that extracts canonicalization/identity parsing into dedicated modules and enforces stored-form identities without `@`, but it is primarily a refactor and validation improvement rather than introducing comparable new project capabilities.