openai/gpt-chat-latest → A (5:1)

Side A introduces substantial product functionality: GitHub OAuth login, session management, pseudonym claiming, vote authorization, new identity events (`PrincipalCreated`, `OauthLinked`, `PseudonymClaimed`), projection logic, storage schema changes, routing, and integration tests. Although it also moves the `durable` crate out of the workspace, the lasting value comes from the new authentication and identity architecture, whereas Side B primarily adds an offline developer tool (`sorterc`) for compiling `.sorter` files and linting JSONL event logs without changing the core application behavior.