openai/gpt-chat-latest → A (4:1)

Side A adds a substantial new offline tooling capability by introducing a reusable `offline` module plus a new `sorterc` workspace binary that compiles `.sorter` files, replays reducer state from JSONL, scans event logs for malformed ingests, and includes tests and documentation. Side B is a broad architectural reconfiguration toward hierarchical `ItemId`/tree-based state and UI changes, but much of it is scaffolding (placeholder Reddit fetch, renames, structural migration) whose completed value depends on later work, whereas A delivers immediately usable developer functionality built on existing server logic.