openai/gpt-chat-latest → B (4:3)

Side B makes the offline tooling substantially more useful and efficient by changing `scan_jsonl` to a fast parse-only pass, surfacing detailed DSL `parse_error` information, adding `compile --ingest` to replay state up to a single event, improving CLI behavior, and adding a regression test. Side A adds important infrastructure (Dockerfile/Fly config) plus new `EventLog` and `ViewStore` modules, but much of it is deployment support or isolated new utilities, whereas Side B directly improves core developer workflows and diagnostics with targeted functional changes.