openai/gpt-chat-latest → A (3:2)

Side A delivers deeper tooling improvements by redesigning JSONL scanning into a fast parse-only pass, surfacing detailed DSL parse errors, and adding `compile --ingest` that reconstructs prior reducer state for single-event replay, with corresponding API changes and tests. Side B adds a useful `RoomList` RPC, CLI subcommand, response types, and integration tests for access isolation, but it is a relatively self-contained feature compared with Side A's broader performance, diagnostics, and developer workflow improvements.