openai/gpt-chat-latest → A (3:2)

Side A delivers focused, durable improvements to the offline tooling: it replaces an expensive replay-based scan with a fast parse-only pass, exposes detailed DSL parse errors, adds targeted `compile --ingest` support for replaying a single event with prior state, and includes tests and CLI/documentation updates. Side B adds substantial UI and authentication functionality (browser session cookies, room pages, posting routes), but it also includes a large non-code planning document and broad architectural churn, making the lasting value of the individual commit less concentrated than A's clear performance and debugging improvements.