openai/gpt-chat-latest → A (5:1)

Side A replaces many ad hoc REST endpoints with a unified RPC batch API, restructures the CLI around scoped public/private rooms, introduces room-aware routing in events and the reducer, and factors ingest validation into a reusable module. Although it is a large refactor, it establishes a lasting architectural foundation and migrates existing functionality, whereas Side B is a focused improvement that makes feed catch-up stable under timestamp collisions and permission-aware by anchoring to durable ingest order and adding targeted tests.