openai/gpt-chat-latest → A (10:3)

Side A introduces a substantial architectural change: it replaces many individual REST endpoints with a unified batched RPC interface, restructures the CLI around room-scoped commands, separates room and thread concepts in the event/reducer model, and updates validation, routing, tests, and data structures to support the new design. Side B fixes a real multi-user bug by removing browser sentinel delegates so browser-originated posts no longer create conflicting AgentBound entries, but it is a targeted correctness fix compared with Side A's broader, lasting platform restructuring.