openai/gpt-chat-latest → B (4:1)

Side B performs a substantial architectural migration: it replaces many individual REST endpoints with a unified RPC API, refactors the CLI to use it, introduces room-scoped operations and room/thread separation in events and the reducer, and updates tests and data structures throughout to support the new model. Side A is a well-targeted improvement to pair selection heuristics—adding smarter bridge prioritization, rank-based refinement ordering, and corresponding tests—but its impact is confined to one algorithm, whereas Side B establishes a broader, lasting platform redesign.