openai/gpt-5.2-chat → A (10:1)

Side A introduces a full invite system end-to-end: new RPC commands (RoomMintInvite, RoomAudit), server routes (/join/:token), OAuth redemption flow integration, reducer state extensions, new event types, CLI commands, timeline merging, and comprehensive integration tests. It significantly expands backend capabilities, data models, and test coverage. Side B is a focused UI improvement making pin icons clickable to unpin, with corresponding CSS and browser test updates. While useful, it is comparatively small in scope and impact.