openai/gpt-5.2-chat → A (9:1)

Side A introduces a full invite system (RoomMintInvite, /join/:token flow, redemption applying GrantAdded events), RoomAudit RPC, timeline merging with ThreadItem::System, reducer support for invites, and comprehensive integration tests (test/invites.bb), significantly expanding core auth and room capabilities. Side B is a focused UI enhancement making ranked child group pin icons clickable to unpin, with CSS tweaks and a browser test, but does not alter core domain logic.