town.chalky.config

A user's chalky.town configuration, stored once at rkey `self` in whichever store its own `dataMode` names — the author's PDS repo in public mode, chalky.town's private per-DID store in private mode. So the record declaring a private preference is itself private, and nothing about the author's settings is world-readable when they asked for privacy. Read right after sign-in (both stores are checked, since the mode isn't known until the record is found) to route task data and to restore theme/preferences across devices. Two copies can only coexist if a mode switch was interrupted; `updatedAt` resolves that, and the loser is deleted.