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d2e9264119
Fourth review pass, on a hole the previous commit opened. Making a nil ubiquity token mean "unresolved" fixed the shared-local-scope collision, but left a scope resolved from CloudKit alone with nothing local to watch: with iCloud Drive off the token stays nil across a switch from account A to B, so NSUbiquityIdentityDidChange never fires and the scope kept pointing at A - and its retained credentials with it - until relaunch. Two additions. CKAccountChanged is now observed alongside the ubiquity notification, and a tokenless scope is dropped outright when either fires because there is no fingerprint to re-derive it from. Foreground activation also revalidates a tokenless scope against CloudKit, covering a switch whose notification never arrived; it compares before replacing so the common case never blanks out credentials, and an unreachable account leaves the scope standing rather than flapping on every transient failure. A token-derived scope is untouched by all of this - it changes only via the notification, and a test pins that down.