Shared library observability hook interface + 3 default Google/Firebase hook implementations (Crashlytics attribution / Analytics health / Performance traces) for Kotlin Multiplatform. Per RULE-LIB-OBSERVABILITY-SURFACE-001.

Reactive network connectivity monitoring for Kotlin Multiplatform — StateFlow-based, all 21 KMP targets

Koin companion for cmp-observe — zero-config DI registration of LibraryObservationHook instances for Kotlin Multiplatform.