Firebase for Kotlin Multiplatform — Analytics + Crashlytics with a single in-library setup surface (FirebaseKit.initialize + Android auto-init). GitLive Firebase Analytics on 10 targets (Measurement-Protocol HTTP fallback on the rest) and GitLive Crashlytics on 6 targets, with an AI-feedable structured CrashReport fallback (Kermit) everywhere else. Interface + Stub/NoOp/Test variants across all 15 supported KMP targets.