refactor(mobile): enforce result model invariants #1705

Job	Run time
android-eligibility / decide / decide	4s
android-device-tests (wallet-mobile)	4m 16s
android-device-tests (compose-demo)	4m 15s
android-device-tests (enterprise-mobile)	7m 13s
android-device-tests	4s
	15m 52s

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