IGPAPI
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    Variable BindFamilyDeviceIdConst

    BindFamilyDeviceId: Effect<void, never, MobileSession> = ...

    The app bound the device family id to its FX/switcher session. Emit it at the point of the flow where the capture flips: the first session-start switcher probes (FxIgXavSwitcherBadgingDataQuery) carry an empty family_device_id, the later ones the device family id. No captured response binds it, so the flow marks the transition where the capture's requests change.