The WelcomeView gate was the visible surface bug, but the same createMemberFromOAuth path could still be reached if a returning user's Supabase session expired and they re-signed in without an invite. The discipline here: fix the surface bug in one commit, explicitly name the architectural follow-up (the planned InvitationGateView for the post-sign-in path), and refuse to silently expand scope. Ship the slice; queue the rest as a labeled follow-up so it doesn't get lost or buried.
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