Case C-824/24: Judgment of the Court (Seventh Chamber) of 26 February 2026 – Commission v Belgium (Completion guarantee for unregistered sellers and contractors) (Failure of a Member State to fulfil obligations – Directive 2006/123/EC – Services in the internal market – Article 16 – Freedom to provide services – Article 23 – Professional liability insurance and guarantees – Obligations arising from those articles – Sale of buildings to be constructed – Imposition of a completion guarantee on unregistered contractors and sellers)