Case C-776/24, Bopuis: Judgment of the Court (Sixth Chamber) of 18 December 2025 (request for a preliminary ruling from the Tribunal du travail francophone de Bruxelles – Belgium) – CJ v Service fédéral des Pensions (SFP) (Reference for a preliminary ruling – Officials – Staff Regulations of Officials of the European Union – Annex VIII – Pensions – Pension rights acquired before entry into the service of the European Union – Transfer to the pension scheme of the European Union institutions – Transfer request of the worker – Irrevocability of that transfer – Unjust enrichment)