Primitive cell (20 atoms), relaxed with Orb v3. Built by substitution from the Hf₈GaRh₁₁ prototype (mp-3297102). New composition (not in Materials Project, Alexandria, GNoME or COD). Orb hull 19.4 meV/atom; +48.7 meV/atom above V₃Fe + VFe₃ + VFe₂Si in PBE (ABACUS, TZDP single point), nearly non-magnetic. Sun-tetragonal campaign, loop 5: the only tetragonal near-hull cell, and it does not hold up.