IV.D312 — Lemniscate three-fold

The three-fold lemniscate structure consists of Lobe B (first S^1, generated by gamma, carrying pure chi_+ character), Lobe C (second S^1, generated by eta, carrying pure chi_- character), and crossing point sigma where the bipolar structure provides a natural Z/3Z grading at angles 0, 2pi/3, 4pi/3.