IV.D50 — CR-Structure on τ³

The CR-structure on τ³ is the triple (H, J, ν): H = fiber tangent T² (spanned by ∂/∂θ_γ, ∂/∂θ_η), J rotates within H (J² = -id), ν = base direction ∂/∂t. CR-type (1,1): one complex dimension, one real codimension.