embedded3 S2-7b: the curved instrument's per-wall operator probe (curved_operator_probe) and RTX_E3_CURVED_SCHEME; host prototype RTX_E3_WALL_FOOT=centroid (the shear closure's wall velocity at the foot from the open part's CENTROID, not the face centre — on a rotating wall the two feet are ½h(1−α) apart: rigid-mode probe residual 4.5× smaller, the rotating wall's offset −0.022 → ±0.002 h, its cut pressure zeroth → first order); default off, device refuses it

Co-Authored-By: Claude Fable 5.1 <[email protected]>

crates/specialized/rtx-cfd/src/solvers/incompressible/embedded3/wall.rs

@@ -119,6 +119,7 @@ pub struct Mask {
     pub(super) wall_exchange_foot: bool,
     pub(super) conv_sides_exact: bool,
     pub(super) wall_flux_true_normal: bool,
+    pub(super) wall_foot_centroid: bool,
     /// The centroid prototype's pressure-gradient weights per u / v / w face.
     /// The centroid-distance cross diffusion (S2-5).
     pub(super) diffusion_centroid: bool,
@@ -550,6 +551,7 @@ impl Mask {
             wall_exchange_foot: false,
             conv_sides_exact: false,
             wall_flux_true_normal: false,
+            wall_foot_centroid: false,
             grad_weights: None,
             diffusion_centroid: false,
             face_shifts: None,