R8-c: drop zero summands from cut_wall_loads; extrapolation diagnostics beyond FAR_OUTSIDE with the worst point

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

crates/specialized/rtx-cfd/tests/embedded3_flag_wake.rs

@@ -26,8 +26,8 @@ use embedded3_flag_kinematics::{Recorded, recorded};
 use rtx_cfd::solvers::incompressible::ConvectionScheme;
 use rtx_cfd::solvers::incompressible::embedded3::step::device::DeviceStep;
 use rtx_cfd::solvers::incompressible::embedded3::{
-    Body, Boundaries, DeviceSdf, Field, Fluid, Grid, HexPlate, Parameters, PlateSurface, Side,
-    Solver, WallScheme, write_vtk,
+    Body, Boundaries, DeviceSdf, FAR_OUTSIDE, Field, Fluid, Grid, HexPlate, Parameters,
+    PlateSurface, Side, Solver, WallScheme, write_vtk,
 };
 use std::io::Write as _;
 
@@ -735,7 +735,7 @@ fn flag_wake_on_the_device() {
                 let extrap_share = tr.extrapolated_load / abs_f.max(1e-300);
                 let ms = lap.elapsed().as_secs_f64() * 1e3;
                 println!(
-                    "  transfer t {t:.4}: {} loads ({} flag); route − Σ {:.1e} N; flag F {:+.4} {:+.4} {:+.4} N, M {:+.5} {:+.5} {:+.5} N m; |ΔF|/Σ|F| {rel_f:.1e}, |ΔM|/(Σ|F| L) {rel_m:.1e}; Newton ≤ {:.1e} m, outside ≤ {:.2e} ({} extrapolated, {:.1e} of Σ|F|), interior share {:.3}; {ms:.0} ms",
+                    "  transfer t {t:.4}: {} loads ({} flag); route − Σ {:.1e} N; flag F {:+.4} {:+.4} {:+.4} N, M {:+.5} {:+.5} {:+.5} N m; |ΔF|/Σ|F| {rel_f:.1e}, |ΔM|/(Σ|F| L) {rel_m:.1e}; Newton ≤ {:.1e} m, outside ≤ {:.2e} at ({:.4}, {:.4}, {:.4}) ({} beyond {FAR_OUTSIDE}, {:.1e} of Σ|F|), interior share {:.3}; {ms:.0} ms",
                     loads.len(),
                     flag.len(),
                     nrm([route[0] - sum[0], route[1] - sum[1], route[2] - sum[2]]),
@@ -747,6 +747,9 @@ fn flag_wake_on_the_device() {
                     tr.moment_in[2],
                     tr.max_residual,
                     tr.max_outside,
+                    tr.worst_point[0],
+                    tr.worst_point[1],
+                    tr.worst_point[2],
                     tr.extrapolated,
                     extrap_share,
                     tr.interior_share