chore: preserve approved MITC4 tolerance experiment baseline

src/fesa/elements/nonlinear_mitc4_shell.cpp

@@ -1155,11 +1155,10 @@ Jet PhysicalEnergy(const std::array<Vector3, kNodeCount>& coordinates,
   return energy;
 }
 
-/// @brief Computes a fixed-iteration analytic polar factor for drill
-/// corotation.
+/// @brief Applies one polar iteration for drill corotation.
 JetMatrix3 PolarRotation(const JetMatrix3& deformation) {
   JetMatrix3 result = deformation;
-  for (std::size_t iteration = 0U; iteration < 12U; ++iteration) {
+  for (std::size_t iteration = 0U; iteration < 1U; ++iteration) {
     const JetMatrix3 coefficients = Transpose(result);
     Matrix primal{3, 3};
     for (std::size_t row = 0; row < 3; ++row)