fix(poly): phi boundary values now coorespond to theta flux through polytrope surface

src/poly/utils/private/integrators.cpp

@@ -97,6 +97,8 @@ namespace polyMFEMUtils {
           }
 
           // Calculate the Jacobian
+
+          // TODO: Check for when theta ~ 0?
           const double u_safe = std::max(u_val, 0.0);
           const double d_u_nl = m_polytropicIndex * std::pow(u_safe, m_polytropicIndex - 1);
           const double x2_d_u_nl = d_u_nl;