fix(equation-and-linear-solve): address review findings

tests/unit/solvers/linear/pardiso_linear_solver_test.cpp

@@ -6,12 +6,18 @@
 #include <cstdint>
 #include <span>
 #include <string_view>
+#include <type_traits>
 #include <vector>
 
 #include <gtest/gtest.h>
 
 namespace {
 
+static_assert(
+    !std::is_copy_constructible_v<fesa::PardisoLinearSolver>);
+static_assert(
+    !std::is_copy_assignable_v<fesa::PardisoLinearSolver>);
+
 fesa::SymmetricCsr spd_matrix() {
     return {
         3,