완성된 HHT trial의 constraint 자료 중복 평가 제거

src/fesa/math/dense_blas_internal.cpp

@@ -40,6 +40,11 @@ ScopedLocalDenseThreads::~ScopedLocalDenseThreads() {
   if (restore_default_) static_cast<void>(mkl_set_num_threads_local(0));
 }
 
+LocalDensePolicy ReadScopedLocalDensePolicy() noexcept {
+  const ScopedLocalDenseThreads scope{};
+  return {mkl_domain_get_max_threads(MKL_DOMAIN_BLAS), mkl_get_dynamic()};
+}
+
 bool CholeskyLowerAndInverse(const Matrix& matrix, Matrix& lower,
                              Matrix& inverse_lower, CholeskyFailure* failure) {
   if (failure != nullptr) *failure = CholeskyFailure::kNone;

src/fesa/math/dense_blas_internal.h

@@ -1,10 +1,10 @@
 #ifndef FESA_SRC_FESA_MATH_DENSE_BLAS_INTERNAL_H_
 #define FESA_SRC_FESA_MATH_DENSE_BLAS_INTERNAL_H_
 
-#include <mkl.h>
-
 #include <cstddef>
 
+#include <mkl.h>
+
 #include "fesa/core/status.h"
 #include "fesa/math/matrix.h"
 #include "fesa/math/vector.h"
@@ -40,6 +40,16 @@ class ScopedLocalDenseThreads {
   bool restore_default_{false};
 };
 
+/// @brief Records requested backend policy, without claiming actual threads.
+struct LocalDensePolicy {
+  int blas_max_threads;
+  int dynamic;
+};
+
+/// @brief Reads BLAS policy inside the same restored scope as local elements.
+/// @note No process-wide policy is changed; positive caller TLS is retained.
+LocalDensePolicy ReadScopedLocalDensePolicy() noexcept;
+
 /// @brief Converts a dense storage length to the private MKL integer type.
 /// @return The converted length or an uncategorized overflow failure.
 Result<MKL_INT> ToMklSize(std::size_t size);