docs(thermal): clarify shared dof pattern contract

include/fesa/fem/dof_manager.h

@@ -16,9 +16,10 @@ namespace fesa {
 
 class DofManagerTestAccess;
 
+/// @brief Distinguishes structural six-component and thermal five-station maps.
 enum class DofProfile { kStructural, kThermal };
 
-/// @brief Stores the stable structural CSR pattern.
+/// @brief Stores the stable full-space CSR pattern.
 struct SparsePattern {
   std::vector<std::size_t> row_offsets;
   std::vector<std::size_t> column_indices;
@@ -91,7 +92,7 @@ class DofManager {
   const std::vector<std::size_t>& ConstrainedDofs() const noexcept;
   /// @brief Returns dc in constrained-DOF order.
   const Vector& PrescribedValues() const noexcept;
-  /// @brief Returns the full-space structural CSR pattern.
+  /// @brief Returns the full-space CSR pattern for the active profile.
   const SparsePattern& GetSparsePattern() const noexcept;
   /// @brief Validates the complete owner-issued equation and pattern mapping.
   Status ValidateInvariants() const;