feat(thermal): publish fully validated HDF5 histories atomically

src/fesa/io/hdf5/hdf5_model_writer.h

@@ -8,6 +8,9 @@
 
 namespace fesa::hdf5_internal {
 
+/// @brief Writes every Domain node preserving its source identity.
+void WriteNodes(hid_t file, const Domain& domain);
+
 /// @brief Writes metadata and exact model/source identity datasets.
 void WriteModel(hid_t file, const Domain& domain,
                 const WriterModelData& model_data);