build(python): gridfire uses fourdst wheel in python mode

src/lib/engine/scratchpads/engine_multiscale_scratchpad.cpp

@@ -0,0 +1,52 @@
+#include "gridfire/engine/views/engine_multiscale.h"
+#include "gridfire/engine/scratchpads/scratchpad_abstract.h"
+#include "gridfire/engine/scratchpads/types.h"
+#include "gridfire/engine/scratchpads/engine_multiscale_scratchpad.h"
+
+#include "fourdst/atomic/atomicSpecies.h"
+
+#include <vector>
+#include <memory>
+#include <unordered_map>
+
+#include "sundials/sundials_context.h"
+
+
+namespace gridfire::engine::scratch {
+     bool MultiscalePartitioningEngineViewScratchPad::is_initialized() const{ return has_initialized; }
+
+     void MultiscalePartitioningEngineViewScratchPad::initialize() {
+          if (has_initialized) return;
+
+          const int flag = SUNContext_Create(SUN_COMM_NULL, &sun_ctx);
+          if (flag != 0) {
+               throw std::runtime_error("Failed to create SUNContext in MultiscalePartitioningEngineViewScratchPad.");
+          }
+
+          has_initialized = true;
+     }
+
+     MultiscalePartitioningEngineViewScratchPad::~MultiscalePartitioningEngineViewScratchPad() {
+          qse_solvers.clear();
+          if (sun_ctx != nullptr) {
+               SUNContext_Free(&sun_ctx);
+               sun_ctx = nullptr;
+          }
+     }
+
+     std::unique_ptr<AbstractScratchPad> MultiscalePartitioningEngineViewScratchPad::clone() const {
+          auto clone_pad = std::make_unique<MultiscalePartitioningEngineViewScratchPad>();
+          clone_pad->qse_groups = this->qse_groups;
+          clone_pad->dynamic_species = this->dynamic_species;
+          clone_pad->algebraic_species = this->algebraic_species;
+          clone_pad->composition_cache = this->composition_cache;
+
+          clone_pad->initialize();
+          clone_pad->qse_solvers.reserve(this->qse_solvers.size());
+          for (const auto& solver : qse_solvers) {
+               clone_pad->qse_solvers.push_back(solver->clone(clone_pad->sun_ctx)); // Must rebind context to new SUNContext
+          }
+          return clone_pad;
+     }
+
+}