feat: add candidate FreeCAD naming SDK and attachment oracles

Build and verify the candidate-only FreeCAD naming bridge and OCCT worker path, including three-stage StringHasher restoration. Add Datum, ShapeBinder, attachment-mode, and PartDesign structure oracles plus offline SDK build plans and CI boundary checks.

native/freecad-naming-probe/shims/App/Application.h

@@ -0,0 +1,41 @@
+#ifndef SRC_APP_APPLICATION_H_
+#define SRC_APP_APPLICATION_H_
+
+#include <set>
+#include <string>
+
+namespace App {
+
+class Document;
+
+class ProbeSignal
+{
+public:
+    template<typename Callback>
+    void connect(Callback&&)
+    {}
+};
+
+class Application
+{
+public:
+    Document* getActiveDocument() const
+    {
+        return nullptr;
+    }
+
+    ProbeSignal signalStartSaveDocument;
+    ProbeSignal signalFinishSaveDocument;
+    ProbeSignal signalStartRestoreDocument;
+    ProbeSignal signalFinishRestoreDocument;
+};
+
+inline Application& GetApplication()
+{
+    static Application application;
+    return application;
+}
+
+}  // namespace App
+
+#endif