fix(3d): unified conveyorNetwork, physical B receiver, C/D containment, belt sync, real STL

src/data/modelAssets.test.ts

@@ -53,6 +53,34 @@ describe('modelAssets', () => {
     });
   });
 
+  describe('demo STL coverage', () => {
+    it('uses real STL for every available demo model', () => {
+      const stlMap: Record<string, string> = {
+        'SKU-001': '/models/box-300.stl',
+        'SKU-002': '/models/lunchbox.stl',
+        'SKU-004': '/models/box-400.stl',
+        'SKU-006': '/models/plate.stl',
+        'SKU-007': '/models/bottle.stl',
+        'SKU-008': '/models/cylinder.stl',
+        'SKU-011': '/models/cylinder.stl', // c_priority round item
+      };
+      for (const [id, path] of Object.entries(stlMap)) {
+        const asset = getModelAsset(id);
+        expect(asset?.loaderType).toBe('stl');
+        expect(asset?.frontendAssetPath).toBe(path);
+      }
+    });
+
+    it('keeps fallbacks explicit and only for heavy/missing STL', () => {
+      const fallbackIds = ['SKU-003', 'SKU-005', 'SKU-009', 'SKU-010'];
+      for (const id of fallbackIds) {
+        const asset = getModelAsset(id);
+        expect(asset?.loaderType).toBe('procedural');
+        expect(asset?.notes).toBeTruthy();
+      }
+    });
+  });
+
   describe('getModelAsset', () => {
     it('should return asset for valid item ID', () => {
       const asset = getModelAsset('SKU-006');

src/data/modelAssets.ts

@@ -158,11 +158,11 @@ export const MODEL_ASSETS: ModelAsset[] = [
     displayName: 'Oversized round',
     categoryScenario: 'C',
     dimensions: { width: 500, depth: 300, height: 300 },
-    sourceFile: 'N/A',
-    frontendAssetPath: undefined,
-    loaderType: 'procedural',
+    sourceFile: 'input_info/extracted/Stl/Цилиндр.stl',
+    frontendAssetPath: '/models/cylinder.stl',
+    loaderType: 'stl',
     fallbackPrimitive: 'cylinder',
-    notes: 'No STL available for oversized round, using procedural cylinder.',
+    notes: 'Uses available round STL (cylinder.stl, 106 KB) for the oversized-round C-priority case.',
   },
 ];