fix: phase 8 refactoring

tests/engine/MetaEngine.test.ts

@@ -372,6 +372,21 @@ describe('MetaEngine', () => {
       const categories = await metaEngine.collectCategoriesFromPosts();
       expect(categories).toEqual(['valid-cat']);
     });
+
+    it('should ignore empty and whitespace-only taxonomy entries from posts', async () => {
+      mockPosts = [
+        {
+          tags: JSON.stringify([' valid-tag ', '', '   ']),
+          categories: JSON.stringify([' valid-cat ', '', '   ']),
+        },
+      ];
+
+      const tags = await metaEngine.collectTagsFromPosts();
+      const categories = await metaEngine.collectCategoriesFromPosts();
+
+      expect(tags).toEqual(['valid-tag']);
+      expect(categories).toEqual(['valid-cat']);
+    });
   });
 
   describe('Event Emission', () => {

tests/engine/TagEngine.test.ts

@@ -634,6 +634,18 @@ describe('TagEngine', () => {
 
       expect(result.discovered).toBeGreaterThanOrEqual(0);
     });
+
+    it('should ignore empty and whitespace-only tags discovered from posts', async () => {
+      mockSelectDataQueue = [
+        [{ tags: '[" valid-tag ", "", "   "]' }],
+        [],
+      ];
+
+      const result = await tagEngine.syncTagsFromPosts();
+
+      expect(result.discovered).toBe(1);
+      expect(result.added).toEqual(['valid-tag']);
+    });
   });
 
   describe('loadTagsFromFile', () => {