Clean Costco normalization artifacts

tests/test_costco_pipeline.py

@@ -285,6 +285,47 @@ class CostcoPipelineTests(unittest.TestCase):
         self.assertEqual("true", discount["is_coupon_line"])
         self.assertEqual("false", discount["is_item"])
 
+    def test_costco_name_cleanup_removes_dual_weight_and_logistics_artifacts(self):
+        mixed_units = enrich_costco.parse_costco_item(
+            order_id="abc",
+            order_date="2026-03-12",
+            raw_path=Path("costco_output/raw/abc.json"),
+            line_no=1,
+            item={
+                "itemNumber": "18600",
+                "itemDescription01": "MANDARINS 2.27 KG / 5 LBS",
+                "itemDescription02": None,
+                "itemDepartmentNumber": 65,
+                "transDepartmentNumber": 65,
+                "unit": 1,
+                "itemIdentifier": "E",
+                "amount": 7.49,
+                "itemUnitPriceAmount": 7.49,
+            },
+        )
+        self.assertEqual("MANDARIN", mixed_units["item_name_norm"])
+        self.assertEqual("5", mixed_units["size_value"])
+        self.assertEqual("lb", mixed_units["size_unit"])
+
+        logistics = enrich_costco.parse_costco_item(
+            order_id="abc",
+            order_date="2026-03-12",
+            raw_path=Path("costco_output/raw/abc.json"),
+            line_no=2,
+            item={
+                "itemNumber": "1375005",
+                "itemDescription01": "LIFE 6'TABLE MDL #80873U - T12/H3/P36",
+                "itemDescription02": None,
+                "itemDepartmentNumber": 18,
+                "transDepartmentNumber": 18,
+                "unit": 1,
+                "itemIdentifier": "E",
+                "amount": 119.98,
+                "itemUnitPriceAmount": 119.98,
+            },
+        )
+        self.assertEqual("LIFE 6'TABLE MDL", logistics["item_name_norm"])
+
     def test_build_items_enriched_matches_discount_to_item(self):
         with tempfile.TemporaryDirectory() as tmpdir:
             raw_dir = Path(tmpdir) / "raw"