Add first Winchester catalog product

exports/catalog-latest.json

@@ -1,7 +1,45 @@
 {
     "format": "roundcount-catalog",
     "catalog_version": 1,
-    "generated_at": "2026-07-15T16:19:54+00:00",
-    "product_count": 0,
-    "products": []
+    "generated_at": "2026-07-15T16:21:26+00:00",
+    "product_count": 1,
+    "products": [
+        {
+            "catalog_version": 1,
+            "record_uuid": "6df27dd1-240e-4af9-9307-85aad1bd6c25",
+            "upc": "020892201989",
+            "sku": "Q3131",
+            "manufacturer": "Winchester",
+            "brand": "USA",
+            "product_name": "5.56 NATO M193",
+            "caliber": "5.56 NATO",
+            "bullet": {
+                "weight_gr": 55,
+                "type": "FMJ",
+                "material": "Lead core"
+            },
+            "case": {
+                "material": "Brass",
+                "reloadable": true
+            },
+            "primer": {
+                "type": "Boxer",
+                "sealed": null
+            },
+            "package": {
+                "rounds_per_box": 20,
+                "boxes_per_case": null
+            },
+            "ballistics": {
+                "muzzle_velocity_fps": null,
+                "muzzle_energy_ft_lbs": null,
+                "test_barrel_length_in": null
+            },
+            "image": null,
+            "sources": [],
+            "status": "unverified",
+            "last_updated": "2026-07-15",
+            "_catalog_path": "catalog/winchester/020892201989.json"
+        }
+    ]
 }