feat(F-108): completed feature

work/artifacts/F-108/security.json

@@ -0,0 +1,12 @@
+{
+  "feature_id": "F-108",
+  "agent": "security",
+  "verdict": "APPROVED",
+  "summary": "Lazy variant provisioning only executes with an authenticated admin session; unauthenticated GET variants returns empty list without side effects; no new write surface exposed publicly.",
+  "evidence": [
+    "deps.authenticate + role admin check before default variant creation",
+    "Price/stock/EAN endpoints keep existing admin auth",
+    "No secrets touched"
+  ],
+  "timestamp": "2026-08-21T07:57:11Z"
+}