feat(ADM-018): completed feature

work/artifacts/F-020/security.json

@@ -0,0 +1,15 @@
+{
+  "feature_id": "F-020",
+  "agent": "security",
+  "verdict": "APPROVED",
+  "summary": "Security approved. No new dependencies or secrets were introduced. Admin operations are protected, calculate route strips unknown fields, SQL is parameterized, and DB constraints prevent negative costs.",
+  "evidence": [
+    "cd project && npm audit --audit-level=high --omit=dev: found 0 vulnerabilities",
+    "Secret scan found only a test fixture password, no committed credentials",
+    "Reviewed /shipping/zones and /shipping/methods: admin-only creation",
+    "Reviewed /shipping/calculate: zod schema strips unknown fields and validates country/postal code",
+    "Reviewed repository SQL: parameterized queries only",
+    "Reviewed migration CHECK constraints for base cost and free shipping threshold"
+  ],
+  "timestamp": "2026-08-15T18:02:47Z"
+}