feat(F-139): completed feature

work/artifacts/F-139/security.json

@@ -0,0 +1,12 @@
+{
+  "feature_id": "F-139",
+  "agent": "security",
+  "stage": "security_gate",
+  "verdict": "APPROVED",
+  "summary": "Bug fix: no new auth, no new routes, no secrets. SSE proxy headers only. Client reconnection is client-side only.",
+  "checks": [
+    {"item": "No new auth", "ok": true, "evidence": "Same auth flow as before; proxy does not modify credentials"},
+    {"item": "No new secrets", "ok": true, "evidence": "No new env vars or credentials"}
+  ],
+  "issues": []
+}