feat(F-158): completed feature

backlog/features.json

@@ -6692,6 +6692,23 @@
         "close": true
       },
       "completed_at": "2026-08-22T15:42:35Z"
+    },
+    {
+      "id": "F-158",
+      "type": "fix",
+      "title": "POS use same-origin API proxy on LAN",
+      "description": "Browser POS requests must use /api proxy instead of localhost:3000; proxy forwards backend cookies and terminal headers.",
+      "priority": "high",
+      "risk": "med",
+      "status": "done",
+      "created_at": "2026-08-22",
+      "gates": {
+        "reviewer": true,
+        "security": true,
+        "qa": true,
+        "close": true
+      },
+      "completed_at": "2026-08-22T15:50:54Z"
     }
   ]
 }