Restrict plugin lookups and reuse cached chat reads (Refs #98)

src/lib/server/auth/access.ts

@@ -78,7 +78,12 @@ export function routePermission(routeId: string | null, method: string): RoutePe
         return 'admin';
 
     // These reads initiate fleet file scans or spend external API quota.
-    if (routeId === '/api/drift' || routeId === '/api/plugins/github/release') return 'operator';
+    if (
+        routeId === '/api/drift' ||
+        routeId === '/api/plugins/github/release' ||
+        routeId === '/api/plugins/updates'
+    )
+        return 'operator';
 
     // Summaries remain visible to viewers; raw configuration, historical file
     // bytes, and unfiltered diagnostics may contain runtime credentials.