diff --git a/electron/preload.js b/electron/preload.js
index 2ed05e8e..3613fadb 100644
--- a/electron/preload.js
+++ b/electron/preload.js
@@ -1,7 +1,5 @@
 const { contextBridge, ipcRenderer } = require('electron');
 
-// eslint-disable-next-line no-console
-console.log('[diag][preload] start, ua=', navigator.userAgent);
 
 // E2E gate: set the renderer flag BEFORE any page script parses so the
 // production-build store-on-window expose fires deterministically when