fix(engineering-dashboard): drop startup token for personal local use

Rely on loopback bind plus Host/Origin checks; open http://127.0.0.1:8787/
without a query token after SSH tunnel.

Co-authored-by: Cursor <cursoragent@cursor.com>

cmd/engineering-dashboard/main.go

@@ -91,7 +91,7 @@ func runServe(args []string) error {
 	if err != nil {
 		return err
 	}
-	fmt.Printf("engineering-dashboard listening on http://%s/?token=%s\n", addr, srv.Token)
+	fmt.Printf("engineering-dashboard listening on http://%s/\n", addr)
 	fmt.Printf("repo=%s\n", root)
 	return engineeringdashboard.ListenAndServe(addr, srv.Handler())
 }