Browser smoke: a channel nobody has must show the not-found page; CHANNEL names a real channel when BASE is production (#194)

ddiff --git a/test/browser/smoke.js b/test/browser/smoke.js
iindex 82d59e96..14a613c0 100644
---- a/test/browser/smoke.js
++++ b/test/browser/smoke.js
@@@ -3,7 +3,9 @@
   * Browser smoke suite: real Chrome against a running server.
   *
   *   BASE=http://127.0.0.1:4188 npm run test:browser
-- *   BASE=https://openvibe.live node test/browser/smoke.js --routes-only
++ *   BASE=https://openvibe.live CHANNEL=/@goosely node test/browser/smoke.js --routes-only
++ *
++ * CHANNEL is a channel that exists on BASE (default /@admin, which only the test database has).
   *
   * Needs a running site and Chrome (CHROME_BIN or /usr/bin/google-chrome); it is not part of
   * `npm test`. No camera or microphone is used.
@@@ -31,6 +33,8 @@ const ROUTES = [
      ['/updates', 'page-updates'], ['/dashboard', null], [process.env.CHANNEL || '/@admin', 'page-channel'],
      // Answered 404 by the server (server/web/page-status.js) with the same shell.
      ['/no-such-page', 'page-not-found'],
++    // A channel nobody has: the not-found page at that address, not the home page (2026-10-17).
++    ['/@no_such_channel_x9', 'page-not-found'],
  ];
  const ONLY_SIGNED = process.argv.includes('--signed-in-only');
  // --a11y (or A11Y=1): axe-core on every route at the widest width; serious and critical WCAG 2.1 A/AA