test(external): fix third fake_fetch stub still requiring timeout=

test_downloaded_archive_gets_provenance_and_tagging's fake_fetch still had the
old `*, timeout` signature; the task now calls fetch_external() without it, so
the stub raised TypeError in the integration lane (run 1191). Switch it to
**kwargs like the other two.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/test_external_worker.py

@@ -222,7 +222,7 @@ def test_downloaded_archive_gets_provenance_and_tagging(db_sync, tmp_path, monke
     monkeypatch.setattr(ext, "IMAGES_ROOT", tmp_path)
     monkeypatch.setattr(ext, "_redis", lambda: _FakeRedis())
 
-    def fake_fetch(host, url, dest_dir, *, timeout, should_stop=lambda: False):
+    def fake_fetch(host, url, dest_dir, **kwargs):
         dest_dir.mkdir(parents=True, exist_ok=True)
         zpath = dest_dir / "pack.zip"
         with zipfile.ZipFile(zpath, "w") as z: