Stop pinning cli_real_flows assertion to live page text

pirate.github.io/stress-tests/challenge.html is a live URL whose
contents can be edited at any time. The previous assertion required
the exact title text "Browser-use Challenge for AI Browser Drivers"
to appear in the wget output, which broke as soon as the page title
was renamed (e.g. to "Browser Agent Challenge…").

Instead, verify the URL was fetched into its own wget snapshot directory
with non-trivial HTML content. That still covers the actual invariant
(wget archived the URL successfully) without coupling the test to
page-content drift on an external site.

archivebox/tests/test_cli_real_flows.py

@@ -180,7 +180,13 @@ def test_cli_add_real_urls_with_options_writes_inspectable_outputs(tmp_path, pro
 
     combined_html = "\n".join(path.read_text(errors="ignore") for path in html_outputs)
     assert "Example Domain" in combined_html
-    assert "Browser-use Challenge for AI Browser Drivers" in combined_html
+    # Don't pin to exact page text — pirate.github.io/stress-tests/challenge.html
+    # can be edited at any time. Verify the URL was fetched into its own wget
+    # snapshot with non-trivial HTML content instead.
+    challenge_html_files = [p for p in html_outputs if "pirate.github.io" in str(p)]
+    assert challenge_html_files, f"No wget html output for challenge.html in {[str(p) for p in html_outputs]}"
+    assert any(p.stat().st_size > 1024 for p in challenge_html_files), \
+        f"challenge.html wget output is empty/trivial: {[(str(p), p.stat().st_size) for p in challenge_html_files]}"
 
     assert processes
     assert any("wget" in (pwd or "") or "wget" in (cmd or "") for _type, _status, _exit, pwd, cmd in processes)