fix(test): repoint lookup tests to article_fetcher.fetch_article_text

The two test_lookup_tool.py cases were patching the now-deleted
fabledassistant.services.rss._fetch_full_article. The trafilatura URL→text
helper moved to services/article_fetcher in the RSS hard-cut.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tests/test_lookup_tool.py

@@ -34,7 +34,7 @@ async def test_lookup_wikipedia_miss_searxng_fallback():
     with patch("fabledassistant.services.wikipedia.wiki_summary", new_callable=AsyncMock, return_value=None), \
          patch("fabledassistant.config.Config") as mock_config, \
          patch("fabledassistant.services.research._search_searxng", new_callable=AsyncMock, return_value=searxng_results), \
-         patch("fabledassistant.services.rss._fetch_full_article", new_callable=AsyncMock, return_value="Full article about QUIC..."):
+         patch("fabledassistant.services.article_fetcher.fetch_article_text", new_callable=AsyncMock, return_value="Full article about QUIC..."):
         mock_config.searxng_enabled.return_value = True
         result = await lookup_tool(user_id=1, arguments={"query": "QUIC"})
 
@@ -59,7 +59,7 @@ async def test_lookup_parallel_both_sources():
     with patch("fabledassistant.services.wikipedia.wiki_summary", new_callable=AsyncMock, return_value=wiki_data), \
          patch("fabledassistant.config.Config") as mock_config, \
          patch("fabledassistant.services.research._search_searxng", new_callable=AsyncMock, return_value=searxng_results), \
-         patch("fabledassistant.services.rss._fetch_full_article", new_callable=AsyncMock, return_value="Current president is..."):
+         patch("fabledassistant.services.article_fetcher.fetch_article_text", new_callable=AsyncMock, return_value="Current president is..."):
         mock_config.searxng_enabled.return_value = True
         result = await lookup_tool(user_id=1, arguments={"query": "president of the united states"})