feat: replace search_web with unified lookup tool (Wikipedia + SearXNG fallback)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/test_lookup_tool.py

@@ -0,0 +1,61 @@
+import pytest
+from unittest.mock import AsyncMock, patch
+
+
+@pytest.mark.asyncio
+async def test_lookup_wikipedia_hit():
+    wiki_data = {
+        "title": "QUIC",
+        "extract": "QUIC is a transport layer protocol.",
+        "url": "https://en.wikipedia.org/wiki/QUIC",
+    }
+
+    with patch("fabledassistant.services.wikipedia.wiki_summary", new_callable=AsyncMock, return_value=wiki_data):
+        from fabledassistant.services.tools.web import lookup_tool
+        result = await lookup_tool(user_id=1, arguments={"query": "QUIC"})
+
+    assert result["success"] is True
+    assert result["type"] == "lookup"
+    assert result["source"] == "wikipedia"
+    assert result["data"]["title"] == "QUIC"
+
+
+@pytest.mark.asyncio
+async def test_lookup_wikipedia_miss_searxng_fallback():
+    searxng_results = [
+        {"url": "https://example.com/quic", "title": "QUIC Explained", "snippet": "An overview..."},
+    ]
+
+    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..."):
+        mock_config.searxng_enabled.return_value = True
+        from fabledassistant.services.tools.web import lookup_tool
+        result = await lookup_tool(user_id=1, arguments={"query": "QUIC"})
+
+    assert result["success"] is True
+    assert result["source"] == "web"
+    assert result["data"]["results"]
+
+
+@pytest.mark.asyncio
+async def test_lookup_wikipedia_miss_no_searxng():
+    with patch("fabledassistant.services.wikipedia.wiki_summary", new_callable=AsyncMock, return_value=None), \
+         patch("fabledassistant.config.Config") as mock_config:
+        mock_config.searxng_enabled.return_value = False
+        from fabledassistant.services.tools.web import lookup_tool
+        result = await lookup_tool(user_id=1, arguments={"query": "xyznonexistent"})
+
+    assert result["success"] is True
+    assert result["source"] == "none"
+
+
+@pytest.mark.asyncio
+async def test_lookup_always_available():
+    with patch("fabledassistant.services.tools._registry.is_caldav_configured", new_callable=AsyncMock, return_value=False), \
+         patch("fabledassistant.services.settings.get_setting", new_callable=AsyncMock, return_value="false"):
+        from fabledassistant.services.tools import get_tools_for_user
+        tools = await get_tools_for_user(user_id=1)
+        tool_names = {t["function"]["name"] for t in tools}
+        assert "lookup" in tool_names