feat: add detect_all() for multi-variant detection

tests/test_llms_txt_detector.py

@@ -50,3 +50,28 @@ def test_url_parsing_with_complex_paths():
             timeout=5,
             allow_redirects=True
         )
+
+def test_detect_all_variants():
+    """Test detecting all llms.txt variants"""
+    detector = LlmsTxtDetector("https://hono.dev/docs")
+
+    with patch('cli.llms_txt_detector.requests.head') as mock_head:
+        # Mock responses for different variants
+        def mock_response(url, **kwargs):
+            response = Mock()
+            # All 3 variants exist for Hono
+            if 'llms-full.txt' in url or 'llms.txt' in url or 'llms-small.txt' in url:
+                response.status_code = 200
+            else:
+                response.status_code = 404
+            return response
+
+        mock_head.side_effect = mock_response
+
+        variants = detector.detect_all()
+
+        assert len(variants) == 3
+        assert any(v['variant'] == 'full' for v in variants)
+        assert any(v['variant'] == 'standard' for v in variants)
+        assert any(v['variant'] == 'small' for v in variants)
+        assert all('url' in v for v in variants)