fix: correct DuckDuckGo API call and database search execution

- Fix ddgs.news() to use query as first positional argument
- Fix database search to run synchronous function in executor
- Resolves TypeError: DDGS.news() missing required argument
- Resolves Database search error: unhashable type 'list'

src/core/orchestrator/query_orchestrator.py

@@ -378,11 +378,16 @@ class QueryOrchestrator:
             search_tasks = []
             for i, lang in enumerate(languages):
                 sparse_vec = sparse_embeddings[i].get("sparse")
-                task = vector_store.search_with_vectors(
-                    dense_vec=dense_vec,
-                    sparse_vec=sparse_vec,
-                    limit=top_k,
-                    language_filter=lang
+                # search_with_vectors is synchronous, so we run it in executor
+                task = asyncio.get_event_loop().run_in_executor(
+                    None,
+                    vector_store.search_with_vectors,
+                    dense_vec,
+                    sparse_vec,
+                    top_k,
+                    None,  # source_filter
+                    lang,  # language_filter
+                    None   # days_back
                 )
                 search_tasks.append(task)
             

src/infrastructure/adapters/duckduckgo_adapter.py

@@ -139,9 +139,9 @@ class DuckDuckGoAdapter:
         results = []
         
         try:
-            # DuckDuckGo news search
+            # DuckDuckGo news search (ddgs package uses query as first positional arg)
             raw_results = self.ddgs.news(
-                keywords=query,
+                query,  # First positional argument
                 region=region,
                 max_results=max_results
             )