feat: show semantic scholar request errors

main.py

@@ -68,6 +68,7 @@ def semantic_scholar(query: str, top_k: int = 10) -> list[Article]:
             "minCitationCount": 20,
         },
     )
+    resp.raise_for_status()
     results = resp.json()
     articles = []
     for i, article in enumerate(results.get("data", []), 1):