fix ops error

ops.py

@@ -212,14 +212,35 @@ def _fulltext_paragraphs(data: dict, section: str) -> Optional[str]:
 
 # ------------------------------- Public API --------------------------------
 
+def _to_cql(query: str) -> str:
+    """Turn a free-text query into a CQL expression OPS accepts.
+
+    OPS only auto-wraps a single bare word; multi-word queries like
+    'agentic ai' are invalid CQL and 404. Queries already containing a
+    relational operator ('=') are assumed to be hand-written CQL and passed
+    through unchanged.
+    """
+    q = query.strip()
+    if not q or "=" in q:
+        return q
+    escaped = q.replace('"', " ").strip()
+    return f'txt all "{escaped}"'
+
+
 async def ops_search(client: AsyncClient, query: str, n_results: int) -> list[dict]:
     """Keyword search against OPS published-data, normalized to SERP dicts."""
     n_results = max(1, min(n_results, 100))  # OPS caps a page at 100.
-    data = await _ops_get(
-        client,
-        "/published-data/search/biblio",
-        params={"q": query, "Range": f"1-{n_results}"},
-    )
+    try:
+        data = await _ops_get(
+            client,
+            "/published-data/search/biblio",
+            params={"q": _to_cql(query), "Range": f"1-{n_results}"},
+        )
+    except HTTPStatusError as e:
+        # OPS returns 404 (SERVER.EntityNotFound) when a search has no hits.
+        if e.response.status_code == 404:
+            return []
+        raise
     search = data.get("ops:world-patent-data", {}).get("ops:biblio-search", {})
     result = search.get("ops:search-result", {})
     results: list[dict] = []