upgrade: gemini-3.1-flash-lite-preview + jina X-Engine=direct timeout=30s

acra.py

@@ -7,7 +7,7 @@ from typing import List
 
 client      = genai.Client(api_key=os.environ["GEMINI_API_KEY"])
 EMBED_MODEL = "gemini-embedding-001"
-GEN_MODEL   = "gemini-2.5-flash-lite"
+GEN_MODEL   = "gemini-3.1-flash-lite-preview"
 DEPTH       = {0: 3, 1: 3, 2: 6, 3: 10}
 
 def embed_texts(texts):
@@ -44,8 +44,9 @@ def web_search(query: str, max_results: int = 5) -> List[dict]:
                 "Authorization": f"Bearer {jina_key}",
                 "Accept": "application/json",
                 "X-Retain-Images": "none",
+                "X-Engine": "direct",
             },
-            timeout=20.0,
+            timeout=30.0,
             follow_redirects=True
         )
         if r.status_code != 200: