Reduce LLM rewrite calls and add report intro conclusion

ai_daily_report/rewrite.py

@@ -83,8 +83,9 @@ def rewrite_items(
     items: list[NewsItem],
     *,
     llm_call: RewriteLlmCall,
-    batch_size: int = 10,
+    batch_size: int = 30,
     max_fallback_ratio: float = 0.2,
+    retry_single_items: bool = False,
 ) -> tuple[list[NewsItem], dict[str, Any]]:
     rewritten_count = 0
     fallback_count = 0
@@ -100,6 +101,11 @@ def rewrite_items(
                     _fallback(item)
                     fallback_count += 1
                 continue
+            if not retry_single_items:
+                for item in batch:
+                    _fallback(item)
+                    fallback_count += 1
+                continue
             for item in batch:
                 try:
                     rewritten_count += _apply_rewrite_batch([item], llm_call)