feat: yield to event loop in file bulk operation (#8281)

letta/services/agent_manager.py

@@ -3074,10 +3074,14 @@ class AgentManager:
         # Generate visible content for each file
         line_chunker = LineChunker()
         visible_content_map = {}
-        for file_metadata in file_metadata_with_content:
+        for i, file_metadata in enumerate(file_metadata_with_content):
             content_lines = line_chunker.chunk_text(file_metadata=file_metadata)
             visible_content_map[file_metadata.file_name] = "\n".join(content_lines)
 
+            # Yield to event loop every 100 files to prevent saturation
+            if i > 0 and i % 100 == 0:
+                await asyncio.sleep(0)
+
         # Use bulk attach to avoid race conditions and duplicate LRU eviction decisions
         closed_files = await self.file_agent_manager.attach_files_bulk(
             agent_id=agent_state.id,