Update ai-patterns.md (#226)

references/python/ai-patterns.md

@@ -322,6 +322,10 @@ class DurableAgentWorkflow:
         return result.output
 ```
 
+## Streaming LLM Output / Tool Calls / etc. to a UI
+
+For streaming tokens or progress events from an Activity to an outside subscriber (browser, terminal, SSE endpoint), see `references/python/workflow-streams.md`. Workflow Streams is a `contrib` module that handles batching, dedup, and offset-based consumption built on Signals, Updates, and Queries.
+
 ## Best Practices
 
 1. **Always use Pydantic data converter** for complex types