feat: Display final_output_url in pipeline completion message - shows presigned S3 URL where all component outputs are stored with expiry time

app.py

@@ -1237,6 +1237,12 @@ Here's what I'll do:
                     
                     # V3: Check if we have S3 final output URL
                     final_output_url = final_payload.get("final_output_url", "")
+                    final_output_expires = final_payload.get("final_output_expires_at", "")
+                    
+                    # Build URL section
+                    url_section = ""
+                    if final_output_url:
+                        url_section = f"\n📊 **Results Available:**\n- [Download All Outputs]({final_output_url})\n- Expires: {final_output_expires}\n"
                     
                     friendly_final = f"""🎉 **Pipeline Completed Successfully!**
 
@@ -1245,7 +1251,7 @@ Here's what I'll do:
 - Total Steps: {len(steps_completed)}
 - Successful: {success_count}
 - Executor: {executor_used}
-
+{url_section}
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