chore: import upstream snapshot with attribution

python/samples/03-workflows/declarative/simple_workflow/README.md

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+# Simple Workflow Sample
+
+This sample demonstrates the basics of declarative workflows:
+- Setting variables
+- Evaluating expressions
+- Sending output to users
+
+## Files
+
+- `workflow.yaml` - The workflow definition
+- `main.py` - Python code to execute the workflow
+
+## Running
+
+```bash
+python main.py
+```
+
+## What It Does
+
+1. Sets a greeting variable
+2. Sets a name from input (or uses default)
+3. Combines them into a message
+4. Sends the message as output

python/samples/03-workflows/declarative/simple_workflow/main.py

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+# Copyright (c) Microsoft. All rights reserved.
+
+"""Simple workflow sample - demonstrates basic variable setting and output."""
+
+import asyncio
+from pathlib import Path
+
+from agent_framework.declarative import WorkflowFactory
+
+
+async def main() -> None:
+    """Run the simple greeting workflow."""
+    # Create a workflow factory
+    factory = WorkflowFactory()
+    # Load the workflow from YAML
+    workflow_path = Path(__file__).parent / "workflow.yaml"
+    workflow = factory.create_workflow_from_yaml_path(workflow_path)
+    print(f"Loaded workflow: {workflow.name}")
+    print("-" * 40)
+    # Run with default name
+    print("\nRunning with default name:")
+    result = await workflow.run({})
+    for output in result.get_outputs():
+        print(f"  Output: {output}")
+    # Run with a custom name
+    print("\nRunning with custom name 'Alice':")
+    result = await workflow.run({"name": "Alice"})
+    print("\n" + "-" * 40)
+    print("Workflow completed!")
+
+
+if __name__ == "__main__":
+    asyncio.run(main())

python/samples/03-workflows/declarative/simple_workflow/workflow.yaml

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+name: simple-greeting-workflow
+description: A simple workflow that greets the user
+
+actions:
+  # Set a greeting prefix
+  - kind: SetValue
+    id: set_greeting
+    displayName: Set greeting prefix
+    path: Local.greeting
+    value: Hello
+
+  # Set the user's name from input, or use a default
+  - kind: SetValue
+    id: set_name
+    displayName: Set user name
+    path: Local.name
+    value: =If(IsBlank(inputs.name), "World", inputs.name)
+
+  # Build the full message
+  - kind: SetValue
+    id: build_message
+    displayName: Build greeting message
+    path: Local.message
+    value: =Concat(Local.greeting, ", ", Local.name, "!")
+
+  # Send the greeting to the user
+  - kind: SendActivity
+    id: send_greeting
+    displayName: Send greeting to user
+    activity:
+      text: =Local.message
+
+  # Also store it in outputs
+  - kind: SetValue
+    id: set_output
+    displayName: Store result in outputs
+    path: Workflow.Outputs.greeting
+    value: =Local.message