Python: Add load_dotenv to get-started samples and fix chat_response_… (#6691)

* Python: Add load_dotenv to get-started samples and fix chat_response_cancellation docs

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Amit Dhawan <amit.dhawan@barco.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

python/samples/01-get-started/05_functional_workflow_with_agents.py

@@ -12,6 +12,10 @@ import asyncio
 from agent_framework import Agent, workflow
 from agent_framework.foundry import FoundryChatClient
 from azure.identity import AzureCliCredential
+from dotenv import load_dotenv
+
+# Load environment variables from .env file (e.g., FOUNDRY_PROJECT_ENDPOINT, FOUNDRY_MODEL)
+load_dotenv()
 
 # <create_agents>
 client = FoundryChatClient(credential=AzureCliCredential())

python/samples/02-agents/chat_client/chat_response_cancellation.py

@@ -24,8 +24,9 @@ async def main() -> None:
     Creates a task for the chat request, waits briefly, then cancels it to show proper cleanup.
 
     Configuration:
-    - OpenAI model ID: Use "model" parameter or "OPENAI_MODEL" environment variable
-    - OpenAI API key: Use "api_key" parameter or "OPENAI_API_KEY" environment variable
+    - FOUNDRY_PROJECT_ENDPOINT: Azure AI Foundry project endpoint URL
+    - FOUNDRY_MODEL: Model deployment name (e.g. gpt-4o)
+    - Authentication: Run `az login` to authenticate via AzureCliCredential
     """
     client = FoundryChatClient(credential=AzureCliCredential())