Python: Fix broken samples and add missing READMEs (#5038)

* Python: Fix broken samples and add missing READMEs

- simple_context_provider: move instructions kwarg into options dict
- suspend_resume_session: use OpenAIChatCompletionClient for in-memory demo
- foundry_chat_client_with_hosted_mcp: move store kwarg into options dict
- Add README.md for context_providers and conversations sample folders

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Python: Fix additional sample issues in context_providers

- mem0_basic: send preferences query before sleep so Mem0 can learn them,
  print result from new session recall
- mem0_sessions: add session for multi-turn conversation in agent-scoped
  example, remove user_id from agent-scoped provider (Mem0 API stores
  memories without user_id when agent_id is provided), use single message
  for storing preferences
- redis_basics: print retrieved context messages instead of raw object
- redis_sessions: add missing load_dotenv() call
- redis_basics/redis_sessions: fix docstrings referencing wrong client type
- azure_redis_conversation: replace duplicate copyright with load_dotenv()

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Python: Fix broken link in declarative README

openai_responses_agent.py was renamed to openai_agent.py

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

python/samples/02-agents/conversations/README.md

@@ -0,0 +1,28 @@
+# Conversation & Session Management Samples
+
+These samples demonstrate different approaches to managing conversation history and session state in Agent Framework.
+
+## Samples
+
+| File | Description |
+|------|-------------|
+| [`suspend_resume_session.py`](suspend_resume_session.py) | Suspend and resume conversation sessions, comparing service-managed sessions (Azure AI Foundry) with in-memory sessions (OpenAI). |
+| [`custom_history_provider.py`](custom_history_provider.py) | Implement a custom history provider by extending `BaseHistoryProvider`, enabling conversation persistence in your preferred storage backend. |
+| [`redis_history_provider.py`](redis_history_provider.py) | Use Redis as a history provider for persistent conversation history storage across sessions. |
+
+## Prerequisites
+
+**For `suspend_resume_session.py`:**
+- `FOUNDRY_PROJECT_ENDPOINT`: Your Azure AI Foundry project endpoint (service-managed session)
+- `FOUNDRY_MODEL`: The Foundry model deployment name
+- `OPENAI_API_KEY`: Your OpenAI API key (in-memory session)
+- Azure CLI authentication (`az login`)
+
+**For `custom_history_provider.py`:**
+- `OPENAI_API_KEY`: Your OpenAI API key
+
+**For `redis_history_provider.py`:**
+- `OPENAI_API_KEY`: Your OpenAI API key
+- A running Redis server — default URL is `redis://localhost:6379`
+  - Override via the `REDIS_URL` environment variable for remote or authenticated instances
+  - Quickstart with Docker: `docker run -d --name redis-stack -p 6379:6379 redis/redis-stack-server:latest`

python/samples/02-agents/conversations/suspend_resume_session.py

@@ -4,6 +4,7 @@ import asyncio
 
 from agent_framework import Agent, AgentSession
 from agent_framework.foundry import FoundryChatClient
+from agent_framework.openai import OpenAIChatCompletionClient
 from azure.identity.aio import AzureCliCredential
 from dotenv import load_dotenv
 
@@ -62,7 +63,7 @@ async def suspend_resume_in_memory_session() -> None:
     # OpenAI Chat Client is used as an example here,
     # other chat clients can be used as well.
     agent = Agent(
-        client=FoundryChatClient(),
+        client=OpenAIChatCompletionClient(),
         name="MemoryBot",
         instructions="You are a helpful assistant that remembers our conversation.",
     )