01-tutorials - [Content Improvement] LangGraph tutorial uses deprecated create_react_agent API

[mo7amed7assan1911]

Which component is impacted by this improvement?

• 01-AgentCore-runtime
• 02-AgentCore-gateway
• 03-AgentCore-identity
• 04-AgentCore-memory
• 05-AgentCore-tools
• 06-AgentCore-observability
• 07-AgentCore-E2E

Improvement Description
A clear and concise description of the improvement.

The existing tutorial using-langgraph-agent-hooks in 04-AgentCore-memory/02-long-term-memory/01-single-agent/ uses:

• create_react_agent
• pre_model_hook / post_model_hook parameters

These are deprecated in LangGraph v1.0.

Impact:

• Users following the tutorial encounter deprecation warnings
• Code may break in future LangGraph versions
• No example exists for the new middleware pattern

Suggested Improvement:
Add a new tutorial demonstrating LangGraph v1.0 approach using create_agent with @before_model / @after_model middleware decorators.

I have a working implementation ready to submit as a PR.