add agents example with memory

[Boburmirzo]

Summary

This PR adds a comprehensive cookbook example demonstrating how to integrate Memori (an open-source memory engine) with OpenAI Agents to create AI assistants with persistent memory capabilities. The example shows how to build agents that can remember past conversations, learn user preferences, and provide personalized responses across different chat sessions.

Motivation

Current OpenAI Agent examples lack persistent memory capabilities, which limits their usefulness in real-world applications where continuity and personalization are important. This cookbook addresses that gap by:

• Filling a Documentation Gap: Provides the first comprehensive example of adding persistent memory to OpenAI Agents
• Demonstrating Integration: Shows how to combine OpenAI Agents SDK with third-party memory solutions
• Real-World Applicability: Enables building more sophisticated agents for customer support, personal assistants, learning companions, and research assistants
• Educational Value: Teaches developers how to implement both short-term and long-term memory systems in their agents

The example enhances the OpenAI Cookbook by showing practical patterns for building stateful, memory-enhanced AI agents that can provide more intelligent and personalized user experiences.

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