Fix missing zh-CN translation for lesson 13 (Agent Memory)

[Copilot]

translations/zh-CN/13-agent-memory/README.md had only the title and thumbnail translated — the entire body content was English.

Changes

• Replaced all English body text with complete Simplified Chinese translation covering:
  • Introduction, available implementations, and learning goals
  • All memory type definitions (working, short-term, long-term, persona, episodic/workflow, entity, structured RAG)
  • Mem0, Cognee, and Azure AI Search implementation sections
  • Self-improving agent pattern and memory optimization strategies
• Proper nouns (Mem0, Cognee, RAG, LLM, Azure AI Search, Microsoft Agent Framework) kept in English, consistent with other zh-CN lessons

[github-actions]

👋 Thanks for contributing @copilot! We will review the pull request and get back to you soon.

[Copilot]

Copilot wasn't able to review any files in this pull request.

[leestott]

@copilot this is the URL of the file to be translated from English to Chinese https://github.com/microsoft/ai-agents-for-beginners/tree/main/translations/zh-CN/13-agent-memory

[Copilot]

@copilot this is the URL of the file to be translated from English to Chinese https://github.com/microsoft/ai-agents-for-beginners/tree/main/translations/zh-CN/13-agent-memory

The README.md in that directory has been fully translated into Chinese Simplified in commit caf8752. The two notebook files (13-agent-memory.ipynb and 13-agent-memory-cognee.ipynb) were already in Chinese prior to this PR. All files in the translations/zh-CN/13-agent-memory/ directory are now in Chinese Simplified.