Add CLAUDE.md with codebase guidance for Claude Code

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Documents setup commands, env variable requirements, the two provider patterns (AzureAIProjectAgentProvider vs OpenAIChatClient), agent construction flow, tool registration decorators, MCP resumable server architecture, and lesson/translation structure.

https://claude.ai/code/session_01CrNVwCz1fsewPiGabLy5m8

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[Copilot]

Pull request overview

Adds a repository-level CLAUDE.md intended to guide Claude Code when navigating and running this repo’s lesson samples, including setup steps, environment variables, and a high-level architecture summary.

Changes:

• Introduces CLAUDE.md with setup + “how to run” commands for notebooks and key samples.
• Documents environment variable expectations across lessons/providers.
• Summarizes agent/provider patterns and the Lesson 11 MCP resumable server architecture.

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