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This pull request improves the setup instructions and automation for the Fraud Intelligence AI challenge by clarifying the Codespace onboarding process and ensuring all walkthrough scripts are executable. The most important changes are:

Documentation improvements:

• Added a note and screenshot instructing users to select Never when prompted to open the full repository after Codespace setup, to avoid confusion during onboarding. [1] [2]
• Updated the challenge and solution walkthroughs to include a step for preparing scripts, ensuring the user can run all walkthrough scripts in subsequent challenges. [1] [2]

Automation:

• Added a new script prepare-scripts.sh that makes all shell scripts in the walkthrough directory executable, streamlining the preparation process for the user.