Added comprehensive documentation for the debug mode feature including:
- Environment variable configuration (NEXT_PUBLIC_DEBUG)
- What debug mode shows (prompts, responses, timestamps)
- How to use the debug panel (copy, clear, expand)
- Why it's useful (troubleshooting, learning, bug reports)
- Example use cases (verify positions, check evaluations, etc.)
- Warning about production usage
This helps users understand how to enable and use debug mode to
troubleshoot AI behavior and understand how the system works.