Reduce parent_height from 80 to 40 and add thread debugging
- Reduced parent_height parameter from 80 to 40 to limit deep thread nesting
- Added debug print/exit to inspect thread prompt structure
- Improved thread preview logging to show meaningful content fields
- This helps identify the token-inefficient YAML representation issue
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>