Replace shell commands that fail on Windows with Node.js scripts:
- mkdir -p / cp -r → scripts/copy-assets.js
- rm -rf → scripts/clean.js
- Add scripts/ensure-dirs.js for directory creation
This resolves "A subdirectory or file -p already exists" errors
when running npm scripts on Windows with Git Bash.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>