Add plan document for preinstall enhancements PR

PREINSTALL_ENHANCEMENTS_PLAN.md

@@ -0,0 +1,43 @@
+# Preinstall Enhancements PR
+
+## Overview
+This PR contains enhancements to the ComfyUI startup script (`run_comfyui.bat`) that improve the user experience for Windows users by automatically checking dependencies, detecting virtual environments, and offering to install missing packages.
+
+## Changes Included
+
+### Files Changed
+- `run_comfyui.bat` - Enhanced batch file with:
+  - UTF-8 encoding support for proper Unicode display
+  - Comprehensive dependency checking (critical and optional)
+  - Virtual environment detection and warnings
+  - CUDA PyTorch auto-installation with progress bars
+  - User-friendly error messages and troubleshooting tips
+  - ASCII art banner with "Comfy" text
+- `create_shortcut.ps1` - PowerShell script for desktop shortcut creation
+
+### Key Features
+1. **Automated Dependency Checking**: Checks all critical Python dependencies before launching
+2. **CUDA PyTorch Detection**: Automatically detects CPU-only PyTorch and offers to install CUDA version
+3. **Progress Bars**: Shows progress during pip installations
+4. **User-Friendly Prompts**: Clear, interactive prompts for installation options
+5. **Error Handling**: Detailed error messages with troubleshooting steps
+
+## PR Status
+- **Branch**: `preinstall-enhancements`
+- **Base**: `master`
+- **Status**: Ready for PR submission
+- **Commits**: 2 commits (run_comfyui.bat enhancements, create_shortcut.ps1)
+
+## Testing Recommendations
+1. Test in clean environment with no dependencies
+2. Test with missing critical dependencies
+3. Test with missing optional dependencies
+4. Test CPU-only PyTorch detection and installation
+5. Test virtual environment detection
+6. Test error handling scenarios
+
+## Notes
+- All changes are backward compatible
+- No breaking changes to existing functionality
+- Works with both system Python and virtual environments
+