docs: Add comprehensive README and update project documentation

- Create professional README.md with installation, usage, and troubleshooting
- Update PROCEDURES.md with hard-learned ComfyUI development lessons
- Update CLAUDE.md with successful architecture patterns and anti-patterns
- Document the journey from over-engineered complexity to working simplicity

Key lessons captured:
- Single-file architecture eliminates import hell
- Zero dependencies prevents ecosystem conflicts
- Embedded constants beat complex import chains
- ComfyUI ecosystem favors simple solutions that just work

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

README.md

@@ -1,2 +1,116 @@
-# ComfyUI-Image-Size-Tool
-A ComfyUI node for setting image sizes based on the model being used.
+# ComfyUI Image Size Tool
+
+A professional resolution calculator node pack for ComfyUI that provides model-specific, constraint-aware image dimensions for optimal AI generation quality.
+
+## Why This Tool Exists
+
+Most existing resolution tools either:
+- Force you to manually enter width/height (error-prone)
+- Ignore model-specific training constraints 
+- Provide arbitrary resolutions that hurt generation quality
+- Break your ComfyUI installation with complex dependencies
+
+This tool solves the **resolution calculation problem** by providing curated, model-optimized presets based on actual training specifications and bucket systems.
+
+## Features
+
+✅ **Zero Dependencies** - No external libraries, no conflicts, no breakage  
+✅ **Model-Aware** - Respects VAE constraints (div by 8/64) and training buckets  
+✅ **Quality Focused** - Uses actual SDXL bucket resolutions, not arbitrary calculations  
+✅ **Plug & Play** - Simple dropdowns, clean outputs, works immediately  
+✅ **Professional** - Semantic versioning, proper documentation, stable API  
+
+## Included Nodes
+
+### SD 1.5 Resolution
+- **8 optimized presets** from 512×512 to 912×512
+- **Divisible by 8** constraint validation (VAE requirement)
+- **Outputs:** `width`, `height`, `aspect_ratio`
+
+### SDXL Resolution  
+- **13 bucket-trained presets** targeting ~1 megapixel
+- **Divisible by 64** constraint validation
+- **Based on the 43-bucket training system** for optimal quality
+- **Outputs:** `width`, `height`, `aspect_ratio`, `total_pixels`
+
+### Flux.1 Dev Resolution
+- **11 practical presets** from 1024×1024 to 2560×1440
+- **No strict constraints** - more flexible than SD models
+- **Hardware-optimized** for common use cases
+- **Outputs:** `width`, `height`, `aspect_ratio`
+
+## Installation
+
+### Method 1: Git Clone (Recommended)
+```bash
+cd ComfyUI/custom_nodes
+git clone https://github.com/TheLustriVA/ComfyUI-Image-Size-Tool.git
+```
+
+### Method 2: ComfyUI Manager
+1. Open ComfyUI Manager
+2. Install from Git URL: `https://github.com/TheLustriVA/ComfyUI-Image-Size-Tool`
+
+No additional dependencies to install - just restart ComfyUI.
+
+## Usage
+
+1. **Add Node**: Search for "Image Size Tool" in the node menu
+2. **Select Resolution**: Choose from the dropdown (e.g., "1920×1080 (16:9) - Full HD")
+3. **Connect Outputs**: Wire `width` and `height` to your Empty Latent Image node
+4. **Generate**: Enjoy optimal quality with proper model constraints
+
+### Example Workflow
+```
+[Flux.1 Dev Resolution] → [Empty Latent Image] → [KSampler] → [VAE Decode] → [Save Image]
+     ↓ width=1920
+     ↓ height=1080
+```
+
+## Why Model-Specific Resolutions Matter
+
+### SD 1.5
+- **Trained at 512×512** - quality degrades significantly when deviating
+- **VAE constraint** - dimensions must be divisible by 8 or generation fails
+
+### SDXL  
+- **Bucket training system** - uses 43 specific resolutions targeting 1MP
+- **Quality buckets** - arbitrary resolutions produce inferior results
+- **VAE constraint** - dimensions must be divisible by 64
+
+### Flux.1 Dev
+- **Flexible architecture** - handles 0.2 to 2 megapixels effectively  
+- **Hardware optimized** - common resolutions for practical generation
+
+## Troubleshooting
+
+### Nodes Don't Appear
+```bash
+cd ComfyUI/custom_nodes/ComfyUI-Image-Size-Tool
+git pull
+find . -name "__pycache__" -exec rm -rf {} +
+```
+Then restart ComfyUI.
+
+### Import Errors (If Any)
+This tool uses zero external dependencies and a single-file architecture specifically to avoid import issues. If you encounter problems, please open an issue.
+
+## Technical Details
+
+- **Architecture**: Single-file design with embedded constants
+- **Dependencies**: None (Python stdlib only)
+- **Compatibility**: ComfyUI (all recent versions)
+- **Performance**: Instant loading, zero overhead
+
+## Contributing
+
+Issues and pull requests welcome! This tool aims to be the definitive resolution calculator for ComfyUI.
+
+## License
+
+MIT License - see LICENSE file for details.
+
+---
+
+**Generated with professional AI development practices**  
+*No more resolution guesswork - just optimal image generation*