Add Nodes/Image/Invert

Nodes%2FImage%2FInvert.md

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+# Invert
+
+---
+
+## 🔌 INPUT PORTS
+
+| Name        | Type        | Description                              |
+|-------------|-------------|------------------------------------------|
+| `inputTexture` | `ImageData` | The input image whose colors will be inverted. |
+
+---
+
+## 📤 EXPORT PORTS
+
+| Name        | Type        | Description                                 |
+|-------------|-------------|---------------------------------------------|
+| `inputTexture` | `ImageData` | The output image with inverted RGB channels. |
+
+---
+
+## 📝 DESCRIPTION
+
+The **Invert** node inverts the red, green, and blue channels of every pixel in the input texture.  
+Alpha is preserved as-is. This node can be used to create effects like photo negatives or simple stylizations.
+
+Inversion formula per channel:
+
+```
+R = 255 - R  
+G = 255 - G  
+B = 255 - B  
+A = A
+```
+
+This node is derived from [`BaseImageNode`](Nodes/BaseImageNode).
+
+---
+
+## ⚠️ KNOWN ISSUES
+
+- Currently only supports `Color32` format via `NativeArray`.