add a few more nodes

docs/nodes/Unrotate.md

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+# Unrotate
+
+Auto-detect and correct in-plane scan rotation. Computes a slope angle histogram, finds the dominant feature direction for the given symmetry, and rotates the image to align features with the axes.
+
+## Inputs
+
+| Name | Type | Required | Description |
+|------|------|----------|-------------|
+| field | DATA_FIELD | Yes | Input field to correct |
+
+## Outputs
+
+| Name | Type | Description |
+|------|------|-------------|
+| leveled | DATA_FIELD | Field with rotation corrected |
+
+## Controls
+
+| Name | Type | Default | Description |
+|------|------|---------|-------------|
+| symmetry | dropdown | 4-fold | Expected symmetry of the surface features: 2-fold, 3-fold, 4-fold, or 6-fold |
+
+## Notes
+
+- Best suited for crystalline or patterned surfaces where features have a clear preferred direction.
+- 4-fold symmetry is the most common choice for cubic crystal surfaces and rectangular gratings.
+- If the detected rotation is less than 0.01°, the data is returned unchanged.
+- Uses bilinear interpolation; edges are handled with nearest-neighbor extension.