add help docs and ?

docs/nodes/Rotate.md

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+# Rotate
+
+Rotate a DATA_FIELD counterclockwise by an angle in degrees. Optionally expand the canvas to keep the full rotated field while preserving the field center.
+
+## Inputs
+
+| Name | Type | Required | Description |
+|------|------|----------|-------------|
+| field | DATA_FIELD | Yes | Input field to rotate |
+
+## Outputs
+
+| Name | Type | Description |
+|------|------|-------------|
+| field | DATA_FIELD | Rotated field |
+
+## Controls
+
+| Name | Type | Default | Description |
+|------|------|---------|-------------|
+| angle | FLOAT | 90.0 | Rotation angle in degrees, counterclockwise (−360 to 360) |
+| interpolation | dropdown | bilinear | Interpolation method for resampling: bilinear, nearest, or bicubic |
+| expand_canvas | BOOLEAN | True | When True, canvas is expanded to contain the full rotated image; when False, canvas is clipped to original size |
+
+## Limitations
+
+- Rotation by angles other than multiples of 90° introduces interpolation artefacts.
+- expand_canvas may produce fields with non-square pixel sizes for arbitrary angles.