add help docs and ?

docs/nodes/Crop-Resize.md

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+# Crop / Resize
+
+Crop a DATA_FIELD with a draggable rectangle defined by two corners, then optionally resize it. Cropping updates physical extents and offsets; resizing preserves the cropped physical size.
+
+## Inputs
+
+| Name | Type | Required | Description |
+|------|------|----------|-------------|
+| field | DATA_FIELD | Yes | Input field to crop |
+| corner_a | COORD | No | Locks the top-left corner of the crop box |
+| corner_b | COORD | No | Locks the bottom-right corner of the crop box |
+
+## Outputs
+
+| Name | Type | Description |
+|------|------|-------------|
+| field | DATA_FIELD | Cropped (and optionally resampled) field |
+
+## Controls
+
+| Name | Type | Default | Description |
+|------|------|---------|-------------|
+| target_width | INT | 0 | Output pixel width after resampling (0 = keep cropped width) |
+| target_height | INT | 0 | Output pixel height after resampling (0 = keep cropped height) |
+| interpolation | dropdown | bilinear | Resampling interpolation: bilinear, nearest, or bicubic |
+
+## Limitations
+
+- The crop region must have non-zero width and height; an error is raised otherwise.
+- If only one of target_width or target_height is set, the other dimension is computed to preserve aspect ratio.
+- Physical extents are scaled proportionally when resampling.