add help docs and ?

docs/nodes/Image.md

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+# Image
+
+Load any supported file. SPM formats (.gwy, .sxm, .ibw) and HDF5 (.h5, .hdf5) provide calibrated dimensions; each channel gets its own output. Images (.png, .tiff, .jpg) and arrays (.npy, .npz) are loaded as uncalibrated fields.
+
+## Inputs
+
+| Name | Type | Required | Description |
+|------|------|----------|-------------|
+| path | FILE_PATH | No | File path input from a Folder node or other path source; overrides the filename widget |
+
+## Outputs
+
+| Name | Type | Description |
+|------|------|-------------|
+| path | FILE_PATH | Resolved absolute file path |
+| field | DATA_FIELD | Loaded data field (one per channel for multi-channel formats) |
+
+## Controls
+
+| Name | Type | Default | Description |
+|------|------|---------|-------------|
+| filename | FILE_PICKER | "" | Path to the file to load; hidden when path input is connected |
+| colormap | dropdown | viridis | Colormap applied to the loaded field; hidden when colormap_map is connected |
+
+## Limitations
+
+- Uncalibrated formats (images, arrays) emit a warning and produce fields without physical dimensions.
+- Multi-channel files (e.g. .gwy with multiple data channels) produce one DATA_FIELD output socket per channel; the socket count is determined at load time.