add help docs and ?

docs/nodes/Colormap Adjust.md

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+# Colormap Adjust
+
+Adjust how a DATA_FIELD maps into its colormap without changing the underlying data. offset and scale operate in normalized display coordinates; Auto resets to the full data range.
+
+## Inputs
+
+| Name | Type | Required | Description |
+|------|------|----------|-------------|
+| field | DATA_FIELD | Yes | Input field whose colormap mapping is adjusted |
+
+## Outputs
+
+| Name | Type | Description |
+|------|------|-------------|
+| field | DATA_FIELD | Field with updated display_offset and display_scale metadata |
+
+## Controls
+
+| Name | Type | Default | Description |
+|------|------|---------|-------------|
+| offset | FLOAT | 0.0 | Shift the colormap center in normalized units (−1 to 1) |
+| scale | FLOAT | 1.0 | Zoom the colormap range (0.05–4.0); values below 1 stretch contrast |
+| auto | BUTTON | — | Reset offset to 0 and scale to 1 (full data range) |
+
+## Limitations
+
+- Only the display mapping metadata is changed; raw data values are unaffected.
+- Scale must be positive and finite; zero or negative values raise an error.