adding more nodes

docs/nodes/Image Stitch.md

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+# Image Stitch
+
+Combine two overlapping scans into a single image. Uses cross-correlation to align the images and blends the overlap region. Equivalent to Gwyddion's merge.c / stitch.c modules.
+
+## Inputs
+
+| Name | Type | Required | Description |
+|------|------|----------|-------------|
+| field_a | DATA_FIELD | Yes | First (reference) field |
+| field_b | DATA_FIELD | Yes | Second field to stitch onto field_a |
+
+## Outputs
+
+| Name | Type | Description |
+|------|------|-------------|
+| stitched | DATA_FIELD | Combined field |
+
+## Controls
+
+| Name | Type | Default | Description |
+|------|------|---------|-------------|
+| direction | dropdown | auto | How field_b is positioned relative to field_a: right, below, or auto (determined by cross-correlation) |
+| blend | dropdown | linear | Overlap blending: linear (smooth transition) or none (hard cut) |
+
+## Notes
+
+- Auto direction uses cross-correlation to determine whether field_b is to the right or below field_a.
+- Linear blending produces a smooth transition in the overlap region, avoiding visible seams.
+- Both fields should have the same pixel size (dx, dy) for correct physical dimensions in the output.
+- The output field's physical dimensions are updated to reflect the combined area.