adding more nodes

docs/nodes/Drift Correction.md

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+# Drift Correction
+
+Compensate for thermal or piezo drift between scan lines. Estimates inter-row displacement via cross-correlation and shifts rows to align them. Equivalent to Gwyddion's drift.c module.
+
+## Inputs
+
+| Name | Type | Required | Description |
+|------|------|----------|-------------|
+| field | DATA_FIELD | Yes | Input field with drift artifacts |
+
+## Outputs
+
+| Name | Type | Description |
+|------|------|-------------|
+| corrected | DATA_FIELD | Drift-corrected field |
+
+## Controls
+
+| Name | Type | Default | Description |
+|------|------|---------|-------------|
+| reference | dropdown | previous_row | Reference for drift estimation: previous_row (local) or mean_row (global average) |
+| direction | dropdown | horizontal | Drift direction to correct: horizontal or vertical |
+
+## Notes
+
+- Use previous_row for slow, cumulative drift. Use mean_row when drift is more random row-to-row.
+- Apply after Line Correction for best results.
+- Vertical direction transposes the correction axis — useful for column-scanned data.