adding more nodes

docs/nodes/Tilt.md

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+# Tilt
+
+Apply or remove a linear tilt (planar slope) from a DATA_FIELD. The tilt is defined by slope values in data units per physical unit along the x and y directions. Equivalent to Gwyddion's `tilt.c` module.
+
+## Inputs
+
+| Name | Type | Required | Description |
+|------|------|----------|-------------|
+| field | DATA_FIELD | Yes | Input field |
+
+## Outputs
+
+| Name | Type | Description |
+|------|------|-------------|
+| tilted | DATA_FIELD | Field with tilt applied or removed |
+
+## Controls
+
+| Name | Type | Default | Description |
+|------|------|---------|-------------|
+| slope_x | FLOAT | 0.0 | Slope along the x axis in data units per physical unit (e.g. nm/um) |
+| slope_y | FLOAT | 0.0 | Slope along the y axis in data units per physical unit (e.g. nm/um) |
+| mode | dropdown | subtract | Operation mode: subtract (remove tilt) or add (apply tilt) |
+
+## Notes
+
+- In subtract mode the specified planar slope is removed from the field, useful for compensating known sample tilt.
+- In add mode the slope is added, useful for simulating a tilted surface or restoring a previously subtracted tilt.
+- The slope values are in data-unit per physical-unit (e.g. nm/um). The actual z-change per pixel depends on the field's physical pixel size.
+- For leveling an unknown tilt, consider Plane Level instead, which automatically fits and removes the best-fit plane.