add a few more nodes

docs/missing_gwyddion_features.md

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+# Missing Gwyddion Features
+
+Gwyddion 2D image/surface processing features not yet implemented in tono. Excludes force curves, force volume, spectroscopy, volume data, XYZ data, graph operations, and file I/O.
+
+## Leveling / Background Removal
+
+- [x] **Arc Revolve** — Subtract cylindrical arc background fitted by revolving an arc under the data
+- [x] **Sphere Revolve** — Subtract spherical cap background
+- [x] **Unrotate** — Auto-detect and correct in-plane scan rotation by finding dominant feature directions
+- [x] **Level Rotate** — Level by physically rotating the data plane rather than subtracting a polynomial
+- [x] **Zero Mean Value** — Shift all values so the mean is exactly zero (pure offset, no plane fit)
+- [x] **Zero Maximum Value** — Shift all values so the maximum is exactly zero
+
+## Filtering / Signal Processing
+
+- [ ] **2D CWT** — Continuous Wavelet Transform for scale-space analysis
+- [ ] **XY Denoise** — Denoise by combining two orthogonal scans (forward/backward or horizontal/vertical)
+- [ ] **Rank Presentation** — Rank transform image for local contrast enhancement
+- [ ] **Radial Smoothing** — Smooth data in polar coordinates, averaging along radial or angular direction
+- [ ] **Convolve Two Images** — Convolve two separate data channels together
+
+## Line Correction / Scan Artifacts
+
+- [ ] **Step Block Correction** — Correct vertical step offsets between scan lines by block-matching
+- [ ] **Good Mean Profile** — Compute a high-quality average scan line from repeated scans
+- [ ] **Align Rows (extended methods)** — Modus and Gaussian-weighted row alignment beyond tono's current set
+
+## Correction / Restoration
+
+- [ ] **Fractal Correction** — Fill masked/bad pixels using fractal interpolation (alternative to Laplace)
+- [ ] **Correlation Averaging** — Average repeated similar structures using autocorrelation alignment
+- [ ] **Coerce** — Force data to match the histogram distribution of another dataset
+- [ ] **Periodic Translate** — Translate image data treating the field as periodic (wrap-around shift)
+- [ ] **Reorder** — Reorder pixel rows/columns (interleaved to sequential, reverse scan, etc.)
+
+## Statistical Analysis
+
+- [ ] **Transfer Function Fit** — Fit PSF from a known reference image and a measured blurred image
+- [ ] **Transfer Function Guess** — Estimate PSF from a single image without a reference
+- [ ] **Angle Distribution** — Distribution of surface normal angles (distinct from slope distribution)
+
+## Grain Operations
+
+- [ ] **Otsu Threshold** — Automated grain/mask threshold using Otsu's method
+- [ ] **Remove Edge-Touching Grains** — Remove all grains touching the image border from a mask
+- [ ] **Grain Selection Shapes** — Create geometric selections (bounding boxes, inscribed discs, etc.) from grain masks
+
+## Mask Operations
+
+- [ ] **Mask Thin** — Morphological thinning to single-pixel-wide skeletons
+- [ ] **Mask Distribute** — Copy/distribute a mask to multiple channels simultaneously
+- [ ] **Mark With** — Create or modify a mask using arithmetic conditions on other channels
+
+## Basic Operations
+
+- [ ] **Invert Value** — Flip heights (z to -z)
+- [ ] **Log Scale Presentation** — Log-scaled presentation layer without modifying source data
+- [ ] **Limit Range** — Clamp data values to a specified min/max range
+- [ ] **Square Samples** — Resample so pixels are physically square (equal x/y size)
+- [ ] **Null Offsets** — Zero out the lateral (XY) origin offsets
+
+## SPM-Specific Modes
+
+- [ ] **MFM Field Simulation** — Simulate magnetic stray field above perpendicular media
+- [ ] **MFM Parallel Media** — Simulate MFM signal for in-plane magnetic media
+- [ ] **MFM Lift Shift** — Simulate MFM signal change when lift height changes
+- [ ] **MFM Lift Estimate** — Estimate lift height difference from data blur
+- [ ] **MFM Force Gradient** — Convert MFM raw data to force gradient units
+- [ ] **SMM Apply Calibration** — Apply Scanning Microwave Microscopy calibration coefficients
+
+## Synthetic Surface Generators
+
+Tono has one generic Synthetic Surface node. Gwyddion has ~20+ specialized generators:
+
+- [ ] **Fractional Brownian Motion** — fBm rough surfaces with controlled Hurst exponent
+- [ ] **Spectral Synthesis** — PSD-specified random rough surfaces
+- [ ] **Lattice** — Crystalline lattice surface with defects
+- [ ] **Objects** — Randomly placed 3D objects (spheres, pyramids, etc.)
+- [ ] **Patterns** — Geometric patterns (staircase, gratings, etc.)
+- [ ] **Waves** — Sinusoidal/wave patterns
+- [ ] **Noise** — Uncorrelated random noise with configurable distribution
+- [ ] **Line Noise** — Synthetic scan-line noise/steps/scars for testing
+- [ ] **Fibres** — Random fibre network surfaces
+- [ ] **Domain Walls** — Phase-separated domain structures
+- [ ] **Columnar Growth** — Columnar thin-film growth simulation
+- [ ] **Ball Deposition** — Random ballistic deposition growth
+- [ ] **Particle Deposition** — Dynamical particle deposition model
+- [ ] **Rod Deposition** — Rod-like particle deposition
+- [ ] **Diffusion** — Diffusion-limited aggregation surfaces
+- [ ] **Discs** — Random overlapping disc surfaces
+- [ ] **CPDE / Turing** — Reaction-diffusion / Turing pattern surfaces
+- [ ] **Sand Dunes** — Aeolian sand transport simulation
+- [ ] **Annealing Lattice Gas** — Annealed lattice-gas model textures
+- [ ] **Phase Separation** — Spinodal decomposition textures
+- [ ] **Pileup** — Piled-up ellipsoids or bars
+- [ ] **Plateaus** — Stacked random plateau/terrace structures
+- [ ] **Film Residue** — Residue left after simulated film removal
+- [ ] **Wetting Front** — Propagating wetting front simulation