Add auditable spatial transform field Op - #320
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Summary
Adds a small SciJava/ImageJ2 operation for auditing two-dimensional differentiable coordinate transforms over a deterministic spatial grid.
The audit derives:
The implementation delegates Jacobian computation to the existing ImgLib2 DifferentiableRealTransform API and does not introduce a new transformation or differentiation algorithm.
Validation
The focused tests cover identity, affine transforms, nonlinear thin-plate-spline deformation, singular Jacobians, validity thresholds, deterministic sampling, immutability, and aggregate metrics.
Scope
This PR intentionally adds only the audit abstraction and its tests. It does not modify existing ImageJ2 behavior.