Write the registration result as Transform.h5 through the itktransform backend

Drop the mask key from Patch, which konfai never binds

A preset declares its displacement field, and only that

Add per-app icons and declare the registration task

Require impact_reg_konfai 1.7.0 for the OME-Zarr displacement field

Drop the placeholder checkpoint; these engines are weightless

Move engine code to impact_reg_konfai.models; keep only config + weights

fix(FireANTs): install fireants without its broken simpleitk pin; optional fused kernels (opt-in, pure-torch by default)

Add FireANTs presets (Affine/SyN/IMPACT); optional-mask defaults; elastix skips non-restrictive masks