Restore 8acfab54 for impact-reg-konfai 1.8.6

Presets for impact-reg-konfai 1.8.7: one IMPACT loss, sized from their declared cost

Write the configs in KonfAI 1.8.7's spellings

feat: no VRAM plan, every preset leaves its patch free and blends its tiles

Drop the config keys konfai 1.8 no longer reads

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