CLAUDE: -CUAS-RT-RENDER-EVAL: log / log-diff / diff hyperstack (Andrey's spec)

New evaluation product with the RT render (replaces the manual
run-UM-in-ImageJ workflow): merged component only, z = robust all-scenes
average + each scene, t ordered for ImageJ auto-range: 1) pixel LoG (the
pre-DNN kernel, LINEAR) of the image, 2) LoG of (scene - average),
3) plain (scene - average); t2/t3 are 0 for the average frame. The
average is the new robust one (edge-eroded + outlier-rejected),
extracted into shared helpers (erodedMasks/robustAverage) used by both
saveRenderHyper and the EVAL builder.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>