MedOtter ops run (bench-fleet D1, 2026-09-08): the scoring engine reads NIfTI only, so every image/segmentation volume in this repo now has a .nii.gz copy beside the original. Values are byte-preserved (round-trip asserted), array order is the source's own (Z, Y, X), affine is identity, instance ids are unchanged. No original file was deleted or overwritten. Per-file provenance: conversion.json; summary: CONVERSION.md.
