Merged COMPARISON.md into the review README as a generated section between
<!-- blender-comparison:begin/end --> markers, so there is one place to look and one place
to sign off. Tools/build_comparison_md.py rewrites only that block - the hand-written
sections around it are untouched - and formats the file with prettier afterwards, because a
generated table is never byte-identical to prettier's output and the repo gates on
--check.
Run it after every capture or Blender render; it is the routine that keeps the page current
with new images rather than a one-off export.
