compare-dirs gains --artifacts changed|always: 'always' also writes the
side-by-side triptych + heatmap for pairs that PASS the floor (blue-grey
UNCHANGED caption), so a human can eyeball old-vs-new without a failing
gate. The gating scripts keep the default (empty diff dir = green);
3d:review writes the full 47-pair set to output/diff/parity-review/.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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