Pure file moves: the canvas baseline set (331 PNGs) is deleted, the DOM
set becomes tests/baseline-screenshots/, and the DOM pcbnew reference
image becomes wizard-04-finish-headless.png. 73 kicad-flow baselines
existed only on the canvas side; they are regenerated from a green DOM
run in a follow-up commit.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>