Replace the flat binary .paint format with a folder per painting under
Paintings/<key>/: albedo/emission as sRGB PNGs, the packed MSO map split
into human-readable metallic/occlusion/smoothness grayscale PNGs, and the
non-baked scalars (name, size, emission intensity, camo/height knobs) in
painting.json. MSO.B is always 0 (pack shader), so the split round-trips
losslessly with no alpha ambiguity. Public API (SavePaintAs/LoadPaintByName/
ListSavedPaintings/PaintExists/DeletePaint) and the network snapshot path
(WriteCanonicalMaps/ReadCanonicalMaps) are unchanged.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
adminandClaude Opus 4.8
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