Move brightness out of the half-lambert diffuse term to a final exposure
multiply on the whole shaded body color (diffuse + GI + specular), and add
a saturation grade (0 = neutral, -1 = grayscale, >0 = boosted) on the same
final stage. Saturation rides as a 4th component on CamoKnobs (Vector3 ->
Vector4) so it inherits all three persistence paths: HUD JSON, network
replication (_camo NetworkVariable), and painting-slot metadata. Wires the
renamed Slider_Brightness and new Slider_Saturation. Bumps HudFileVersion
and PaintMetaVersion with load-time remaps so existing paintings keep their
look (old 1=neutral saturation remaps to 0=neutral).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
adminandClaude Opus 4.8
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