Decode_A8_ExpandsSingleByteToRgbaWithAlphaInAllChannels renamed to
Decode_A8_NonAdditive_ProducesWhitePlusAlpha with updated expectations
(R=G=B=255, A=val) matching the new default isAdditive:false WB semantics.
Decode_CustomLscapeAlpha_TreatedIdenticallyToA8 updated to the same
non-additive expectation (255,255,255,val).
New test Decode_A8_Additive_ReplicatesByteToAllChannels documents the
isAdditive:true path (R=G=B=A=val) used by TerrainAtlas alpha maps.
8 pre-existing failures unchanged. 883 pass.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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