[Kyle-Ye]

Add named CGColorSpace support and the CGColor APIs needed to construct and convert colors between sRGB, extended and linear sRGB, Display P3, and generic RGB/gray spaces. Preserve extended component ranges, color-space identity, and alpha-copy behavior.

Add shared compatibility coverage for conversion boundaries, grayscale handling, and gamut clipping. The 29 CGColor tests pass against native CoreGraphics and OpenCoreGraphics on macOS, and against OpenCoreGraphics on Linux. iOS and visionOS Simulator type checks also pass.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.32%. Comparing base (0d7a0d0) to head (5bc6205).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #12      +/-   ##
==========================================
+ Coverage   74.83%   81.32%   +6.49%     
==========================================
  Files          16       19       +3     
  Lines         751     1012     +261     
==========================================
+ Hits          562      823     +261     
  Misses        189      189              

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