Read DNG 1.6 semantic masks (SemanticName, SemanticInstanceID,
MaskSubArea; any coding the tile/strip reader decodes, e.g. ProRAW's
lossy-JPEG matte) with lightcraft_raw::semantic_masks, map them onto the
developed image, and carry Apple's sky / portrait / skin / hair / teeth /
glasses mattes in SourceInfo::mattes (SourceInfo is no longer Copy).
Sky, Subject, Background and People components sample them through
orientation, warp (Warp::frame, as geometry.rs) and crop like the image,
so preview = export, instead of the heuristics; files without mattes
render as before. Malformed mask IFDs are skipped, and only the first
MAX_MASKS mask IFDs are decoded, so a file full of them costs bounded
work. The render cache version is bumped once, in the white-balance commit.
The corpus test reads corpus/raw/dng-apple-iphone12pro-proraw.dng, the
name `cargo xtask corpus` downloads it under.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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