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feat(hdr): add HDR image support — probe, extract, and composite#314

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vanceingalls wants to merge 1 commit intofeat/hdr-layered-compositingfrom
feat/hdr-image-support
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feat(hdr): add HDR image support — probe, extract, and composite#314
vanceingalls wants to merge 1 commit intofeat/hdr-layered-compositingfrom
feat/hdr-image-support

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ImageElement type and parseImageElements() parser for <img> elements.
When --hdr is set, images are probed alongside videos for HDR color
space. HDR images get single-frame 16-bit PNG extraction and route
through the existing blitHdrVideoLayer path. SDR images unchanged.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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