davidbyttow / govips / 22528477771

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Preserve loop/delay metadata in RemoveMetadata, add Loop API (#381) (#503)

RemoveMetadata() was stripping the "delay" and "loop" animation metadata
because they were not in the technicalMetadata preserve list. This caused
GIF-to-WebP conversions to lose frame timing and loop count.

Changes:
- Add "delay" and "loop" to technicalMetadata so they survive RemoveMetadata()
- Add get_image_loop/set_image_loop C bridge functions
- Add Loop() and SetLoop() public methods on ImageRef

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

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