Correct GIF bypass rationale in DocImage and ImageGallery comments#419
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Astro's Sharp pipeline already preserves animated GIFs (passes them through as .gif on disk). The real failure mode is Sharp reading every frame (`pages: -1`) and tripping `limitInputPixels` on large multi-frame GIFs — that is why we bypass `getImage` for `.gif` files.
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Summary
Follow-up to #417. The comments justified the GIF bypass with "WebP re-encode drops animation frames", but verifying against
dist/shows Astro's Sharp pipeline already passes animated GIFs through unchanged (output is byte-identical to source, all frames preserved). The real failure mode that #417 fixed is Sharp reading every frame (pages: -1) and trippinglimitInputPixelson large multi-frame GIFs — comments now reflect that.No behavior change.