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* PNG: keep a stereo file's sTER pairing on save (#6063) Read the sTER chunk (PNG Extensions 1.4.0 §3.6) when a PNG opens, store it on the document's FileEncoding, and write it back when saving, so a stereo PNG still says it is a stereo pair. Covers the ordinary and the palette PNG encoders, including interlaced output. * io tests: pass the new sTER argument to encode_png_indexed Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: highperfocused <highperfocused@pm.me> Co-authored-by: Brandon Thomas <echelon@gmail.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>