test: add 27 sequential-value test images for bit-error detection

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Generated by gen_seq_images.py using manual TIFF writer with packed
bit streams matching TIFF spec. Each 16x16 image has cycling 0..max
values so any bit-level decode error changes the checksum.

Test matrix:
- Sub-byte BlackIsZero: 3/5/7-bit
- Sub-byte WhiteIsZero: 3/5/6/7-bit
- Extended BlackIsZero: 10/12/14/24-bit
- Extended WhiteIsZero: 10/12/14/24-bit
- Extended HPredict: 10/12/14/24-bit
- RGB contiguous: 10/12/14/24-bit
- RGB planar: 10/12/14/24-bit (first plane only via read_image)

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Lilith River committed 2026-03-10 06:02:19 -06:00

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commit 5090003bda

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tests/images/seq-1c-10b.tiff

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