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Single-strip ORFs at 12.8 bits per pixel are 16-byte blocks: ten little-endian 12-bit samples in bytes 0..14 plus a zero pad byte. Main routed them through the XZ-2 12-bit word path (stripes, magenta cast). New branch before it; the exactly 12.0 bpp XZ-2 branch is unchanged. Layout measured on CC0 files (log and scripts in data/testing/retry-olympus-e300 and tools/retry-olympus-e300). RENDER_CACHE_VERSION bumped to 30 (open PRs use up to 29; adjust at merge).