The Fujifilm entropy reader read each unary prefix one bit at a time and refilled
its accumulator a byte at a time. It now keeps up to 64 bits buffered and counts a
prefix's zeros with leading_zeros, failing exactly where reading bit by bit would
(escape limit, end of stream). A property test checks it against reading bit by bit.
Sensor arrays are unchanged bit for bit: the 17 reference arrays of
corpus_fujifilm_compressed_samples, plus decode checksums of 20 X-Trans CMOS 4 files.
Decode on an Apple M2: X-S10 lossless 265 -> 226 ms, X-H2 448 -> 378 ms,
GFX 100 762 -> 644 ms (docs/raf-compression.md).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
