Context-mixing compressor for time_msc/bid/ask tick history:
nibble-block hashed counters, two-layer logistic mixer, two APMs and a
32-bit binary arithmetic coder. Prices are mapped to exact integers
(auto-detected digits, common price step, optional decimal sub-grid),
irregular doubles are escaped and stored raw, so the round trip is
bit-exact. Each chunk is self-contained and carries a checksum.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
