stillwater-sc / universal / 22332900479

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V3.99: supporting cross-platform BlockType == uint64_t (#511)

* Incrementing SEMVER to v3.99

* Fix blockbinary operator[] vs test() misuse in posit components

blockbinary::operator[] is a block/limb index accessor, not a bit
index accessor. Four locations used it with bit indices, causing
stack-buffer-overflow for posit configurations where fbits > nrBlocks
(e.g., posit<16,1,uint8_t> with fbits=12 and only 2 blocks).

Fixed positFraction::operator<<, get_fixed_point(), denormalize(),
and posit reciprocal sign extraction to use _block.test(bitIndex).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Add comprehensive documentation for all number systems

Why/what/how markdown guides for each of the 29 number systems
with regression tests, covering integer, fixed-point, rational,
configurable floats, posit family, logarithmic, multi-component
extended precision, block-scaled AI formats, interval arithmetic,
and compressed floating-point. Includes README.md index with
category tables and selection guide.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* adding details about uint32_t for limb carry arithmetic

* adding uint64_t limb support

* fix headers in SORN tests

* Fix nibble() UB in all block types for uint64_t limbs

0x0Fu is a 32-bit unsigned int, so shifting it by nibbleIndexInWord*4
when nibbleIndexInWord >= 8 (i.e., shift >= 32) is undefined behavior.
On MSVC this caused corrupt to_hex() output and cascading test failures
in bb_uint64_limbs. Fix by casting to bt before shifting, ensuring the
shift operates on the block type width.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Fix MSVC intrinsic output via reference-derived pointers in carry.hpp

_umul128, _addcarry_u64, and _subborrow_u64 write results through
pointer parameters. When these pointers were derived from reference
parameters via reinterpret_cast, the MSVC optimizer could lose the
writes after inlining, causing mul128 to always return hi=0. Thi... (continued)

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