SyclReproSum 1.2.6

SyclReproSum 1.2.6 fixes a reproducibility issue in generic SPIR float
conversion. On CPU OpenCL, some high-fold sums and cumulative sums could differ
by one ULP between work-group sizes.

The library remains header-only, C++17, and source-compatible with version
1.2.5.

Highlights

• Guard generic SPIR float conversion against the observed CPU OpenCL JIT
  rounding difference.
• Preserve the existing arithmetic order and native NVIDIA and AMD paths.
• Add regression coverage for sums and cumulative sums across work-group sizes,
  fold counts, input permutations, scaling, in-place scans, and devices.
• Update the encoded library version to 1.2.6.
• Refresh the README benchmark results.

Testing and validation

• All 768 tests passed on the four-device NVIDIA, AMD, Intel GPU, and Intel CPU
  system.
• All 567 correctness tests passed on the Intel Arc Pro B70, Intel iGPU, and
  Intel CPU system.
• Hostile and unsafe floating-point environment validation passed.

Compatibility and upgrade notes

• Existing adn::sum, adn::cumsum, and adn::validate_environment calls
  require no changes.
• Recompile applications after updating repro_sum.hpp.
• Native NVIDIA and AMD conversion paths are unchanged.

Full comparison:
v1.2.5...v1.2.6

Attribution and license

SyclReproSum is licensed under the BSD 3-Clause License. Portions of the binned
accumulator primitives are adapted from ReproBLAS. See THIRD_PARTY_NOTICES
for details.