v8.2.1

Added

• tests/lmm_accel/test_bgen_decode_properties.py is a Hypothesis property
  test for the C BGEN layout-2 decoder. It generates truncated, padded,
  garbage and zlib-mislabelled blocks, and blocks with one header field just
  out of range, and requires the decoder to reject exactly what the NumPy
  oracle rejects and to match it bit for bit on everything else.

Changed

• GEMMA_EQUIVALENCE.md and assumption 7 of
  GEMMA_NUMERICAL_EQUIVALENCE_BOUND.md name the jamma-lean theorems behind
  their p-value claims. GEMMA_DIVERGENCES.md §6 counts the SNPs whose lambda
  error exceeds lambda_rtol: 3 NumPy and 2 native, all at n = 30 to 100.

• Dependency and CI-action bumps (Dependabot): google/osv-scanner-action
  2.5.1 → 2.6.0, docker/build-push-action 7.3.0 → 7.4.0,
  docker/setup-qemu-action 4.3.0 → 4.4.0, docker/setup-buildx-action
  4.3.0 → 4.4.1, build backend hatchling 1.32.0 → 1.32.3, dev dependency
  pyrefly 1.3.0 → 1.3.1, and the container's threadpoolctl 3.6.0 → 3.7.0.
  No source or numerical-result change.

Fixed

• The BGEN decoder property test now catches a dropped B >= 1 check. It set
  the bit depth to 0 but kept the data bytes, so the size check rejected the
  block first and a decoder without the check still passed.