Add optional JAX backend, migrate Poetry->uv, and benchmark JAX vs NumPy#19
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JAX backend: optional backend="jax" (Literal, default "numpy") routing array ops through numpy/jax.numpy so per-fold training_XTX/XTY/XTX_XTY/statistics trace under jax.jit and batch over folds with jax.vmap on CPU/GPU/TPU. Trace-safe (tracer-gated raises keyed on val_indices, maximum/where std clamp, auto x64); numpy backend byte-identical and perf-neutral. Type hints admit jax values (FloatDType via a TYPE_CHECKING npt.DTypeLike alias). Tests parametrized over both backends + jit/vmap trace tests + degenerate-fold + jax-absent ImportError. Tooling: migrate Poetry->uv (PEP 621 [project], hatchling, PEP 735 dependency-groups; uv.lock replaces poetry.lock; ruff replaces flake8 for the build lint); version 3.1.6 -> 3.2.0. Benchmarks: optional jax backend + JAX execution-mode variants (no-/cold-/warm-JIT, CPU/GPU); two new multi-threaded CVMatrix-only figures (NumPy vs warm JAX; JIT modes).
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JAX backend: optional backend="jax" (Literal, default "numpy") routing array ops through numpy/jax.numpy so per-fold training_XTX/XTY/XTX_XTY/statistics trace under jax.jit and batch over folds with jax.vmap on CPU/GPU/TPU. Trace-safe (tracer-gated raises keyed on val_indices, maximum/where std clamp, auto x64); numpy backend byte-identical and perf-neutral. Type hints admit jax values (FloatDType via a TYPE_CHECKING npt.DTypeLike alias). Tests parametrized over both backends + jit/vmap trace tests + degenerate-fold + jax-absent ImportError.
Tooling: migrate Poetry->uv (PEP 621 [project], hatchling, PEP 735 dependency-groups; uv.lock replaces poetry.lock; ruff replaces flake8 for the build lint); version 3.1.6 -> 3.2.0.
Benchmarks: optional jax backend + JAX execution-mode variants (no-/cold-/warm-JIT, CPU/GPU); two new multi-threaded CVMatrix-only figures (NumPy vs warm JAX; JIT modes).