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v0.2.2 — CPU-runnable quickstart (CI-executed) + teaching asserts

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@pjordanandrsn pjordanandrsn released this 21 Jul 01:51

docs/tests only, no kernel-math changes.

  • CPU-runnable README quickstart (NF4 roundtrip, MXFP4 roundtrip, provenance-in-4-lines), extracted and executed by CI (test_readme_cpu_block.py) so examples can't drift from the API.
  • Taught CPU refusal: gemm_4bit_grouped on CPU now names the CUDA requirement and points at dequant_ref (pinned by test_cpu_refusal.py; exempts TRITON_INTERPRET=1).
  • Docstring examples on the five surface functions; quantize_pack_nf4 teaches on non-2-D input.
  • Two courtesy clauses (Unsloth bf16-training context; Axolotl/PEFT factual phrasing).

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