Card: standardized form with hero

Update card

Uploaded using `kernel-builder`.

Uploaded using `kernel-builder`.

Standardize card: usage-first

Tests reference the kernel-quantized operands; reciprocal quantization diverges one ulp at ties

Measured performance

Uploaded using `kernel-builder`.

Tighten usage docs

Uploaded using `kernel-builder`.

Kernel name uses dashes per builder naming rules

bitnet-cpu v1: kernel-builder source tree

initial commit