Benchmark API and Entrypoints

dzmingli_vs_floating compares DzmingLi/decimal@0.2.2 and Luna-Flow/floating/decimal_gda@0.7.1 on shared neutral decimal fixtures. The package exposes fixture generation, exact-finite BigInt reference operations, adapters, Mare Mark execution, and report rendering.

The scalable overlap covers 19 operations: the four basic operations, divide-integer, remainder, integer power, FMA, exact square root, unary plus/minus/abs, quantize, rescale, scaleb, reduce, both to-integral variants, and compare. Official decTest additionally covers shared exp, ln, and log10 semantics.

• src/dzmingli_vs_floating/bench: scaling run through 10,000 digits, plus non-multiplication stress through 20,000 digits.
• src/dzmingli_vs_floating/bench_common: 1, 4, 8, 16, 18, and 28 digits.
• tools/run_dzmingli_dectest_audit.sh: pinned official GDA decTest audit.

The runners emit validation, calibration, observation, summary, and comparison JSONL records and write self-contained HTML reports under artifacts/.