paired-eval 0.2.0

paired-eval 0.2.0

Added

• paired_eval module: a single import surface matching the repository name (import paired_eval as pe), re-exporting
  the public API of the implementation modules, plus pe.demo() / python3 paired_eval.py — an offline demo that
  prints a complete report from two stub systems in under a second.
• claim_eval.fmt_p: report p-values below 1e-4 in scientific notation instead of 0.0000.
• Report text in English: set_language("en") (or lang="en" on interpret / report, --lang en on the demo).
  The Chinese strings are byte-identical to before; a test asserts the English output contains no CJK
  characters and that both languages expose the same placeholders.

Changed

• README rewritten from the user's perspective (why / install / ten-second demo / your own tasks / how to read the
  report / API / scope). The demo output pasted in both READMEs is asserted equal to the actual output by a test, and
  every code block is executed against the real API.
• README gains a flow diagram and a grounded "how it relates to other tools" section (lm-evaluation-harness,
  Inspect, promptfoo, openai/evals — descriptions taken from their own READMEs).

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Verified on this tag: full fast suite on Python 3.9 / 3.10 / 3.12 / 3.13 (locally and in CI), hook integration, power calibration, hand-picked mutants; changed-line mutation ratchet 4/4 killed.