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目的
Plan B の 0 番 PR。依存ゼロの length-variance 指標 (len_var) を追加して
CI/レビュー フローを軽量に検証します。
変更点
metrics/len_var/scorer.py… 本体 (純 Python)metrics/len_var/tests/… pytest 2 ケースmetrics/len_var/README.md… 数式と暫定しきい値metrics/__init__.py,metrics/len_var/__init__.py動作確認