chore: add lean4-benchmarks skill for Claude Code This PR moves benchmark documentation from CLAUDE.md into a dedicated project-level skill at .claude/skills/lean4-benchmarks/SKILL.md, covering the measurement pipeline, variable-size benchmarks, JSONL format, custom metrics, and combine.py behavior. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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