docs(mincut): SEO optimization and factual corrections

- Fix author attribution: El-Hayek, Henzinger, Li (not Jin et al.)
- Add limitations box clarifying cut size regime (λ > log^c n)
- Tighten claims: "production-oriented" instead of "world's first"
- Add reproducibility header to benchmarks (env, commit, command)
- Add 8KB compile-time verification links
- Update positioning: "continuous structural integrity"
- Streamline content while keeping full essay in README

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: ruvnet