Add production-ready randomness implementation guide #2698
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This converts the coin-flip example into an advanced tutorial covering secure randomness patterns for production smart contracts.
Changes:
Developed comprehensive guide for blockchain randomness implementation
Detailed attack vectors and mitigation strategies (front-running, validator manipulation)
Added advanced patterns: commit-reveal, oracle integration, multi-signature randomness
Included statistical testing framework and performance optimization techniques
Covered migration strategies and real-world application guidelines
Provided risk assessment matrix and implementation checklist for production deployment
Addresses the DevRel initiative to transform examples into practical tutorials for experienced developers.