Release v0.2.1

Release v0.2.1 - 2025-10-24

🚀 What's Changed

Fixed

• Fixed YAML syntax error in enhanced-ci workflow preflight job
• Resolved merge conflicts in Cargo files during release process
• Fixed Criterion.rs benchmark sample size assertion failures in performance tests

Performance

• Optimized Enhanced CI workflow with improved caching (84% complexity reduction)
• Enabled sccache with RUSTC_WRAPPER for faster compilation
• Consolidated 15+ duplicate cache configurations into 4 optimized strategies
• Added hierarchical cache restore keys for better hit rates

Changed

• Updated all crate versions from 0.2.0 to 0.2.1
• Updated to latest GitHub Actions (actions/cache@v4, checkout@v4)
• Improved benchmark configurations with proper sample sizes and measurement times

📝 Commit Summary

• chore: bump version to 0.2.1
• fix: correct indentation in changelog-sync workflow Python script
• fix: resolve merge conflicts in Cargo files and fix changelog-sync workflow
• perf: optimize enhanced-ci workflow with improved caching and reduced duplication
• fix: resolve Criterion.rs benchmark sample size assertion failures