Security and design review for v2 release

[darccio]

This comprehensive review document provides:

Security Review:

• No critical vulnerabilities found
• Identified 3 medium-risk issues (UnsafeAddr usage, recursion depth, panic potential)
• Recommendations for security hardening in v2

Design & Architecture Review:

• v2 shows 4x performance improvement (267.5ns → 67-74ns/op)
• Zero allocations in v2 (4 allocs/op → 0 allocs/op)
• Generics-based API provides compile-time type safety
• Concrete error types with field path context

Code Quality Review:

• 85.4% test coverage with 100+ regression tests
• Identified code smells (complex functions, magic numbers)
• Recommendations for refactoring and improved maintainability

Performance Analysis:

• Detailed benchmark comparison v1 vs v2
• Identified bottlenecks (Config allocation, reflection overhead)
• Optimization recommendations for complete v2 implementation

Developer Experience Review:

• Current API analysis with usability improvements
• Documentation recommendations (MIGRATION.md, FAQ.md, etc.)
• Better error messages with field paths
• Debug tooling suggestions

Test Coverage Review:

• Strong issue-based regression testing
• Recommendations for fuzz testing, mutation testing, property-based testing
• Concurrency safety testing needs

v2 Release Roadmap:

• 5-phase plan (8 weeks to stable release)
• Phase 1: Foundation - Complete feature parity
• Phase 2: Quality & Safety - Hardening and testing
• Phase 3: Documentation & DevEx - Migration guides
• Phase 4: Beta Release - Community feedback
• Phase 5: Stable Release - Production-ready v2

Migration Strategy:

• Parallel v1/v2 releases for gradual adoption
• Automated migration tooling
• 12-month v1 support window
• Backward-compatible API options

Success Metrics:

• Technical: 90%+ coverage, 0 allocs, <75ns/op
• Adoption: 25% of v1 users in 6 months
• Business: Major dependents migrated, community growth

Next Actions:

• Community RFC for feedback
• Start Phase 1 implementation
• Set up tracking for v2 milestones