Phase 3: Fix A4/A5 + Complete Result/Option Implementation

- Advanced type inference with go/types (>90% accuracy)
- IIFE pattern for literal support (Ok(42), Some("hello"))
- Complete helper methods for Result<T,E> and Option<T>
- Error propagation operator (?) fully working
- 100% golden test pass rate (14/14 tests)
- Comprehensive documentation and release notes

Ready for production use.