- Add complete BoxFactory trait and UnifiedBoxRegistry infrastructure
- Implement BuiltinBoxFactory with 20+ Box types (basic, container, utility, I/O, native/WASM)
- Add PluginBoxFactory integration with v2 plugin system
- Create UserDefinedBoxFactory stub for future InstanceBox integration
- Add global unified registry with priority ordering (builtin > user > plugin)
- Support for all existing Box creation patterns with declarative registration
- Ready for migration from 600+ line match statement to clean Factory pattern
Technical improvements:
- Eliminate 600+ line match statement complexity
- Enable unified Box creation interface: registry.create_box(name, args)
- Support birth/fini lifecycle across all Box types
- Maintain WASM compatibility with conditional compilation
- Thread-safe with Arc<Mutex> pattern
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
