- Add plugin_loader_v2.rs with nyash.toml v2 support
- Create PluginBoxV2 as temporary wrapper for v2 plugins
- Update runner.rs to use v2 loader instead of legacy BID registry
- Update box_registry.rs to work with v2 plugin system
- Support single FFI entry point (nyash_plugin_invoke) + optional init
- Integrate with existing BoxFactoryRegistry for seamless Box creation
- All compilation errors resolved, ready for testing
- Rename legacy plugin files to *_legacy.rs for protection
- Comment out old plugin loader and Host VTable dependencies
- Add temporary stub for create_plugin_box during migration
- Fix doc comment placement in io_methods.rs
- Prepare for v2 plugin system with single FFI entry point
