feat: Unified registry and major code cleanup by ChatGPT5

- Unified Box Registry: Replaced 600+ line match statement with clean factory pattern
- Code cleanup: Removed unused imports, variables, and dead code
- Import fixes: Fixed RangeBox, NullBox, MapBox imports
- Transport Debug: Added Debug trait implementation for Transport interface
- WASM build: Successfully tested with wasm_playground preset ready for integration
- Performance: Build time stable, WASM package generated successfully (1.89MB)

This commit represents a major architectural improvement with the unified registry
system now fully operational, reducing code duplication and improving maintainability.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/lib.rs

@@ -7,6 +7,8 @@
 // 🌐 WebAssembly support
 #[cfg(target_arch = "wasm32")]
 use wasm_bindgen::prelude::*;
+#[cfg(target_arch = "wasm32")]
+use crate::box_factory::builtin::BuiltinGroups;
 
 pub mod box_trait;
 pub mod boxes;
@@ -109,7 +111,7 @@ impl NyashWasm {
         console_error_panic_hook::set_once();
         
         // Create interpreter with browser-specific setup
-        let interpreter = NyashInterpreter::new();
+        let interpreter = NyashInterpreter::new_with_groups(BuiltinGroups::wasm_playground());
         
         // Register browser-specific boxes
         // ConsoleBox is available as a constructor: console = new ConsoleBox()