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/transport/inprocess.rs

@@ -24,6 +24,17 @@ pub struct InProcessTransport {
     receive_callback: Arc<Mutex<Option<Box<dyn Fn(IntentEnvelope) + Send + Sync>>>>,
 }
 
+impl std::fmt::Debug for InProcessTransport {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("InProcessTransport")
+            .field("node_id", &self.node_id)
+            .field("bus", &"MessageBus")
+            .field("endpoint", &"BusEndpoint")
+            .field("receive_callback", &"<callback>")
+            .finish()
+    }
+}
+
 impl InProcessTransport {
     /// 新しいInProcessTransportを作成
     pub fn new(node_id: String) -> Self {

src/transport/mod.rs

@@ -34,7 +34,7 @@ pub enum TransportError {
 }
 
 /// Abstract transport trait for different communication methods
-pub trait Transport: Send + Sync {
+pub trait Transport: Send + Sync + std::fmt::Debug {
     /// Get the node ID of this transport
     fn node_id(&self) -> &str;