feat: Major documentation reorganization and unified Box design updates

## Documentation & Organization
- Moved copilot_issues.txt → 00_MASTER_ROADMAP.md (phases folder)
- Created Phase 9.79b.1 & 9.79b.2 plans for unified Box implementation
- Updated unified-box-design-deep-analysis.md with ChatGPT5 insights
- Added P2P documentation and examples (ping-pong, self-ping)

## Code Updates
- P2PBox: Reverted to original error state for demonstration
- VM: Enhanced BoxCall dispatch for unified approach
- Updated box factory, interpreter calls, and transport layer

## Cleanup & Privacy
- Removed private/ and private_test/ from git tracking
- Added private folders to .gitignore for security
- Cleaned root directory: moved backups, removed temp files
- Moved consultation files to docs/archive/consultations/

## Other Improvements
- Added object literal syntax improvement idea
- Updated CLAUDE.md with master roadmap reference
- Updated CURRENT_TASK.md with latest progress

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

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

src/messaging/message_bus.rs

@@ -114,6 +114,9 @@ impl MessageBusData {
     /// メッセージをルーティング
     pub fn route(&self, to: &str, intent: IntentBox, from: &str) -> Result<(), SendError> {
         if let Some(endpoint) = self.nodes.get(to) {
+            if std::env::var("NYASH_DEBUG_P2P").unwrap_or_default() == "1" {
+                eprintln!("[MessageBus] route {} -> {} intent={}", from, to, intent.get_name().to_string_box().value);
+            }
             endpoint.deliver(intent, from);
             Ok(())
         } else {