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/box_factory/builtin.rs

@@ -455,8 +455,15 @@ impl BuiltinBoxFactory {
                 });
             }
             let name = args[0].to_string_box().value;
+            // Accept multiple payload forms: JSON string, JSONBox, MapBox
+            let payload_str = if let Some(jb) = args[1].as_any().downcast_ref::<crate::boxes::json::JSONBox>() {
+                jb.to_string()
+            } else if let Some(mb) = args[1].as_any().downcast_ref::<crate::boxes::map_box::MapBox>() {
+                mb.toJSON().to_string_box().value
+            } else {
+                args[1].to_string_box().value
+            };
             // Try parse payload as JSON, fallback to string
-            let payload_str = args[1].to_string_box().value;
             let payload = match serde_json::from_str::<serde_json::Value>(&payload_str) {
                 Ok(json) => json,
                 Err(_) => serde_json::Value::String(payload_str),