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>

docs/reference/boxes-system/p2p_box.md

@@ -0,0 +1,39 @@
+# P2PBox - Modern P2P Node (InProcess)
+
+Status: Experimental (Phase 9.79a)
+
+## Overview
+- Structured messaging with `IntentBox(name, payload)`
+- Local in-process routing via `MessageBus`
+- Deterministic smoke demo available without timers
+
+## API
+- `new P2PBox(nodeId: String, transport: String)`
+- `send(to: String|Box, intent: IntentBox) -> ResultBox`
+- `on(name: String, handler: MethodRef) -> ResultBox`
+- `onOnce(name: String, handler: MethodRef) -> ResultBox`
+- `off(name: String) -> ResultBox`
+- `getNodeId() -> String`
+- `isReachable(nodeId: String) -> Bool`
+- `getTransportType() -> String`
+- `debugNodes() -> String` (inprocess only)
+- `debugBusId() -> String` (inprocess only)
+- `getLastFrom() -> String` (loopback trace)
+- `getLastIntentName() -> String` (loopback trace)
+
+Notes:
+- Handlers currently accept a method reference (`MethodBox`) rather than an inline function literal.
+- For quick loopback smoke without handlers, send to self and read `getLast*()`.
+
+## Quick Smoke (No Handlers)
+```
+alice = new P2PBox("alice", "inprocess")
+msg = new IntentBox("ping", { })
+res = alice.send("alice", msg)
+print("last.from=" + alice.getLastFrom())
+print("last.intent=" + alice.getLastIntentName())
+```
+
+## Two-Node Ping-Pong (Concept)
+This is covered in unit tests; handler wiring uses `MethodBox` internally. A higher-level sugar for method references will arrive in later phases.
+