Organize repository structure: clean up root directory

Major reorganization to improve clarity and maintainability:

## Documentation
- Created new simple README.md focused on Layer 1
- Added docs/ARCHITECTURE.md explaining multi-layer design
- Moved LAYER1_REBUILD.md -> docs/LAYER1.md
- Archived old documentation to docs/archive/:
  - CHANGELOG.md, QUICKSTART.md, STATUS.md, USAGE.md
  - DESIGN.md, README_CONFIG.md, ROADMAP.md, TECHNICAL_REVIEW.md
  - claude.md, test-mcp.sh

## Source Code
- Moved unused .rs files to src/tmp/:
  - ai_interpreter.rs (Layer 2 - future)
  - companion.rs (Layer 4b - future)
  - game_formatter.rs (Layer 4a - future)
  - memory.rs (old implementation)
  - extended.rs (old MCP server)

## Result
Clean root directory with only essential files:
- README.md (simple, Layer 1 focused)
- Cargo.toml
- .gitignore
- docs/ (organized documentation)
- src/ (active code only)

All Layer 1 functionality remains intact and tested.

docs/archive/test-mcp.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+
+echo "🧪 MCPサーバーテスト開始..."
+echo ""
+
+# サーバー起動（バックグラウンド）
+./target/debug/aigpt server &
+SERVER_PID=$!
+
+sleep 2
+
+echo "✅ サーバー起動完了 (PID: $SERVER_PID)"
+echo ""
+echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+echo "📋 利用可能なツール一覧:"
+echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+echo ""
+echo "基本ツール:"
+echo "  • create_memory"
+echo "  • search_memories"
+echo "  • update_memory"
+echo "  • delete_memory"
+echo ""
+echo "AI機能ツール 🎮:"
+echo "  • create_memory_with_ai (心理テスト風)"
+echo "  • list_memories_by_priority (ランキング)"
+echo "  • daily_challenge (デイリークエスト)"
+echo ""
+echo "恋愛コンパニオン 💕:"
+echo "  • create_companion"
+echo "  • companion_react"
+echo "  • companion_profile"
+echo ""
+echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+echo ""
+echo "🎯 次のステップ:"
+echo "1. Claude Codeの設定に追加"
+echo "2. Claude Code再起動"
+echo "3. ツールを使って試す！"
+echo ""
+echo "設定ファイル: ~/.config/claude-code/config.json"
+echo ""
+
+# サーバー停止
+kill $SERVER_PID 2>/dev/null
+
+echo "✅ テスト完了！"