docs(phase 105): Logger Box Framework設計＆ドキュメント整備

- Create logger_box_design.md: comprehensive Logger Box framework design
- Define 3 reference patterns (Lightweight/Structured/Contextual)
- Add pseudo-code examples for each pattern (reference only)
- Update logging_policy.md: add Logger Box reference
- Update hako_logging_design.md: Logger Box integration with Phase 104
- Update ring0-inventory.md: Phase 105 entry
- Update CURRENT_TASK.md: Phase 105 completion + Phase 106+ backlog

Design principles:
- Logger Box provides level-based logging (DEBUG/INFO/WARN/ERROR)
- Phase 105 scope: ConsoleBox output only
- Phase 106 scope: output redirection (FileBox/NetworkBox)
- Reference examples for documentation (execution testing Phase 106+)

This completes the structured logging framework design, building on
Phase 99 (logging policy), Phase 100-101 (Rust logging), Phase 104
(.hako patterns), and Phase 105.5 (console macro unification).

docs/development/current/main/hako_logging_design.md

@@ -324,8 +324,30 @@ box RequestHandler {
 - [ ] テストコード内の println! は許容
 - [ ] 本番環境での不要なログを削除した
 
+## Phase 105: Logger Box Framework Integration
+
+Phase 105 で Logger Box フレームワークが導入され、以下のパターンが正式化されました：
+
+- **LightweightLoggerBox**: メッセージのみの単純ロギング
+- **StructuredLoggerBox**: DEBUG/INFO/WARN/ERROR レベル付きロギング
+- **ContextualLoggerBox**: context（request ID等）付きロギング
+
+詳細な設計と実装例は [Logger Box Design](logger_box_design.md) を参照してください。
+
+### Integration with Phase 104 Categories
+
+Logger Box は以下のカテゴリに対応：
+
+| Phase 104 Category | Logger Box Pattern | Use Case |
+|-------------------|-------------------|----------|
+| user-facing | Direct ConsoleBox (no Logger Box needed) | 単純なユーザーメッセージ |
+| dev-debug | StructuredLogger (DEBUG level) | デバッグ出力 |
+| monitoring | StructuredLogger (INFO level) | 監視情報 |
+| internal Rust | Ring0.log | Rust側の内部ログ |
+
 ## 関連ドキュメント
 
+- [logger_box_design.md](logger_box_design.md) - Phase 105 Logger Box フレームワーク
 - [logging_policy.md](logging_policy.md) - Rust/Ring0.log側方針
 - [ring0-inventory.md](ring0-inventory.md) - println!分類在庫
 - [core_optional_design.md](core_optional_design.md) - Optional化設計