chore: Phase 25.1 完了 - LoopForm v2/Stage1 CLI/環境変数削減 + Phase 26-D からの変更

Phase 25.1 完了成果:
- ✅ LoopForm v2 テスト・ドキュメント・コメント完備
  - 4ケース（A/B/C/D）完全テストカバレッジ
  - 最小再現ケース作成（SSAバグ調査用）
  - SSOT文書作成（loopform_ssot.md）
  - 全ソースに [LoopForm] コメントタグ追加

- ✅ Stage-1 CLI デバッグ環境構築
  - stage1_cli.hako 実装
  - stage1_bridge.rs ブリッジ実装
  - デバッグツール作成（stage1_debug.sh/stage1_minimal.sh）
  - アーキテクチャ改善提案文書

- ✅ 環境変数削減計画策定
  - 25変数の完全調査・分類
  - 6段階削減ロードマップ（25→5、80%削減）
  - 即時削除可能変数特定（NYASH_CONFIG/NYASH_DEBUG）

Phase 26-D からの累積変更:
- PHI実装改善（ExitPhiBuilder/HeaderPhiBuilder等）
- MIRビルダーリファクタリング
- 型伝播・最適化パス改善
- その他約300ファイルの累積変更

🎯 技術的成果:
- SSAバグ根本原因特定（条件分岐内loop変数変更）
- Region+next_iパターン適用完了（UsingCollectorBox等）
- LoopFormパターン文書化・テスト化完了
- セルフホスティング基盤強化

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: ChatGPT <noreply@openai.com>
Co-Authored-By: Task Assistant <task@anthropic.com>

src/boxes/basic/bool_box.rs

@@ -2,7 +2,7 @@
 //!
 //! Implements the core BoolBox type for true/false values.
 
-use crate::box_trait::{NyashBox, BoxCore, BoxBase, StringBox};
+use crate::box_trait::{BoxBase, BoxCore, NyashBox, StringBox};
 use std::any::Any;
 use std::fmt::{Debug, Display};
 
@@ -83,4 +83,4 @@ impl Display for BoolBox {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         self.fmt_box(f)
     }
-}
+}

src/boxes/basic/error_box.rs

@@ -2,7 +2,7 @@
 //!
 //! Implements the ErrorBox type for representing error information.
 
-use crate::box_trait::{NyashBox, BoxCore, BoxBase, StringBox, BoolBox};
+use crate::box_trait::{BoolBox, BoxBase, BoxCore, NyashBox, StringBox};
 use std::any::Any;
 use std::fmt::{Debug, Display};
 
@@ -79,4 +79,4 @@ impl Display for ErrorBox {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         self.fmt_box(f)
     }
-}
+}

src/boxes/basic/file_box.rs

@@ -9,4 +9,4 @@
 )]
 
 // Re-export the new FileBox implementation for backward compatibility
-pub use crate::boxes::file::FileBox;
+pub use crate::boxes::file::FileBox;

src/boxes/basic/integer_box.rs

@@ -2,7 +2,7 @@
 //!
 //! Implements the core IntegerBox type for 64-bit signed integers.
 
-use crate::box_trait::{NyashBox, BoxCore, BoxBase, StringBox, BoolBox};
+use crate::box_trait::{BoolBox, BoxBase, BoxCore, NyashBox, StringBox};
 use std::any::Any;
 use std::fmt::{Debug, Display};
 
@@ -79,4 +79,4 @@ impl Display for IntegerBox {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         self.fmt_box(f)
     }
-}
+}

src/boxes/basic/mod.rs

@@ -4,17 +4,17 @@
 //! fundamental data types in Nyash: String, Integer, Boolean, Void, File, and Error.
 
 // Individual basic box implementations
-mod string_box;
-mod integer_box;
 mod bool_box;
-mod void_box;
-mod file_box;
 mod error_box;
+mod file_box;
+mod integer_box;
+mod string_box;
+mod void_box;
 
 // Re-export all basic box types
-pub use string_box::StringBox;
-pub use integer_box::IntegerBox;
 pub use bool_box::BoolBox;
-pub use void_box::VoidBox;
+pub use error_box::ErrorBox;
 pub use file_box::FileBox;
-pub use error_box::ErrorBox;
+pub use integer_box::IntegerBox;
+pub use string_box::StringBox;
+pub use void_box::VoidBox;

src/boxes/basic/string_box.rs

@@ -2,7 +2,7 @@
 //!
 //! Implements the core StringBox type with all string manipulation methods.
 
-use crate::box_trait::{NyashBox, BoxCore, BoxBase};
+use crate::box_trait::{BoxBase, BoxCore, NyashBox};
 use crate::boxes::ArrayBox;
 use std::any::Any;
 use std::fmt::{Debug, Display};

src/boxes/basic/void_box.rs

@@ -2,7 +2,7 @@
 //!
 //! Implements the core VoidBox type representing empty or null results.
 
-use crate::box_trait::{NyashBox, BoxCore, BoxBase, StringBox, BoolBox};
+use crate::box_trait::{BoolBox, BoxBase, BoxCore, NyashBox, StringBox};
 use std::any::Any;
 use std::fmt::{Debug, Display};
 
@@ -75,4 +75,4 @@ impl Display for VoidBox {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         self.fmt_box(f)
     }
-}
+}