feat(phase109): RuntimeProfile設計で FileBox を条件付き optional に

Phase 109 完全実装完了：
- RuntimeProfile enum (Default, NoFs) で profile 制御
- CoreBoxId.is_required_in(profile) で条件付き required/optional
- initialize_runtime() で env 読み込み責務を一元化（修正1）
- NoFsFileIo スタブで no-fs プロファイルでの FileBox 無効化（修正2）
- Logger/ConsoleService は no-fs でも有効と明示（修正2）
- Profile 拡張予定（TestMock/Sandbox/ReadOnly/Embedded）を予約（修正3）

実装ファイル:
- src/runtime/runtime_profile.rs (新規)
- src/providers/ring1/file/nofs_fileio.rs (新規)
- src/runtime/core_box_ids.rs (修正)
- src/runtime/plugin_host.rs (修正)
- src/runtime/provider_lock.rs (修正)
- docs 更新

テスト: Phase 109 11/11 PASS ✅
ビルド: cargo build --release SUCCESS ✅

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

CURRENT_TASK.md

@@ -379,3 +379,52 @@
 
 CURRENT_TASK.md 自体は「いまどこを触っているか」と「次に何をやるか」を  
 1 画面で把握できる軽さを維持する方針だよ。***
+
+---
+
+## Phase 109: RuntimeProfile 機構実装完了 ✅ (2025-12-03)
+
+### 実装内容
+
+**ゴール**: FileBox を profile 依存の conditional required に変更し、minimal/no-fs プロファイルをサポート
+
+**実装完了項目**:
+1. ✅ RuntimeProfile enum + is_required_in() ヘルパー
+   - `src/runtime/runtime_profile.rs`: RuntimeProfile::Default/NoFs 定義
+   - `src/runtime/core_box_ids.rs`: CoreBoxId.is_required_in(profile) 追加
+2. ✅ PluginHost profile-aware 初期化
+   - `src/runtime/plugin_host.rs`: profile 引数追加、FileBox provider チェック実装
+3. ✅ initialize_runtime() に profile 読み込み機構
+   - `src/runtime/mod.rs`: 環境変数読み込み層（責務分離）
+4. ✅ NoFsFileIo stub 実装
+   - `src/providers/ring1/file/nofs_fileio.rs`: FileBox 無効化スタブ
+   - `src/runtime/provider_lock.rs`: init_filebox_provider_for_profile()
+5. ✅ ドキュメント更新
+   - `phase108_filebox_write_semantics.md`: Section 9 追加
+   - `core_boxes_design.md`: Section 5.4 追加
+
+**テスト結果**:
+- ✅ test_core_box_id_is_required_in_default
+- ✅ test_core_box_id_is_required_in_nofs
+- ✅ test_with_core_from_registry_nofs_filebox_optional
+- ✅ test_nofs_fileio_caps/open/read/write/close_unsupported (5 tests)
+- ✅ cargo build --release: 成功
+- ✅ cargo test --release --lib: Phase 109 tests 全 PASS
+
+**設計原則**:
+- **責務分離**: initialize_runtime() のみが env を読む、PluginHost は profile を受け取る
+- **Fail-Fast 維持**: Default profile では FileBox provider 必須
+- **Logger/ConsoleService 有効**: NoFs でも Ring0.log と ConsoleBox は動作
+- **互換性保証**: Default profile で Phase 107/108 の動作を完全維持
+
+**将来拡張予定**:
+- TestMock: テスト用プロファイル
+- Sandbox: サンドボックスプロファイル
+- ReadOnly: 読み取り専用プロファイル
+- Embedded: 組み込みプロファイル
+
+**次のタスク候補**:
+- Phase 110: FileHandleBox（複数ファイル同時アクセス）
+- Phase 111: append mode 追加
+- Phase 112: Ring0 service registry 統一化
+

docs/development/current/main/core_boxes_design.md

@@ -292,7 +292,122 @@ FileBox の実体 I/O は、以下の層構造で Ring0.FsApi を通す設計が
 - `src/runtime/provider_lock.rs`: init_default_filebox_provider() ヘルパー
 - `src/runtime/plugin_host.rs`: 起動時自動登録
 
-### 5.4 今後の拡張
+### 5.4 Phase 109 - RuntimeProfile 機構（2025-12-03 完了）✅
+
+**ゴール**:
+- FileBox を **profile 依存の conditional required** に変更
+- Default profile（selfhost/standard）では FileBox 必須を維持
+- NoFs profile（minimal runtime）では FileBox を optional に
+
+**実装内容**:
+
+1. **RuntimeProfile enum 導入** (`src/runtime/runtime_profile.rs`):
+   ```rust
+   pub enum RuntimeProfile {
+       Default,  // selfhost/standard
+       NoFs,     // minimal runtime without filesystem
+   }
+
+   impl RuntimeProfile {
+       pub fn from_env() -> Self {
+           // NYASH_RUNTIME_PROFILE=no-fs → NoFs
+           // それ以外 → Default
+       }
+   }
+   ```
+
+2. **CoreBoxId に profile-aware 判定追加** (`src/runtime/core_box_ids.rs`):
+   ```rust
+   pub fn is_required_in(&self, profile: &RuntimeProfile) -> bool {
+       match profile {
+           RuntimeProfile::Default => {
+               // FileBox は required（Phase 106 互換）
+               self.is_core_required()
+           }
+           RuntimeProfile::NoFs => {
+               // FileBox は optional
+               matches!(self, String | Integer | Bool | Array | Map | Console)
+           }
+       }
+   }
+   ```
+
+3. **PluginHost に profile 引数追加** (`src/runtime/plugin_host.rs`):
+   - `with_core_from_registry_optional(ring0, registry, config, profile)` に拡張
+   - profile-aware FileBox provider チェック：
+     - Default: provider 必須（CoreInitError::MissingService if None）
+     - NoFs: provider なくても OK（黙って skip）
+
+4. **NoFsFileIo stub 実装** (`src/providers/ring1/file/nofs_fileio.rs`):
+   ```rust
+   pub struct NoFsFileIo;
+
+   impl FileIo for NoFsFileIo {
+       fn caps(&self) -> FileCaps { FileCaps { read: false, write: false } }
+       fn open/read/write/close → Err(FileError::Unsupported)
+   }
+   ```
+
+5. **initialize_runtime() に profile 読み込み追加** (`src/runtime/mod.rs`):
+   - 環境変数から profile を読む（**この層のみで実施**）
+   - NoFs profile の場合、NoFsFileIo を登録
+   - PluginHost に profile を渡す（**env に依存しない**）
+
+**設計原則（Modification 1: 責務分離）**:
+```
+【Layer】          【責務】                    【Example】
+────────────────────────────────────────────────────────
+env               User configuration         NYASH_RUNTIME_PROFILE=no-fs
+initialize_runtime() env → RuntimeProfile   profile = RuntimeProfile::from_env()
+PluginHost        profile-aware checks      is_required_in(&profile)
+CoreBoxId         条件付き required 判定    is_required_in(&profile)
+provider_lock     provider 登録（Profile 後）set_filebox_provider()
+FileBox           provider 経由             read/write 実装
+```
+
+**Logger/ConsoleService の有効性（Modification 2）**:
+- ✅ **NoFs profile でも有効**:
+  - Ring0.log（OS抽象化層 - panic/exit 時の最終出力）
+  - ConsoleBox（言語レベル console - stdout/stderr）
+  - その他 core_required（String/Integer/Bool/Array/Map/Console）
+- ❌ **NoFs profile で無効**:
+  - FileBox（ファイルシステム依存）
+  - Regex/Time/JSON 等のオプショナル boxes（将来：profile ごとに制御可能）
+
+**将来の拡張予定（Modification 3）**:
+- **TestMock**: テスト用（すべてのプラグインが mock に）
+- **Sandbox**: サンドボックス（外部 I/O 禁止）
+- **ReadOnly**: 読み取り専用（FileBox.write 禁止）
+- **Embedded**: 組み込み（メモリ制限あり、GC あり）
+
+**実装箇所**:
+- `src/runtime/runtime_profile.rs`: RuntimeProfile enum 定義
+- `src/runtime/core_box_ids.rs`: is_required_in() メソッド
+- `src/runtime/plugin_host.rs`: profile-aware 初期化ロジック
+- `src/runtime/provider_lock.rs`: init_filebox_provider_for_profile()
+- `src/providers/ring1/file/nofs_fileio.rs`: NoFs stub 実装
+- `src/runtime/mod.rs`: initialize_runtime() に profile 読み込み
+
+**テスト**:
+- ✅ test_core_box_id_is_required_in_default
+- ✅ test_core_box_id_is_required_in_nofs
+- ✅ test_with_core_from_registry_nofs_filebox_optional
+- ✅ test_nofs_fileio_caps/open/read/write/close_unsupported
+
+**互換性**:
+- Phase 107/108 の既存動作は Default profile で完全維持
+- NoFs profile は完全に新規追加（既存コードに影響なし）
+
+### 5.5 今後の拡張（Phase 110+）
+
+Phase 110 以降では、FileBox/FS 周りの扱いをプロファイルと Box 設計の両面から広げていく予定：
+- **Phase 110: FileHandleBox**
+  - FileBox は「1 ファイル専用 API」としてシンプルに保ち、複数ファイル同時アクセスは FileHandleBox 側に切り出す設計。
+  - Ring0FsFileIo を内部で再利用しつつ、ハンドル単位で FsApi をラップする。
+- **Phase 111: metadata API 整理**
+  - `FsApi::metadata/exists/canonicalize` を FileIo / FileBox 側に橋渡しし、Nyash 側から stat 情報を扱えるようにする。
+
+これらはすべて `CoreBoxId` / Ring0.FsApi / FileIo / FileBox の既存ラインの上に小さく積む形で設計する。
 
 新しいメソッド追加は `src/runtime/core_box_ids.rs` の編集のみで完結：
 1. CoreMethodId enum にバリアント追加

docs/development/current/main/phase107_fsapi_fileio_bridge.md

@@ -351,12 +351,12 @@ provider_lock          登録・参照                   OnceLock管理
 FileBox                ユーザーAPI                  provider 経由のみ
 ```
 
-### 拡張ポイント
+### 拡張ポイント（Phase 109+）
 
-**将来の実装**:
-- MockFileIo: FsApi の代わりに in-memory mock を使う
-- NetworkFileIo: FsApi の代わりに remote FS を使う
-- minimal/no-fs: provider 登録をスキップ（FileBox optional化）
+**将来の実装候補**:
+- MockFileIo: FsApi の代わりに in-memory mock を使う（テスト専用）
+- NetworkFileIo: FsApi の代わりに remote FS を使う（将来の分散 FS / リモートログ用途）
+- minimal/no-fs: RuntimeProfile に応じて provider 登録をスキップし、FileBox を read-only / disabled として扱う
 
 ---
 

docs/development/current/main/phase108_filebox_write_semantics.md

@@ -322,4 +322,41 @@ fn test_filebox_double_open() {
 
 ---
 
+## 9. Phase 109 以降の計画
+
+### Phase 109: RuntimeProfile 機構の追加
+
+**Phase 109 完了により、FileBox は conditional required に変更されました**：
+
+- **RuntimeProfile enum 導入**（Default/NoFs）
+- **Default profile**: FileBox は required（Phase 107/108 の動作を維持）
+- **NoFs profile**: FileBox は optional（NoFsFileIo stub で無効化）
+
+**設計変更**:
+```rust
+// Phase 109 以前: FileBox は常に required
+CoreBoxId::File.is_core_required() // → true
+
+// Phase 109 以降: profile 依存の判定に
+CoreBoxId::File.is_required_in(&RuntimeProfile::Default) // → true
+CoreBoxId::File.is_required_in(&RuntimeProfile::NoFs)    // → false
+```
+
+**プロファイル別動作**:
+- **Default**: Ring0FsFileIo（read/write 両対応）自動登録
+- **NoFs**: NoFsFileIo（全操作で Unsupported エラー）登録
+
+**将来の拡張計画**（Phase 109 Modification 3）:
+- TestMock: テスト用（全プラグインが mock に）
+- Sandbox: サンドボックス（外部 I/O 禁止）
+- ReadOnly: 読み取り専用（FileBox.write 禁止）
+- Embedded: 組み込み（メモリ制限・GC あり）
+
+**互換性**:
+- Phase 107/108 の既存動作は Default profile で完全維持
+- NoFs profile は完全に新規追加（既存コードに影響なし）
+
+---
+
 **Phase 108 指示書作成日**: 2025-12-03（微調整版）
+**Phase 109 追記**: 2025-12-03（RuntimeProfile 統合完了）

docs/development/current/main/ring0-inventory.md

@@ -557,13 +557,37 @@ rg 'impl.*LogApi' --type rust
 
 ## Summary
 
-Phase 99 establishes a **clear inventory** of logging infrastructure and println! call sites:
+Phase 85–108 で、Ring0 / CoreServices / FileBox / Logging の基礎はほぼ出揃った：
 
-1. **Ring0.log**: Underutilized, ready for expansion
-2. **println!/eprintln!**: 1477 production call sites categorized into 4 groups
-3. **Migration strategy**: Phased approach starting with user-facing messages
-4. **Success criteria**: Clear metrics for each phase
+- Ring0Context: Mem/Io/Time/Log/Fs/Thread の抽象化が確立
+- CoreBoxId/CoreMethodId: Box 名・メソッド名の SSOT 化
+- CoreServices/PluginHost: ring1-core (String/Integer/Bool/Array/Map/Console) の service 化
+- ConsoleService/Logging: 3層設計（Ring0.log / ConsoleService / test println!）が定着
+- FileBox: CoreRequired 扱い + Ring0FsFileIo 経由で read/write 両対応
 
-**Phase 102**: StdMem implementation complete, preparing for hakmem integration.
+Phase 99 は logging infrastructure と println! call site の在庫を整理し：
 
-**Next Steps**: Phase 100+ will implement gradual migrations based on this inventory.
+1. **Ring0.log**: dev/debug ログの受け皿として拡張準備済み
+2. **println!/eprintln!**: ~1400 箇所を 4 カテゴリに分類（user-facing/dev/test/internal）
+3. **Migration strategy**: user-facing → Ring0.log/internal の順で段階的移行
+
+Phase 102 では StdMem 実装により hakmem 統合の足場を用意し、  
+Phase 106–108 では FileBox provider_lock / Ring0FsFileIo / write/write_all 実装により、
+`FileBox → FileIo → Ring0.FsApi → std::fs` のパイプラインが完成した。
+
+### Next Phases（計画）
+
+今後の候補フェーズ（優先度の高い順）:
+
+- **Phase 109: runtime profiles（default/no-fs）**
+  - `NYASH_PROFILE={default|no-fs}` などのプロファイル導入
+  - default では FileBox 必須、no-fs では FileBox provider 未登録（エラー文字列で通知）
+- **Phase 110: FileHandleBox**
+  - FileBox を「1ファイル専用」に保ちつつ、複数ファイル同時アクセスは FileHandleBox 側に切り出す
+  - Ring0FsFileIo を再利用してハンドル単位の管理を行う
+- **Phase 111: Fs metadata 拡張**
+  - `exists/metadata/canonicalize` を FileIo / FileBox 側にきちんとエクスポート
+  - Ring0.FsApi の stat 情報を Nyash 側から扱えるようにする
+
+さらに長期的には、Ring0 全体を「統一サービスレジストリ」として扱うフェーズ（Mem/Io/Time/Log/Fs/Thread の trait 統合）を  
+Phase 11x 以降で検討する予定だよ。

src/providers/ring1/file/mod.rs

@@ -1,2 +1,3 @@
 pub mod core_ro;
 pub mod ring0_fs_fileio;
+pub mod nofs_fileio; // Phase 109: NoFs profile stub

src/providers/ring1/file/nofs_fileio.rs

@@ -0,0 +1,98 @@
+//! Phase 109: NoFs profile FileIo stub
+//!
+//! Provides a stub FileIo implementation that returns errors for all operations.
+//! Used when FileBox is disabled in no-fs runtime profile.
+
+use crate::boxes::file::provider::{FileCaps, FileError, FileIo, FileResult};
+
+/// Phase 109: No-filesystem FileIo stub
+///
+/// Returns Unsupported errors for all operations.
+/// Used in NoFs runtime profile where FileBox is disabled.
+///
+/// # Design
+///
+/// - caps(): Returns read=false, write=false
+/// - All operations: Return FileError::Unsupported with clear message
+///
+/// # Logger/ConsoleService availability (Phase 109 Modification 2)
+///
+/// ✅ Still available in NoFs profile:
+/// - Ring0.log (OS abstraction layer - panic/exit final output)
+/// - ConsoleBox (language-level console - stdout/stderr)
+/// - Core required boxes (String/Integer/Bool/Array/Map/Console)
+///
+/// ❌ Disabled in NoFs profile:
+/// - FileBox (filesystem-dependent)
+/// - Optional boxes (Regex/Time/JSON - future: profile-controlled)
+pub struct NoFsFileIo;
+
+impl FileIo for NoFsFileIo {
+    fn caps(&self) -> FileCaps {
+        FileCaps {
+            read: false,
+            write: false,
+        }
+    }
+
+    fn open(&self, _path: &str) -> FileResult<()> {
+        Err(FileError::Unsupported)
+    }
+
+    fn read(&self) -> FileResult<String> {
+        Err(FileError::Unsupported)
+    }
+
+    fn write(&self, _text: &str) -> FileResult<()> {
+        Err(FileError::Unsupported)
+    }
+
+    fn close(&self) -> FileResult<()> {
+        Err(FileError::Unsupported)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_nofs_fileio_caps() {
+        let fileio = NoFsFileIo;
+        let caps = fileio.caps();
+        assert!(!caps.read, "NoFsFileIo should report read=false");
+        assert!(!caps.write, "NoFsFileIo should report write=false");
+    }
+
+    #[test]
+    fn test_nofs_fileio_open_unsupported() {
+        let fileio = NoFsFileIo;
+        let result = fileio.open("/tmp/test.txt");
+        assert!(result.is_err());
+        assert!(result.unwrap_err().to_string().contains("unsupported"));
+    }
+
+    #[test]
+    fn test_nofs_fileio_read_unsupported() {
+        let fileio = NoFsFileIo;
+        let result = fileio.read();
+        assert!(result.is_err());
+        assert!(result.unwrap_err().to_string().contains("unsupported"));
+    }
+
+    #[test]
+    fn test_nofs_fileio_write_unsupported() {
+        let fileio = NoFsFileIo;
+        let result = fileio.write("test");
+        assert!(result.is_err());
+        assert!(result.unwrap_err().to_string().contains("unsupported"));
+    }
+
+    #[test]
+    fn test_nofs_fileio_close_unsupported() {
+        let fileio = NoFsFileIo;
+        let result = fileio.close();
+        assert!(result.is_err());
+        assert!(result.unwrap_err().to_string().contains("unsupported"));
+    }
+}

src/runtime/core_box_ids.rs

@@ -3,6 +3,8 @@
 //! Nyash の core Box を型安全な enum で管理する。
 //! ハードコード文字列からの脱却により、コンパイル時検証を実現。
 
+use crate::runtime::runtime_profile::RuntimeProfile;
+
 /// Phase 85 調査結果に基づく Core Box ID
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub enum CoreBoxId {
@@ -118,6 +120,30 @@ impl CoreBoxId {
         matches!(self, String | Integer | Bool | Array | Map | Console | File)
     }
 
+    /// Phase 109: profile-aware required check
+    ///
+    /// Determines if this CoreBox is required in the given RuntimeProfile.
+    ///
+    /// - Default: Same as is_core_required() (FileBox is required)
+    /// - NoFs: FileBox becomes optional (only String/Integer/Bool/Array/Map/Console required)
+    ///
+    /// **Future expansion**: TestMock/Sandbox/ReadOnly/Embedded profiles will extend this logic
+    pub fn is_required_in(&self, profile: &RuntimeProfile) -> bool {
+        use CoreBoxId::*;
+        let core_required = matches!(self, String | Integer | Bool | Array | Map | Console);
+
+        match profile {
+            RuntimeProfile::Default => {
+                // Phase 106: FileBox is required in Default profile
+                self.is_core_required()
+            }
+            RuntimeProfile::NoFs => {
+                // Phase 109: FileBox is optional in NoFs profile
+                core_required
+            }
+        }
+    }
+
     /// Phase 87: カテゴリ分類
     pub fn category(&self) -> CoreBoxCategory {
         use CoreBoxId::*;
@@ -372,6 +398,32 @@ mod tests {
         assert_eq!(CoreBoxId::Function.category(), CoreBoxCategory::Special);
     }
 
+    #[test]
+    fn test_core_box_id_is_required_in_default() {
+        use crate::runtime::runtime_profile::RuntimeProfile;
+        let profile = RuntimeProfile::Default;
+        assert!(CoreBoxId::String.is_required_in(&profile));
+        assert!(CoreBoxId::Integer.is_required_in(&profile));
+        assert!(CoreBoxId::Bool.is_required_in(&profile));
+        assert!(CoreBoxId::Array.is_required_in(&profile));
+        assert!(CoreBoxId::Map.is_required_in(&profile));
+        assert!(CoreBoxId::Console.is_required_in(&profile));
+        assert!(CoreBoxId::File.is_required_in(&profile)); // FileBox required in Default
+    }
+
+    #[test]
+    fn test_core_box_id_is_required_in_nofs() {
+        use crate::runtime::runtime_profile::RuntimeProfile;
+        let profile = RuntimeProfile::NoFs;
+        assert!(CoreBoxId::String.is_required_in(&profile));
+        assert!(CoreBoxId::Integer.is_required_in(&profile));
+        assert!(CoreBoxId::Bool.is_required_in(&profile));
+        assert!(CoreBoxId::Array.is_required_in(&profile));
+        assert!(CoreBoxId::Map.is_required_in(&profile));
+        assert!(CoreBoxId::Console.is_required_in(&profile));
+        assert!(!CoreBoxId::File.is_required_in(&profile)); // FileBox optional in NoFs
+    }
+
     // ===== CoreMethodId tests =====
 
     #[test]

src/runtime/mod.rs

@@ -9,6 +9,7 @@ pub mod deprecations;
 pub mod gc;
 pub mod plugin_host; // Phase 91: PluginHost skeleton
 pub mod ring0; // Phase 88: Ring0Context - OS API 抽象化レイヤー
+pub mod runtime_profile; // Phase 109: RuntimeProfile enum (Default/NoFs)
 pub mod gc_controller;
 pub mod gc_mode;
 pub mod gc_trace;
@@ -42,6 +43,7 @@ pub use box_registry::{get_global_registry, BoxFactoryRegistry, BoxProvider};
 pub use core_box_ids::{CoreBoxCategory, CoreBoxId, CoreMethodId}; // Phase 87: 型安全enum
 pub use plugin_config::PluginConfig;
 pub use ring0::{get_global_ring0, init_global_ring0, Ring0Context}; // Phase 88: Ring0 公開 API
+pub use runtime_profile::RuntimeProfile; // Phase 109: RuntimeProfile enum
 pub use plugin_host::CoreInitError; // Phase 92: CoreServices 初期化エラー
 pub use plugin_loader_unified::{
     get_global_plugin_host, init_global_plugin_host, MethodHandle, PluginBoxType, PluginHost,
@@ -98,21 +100,55 @@ macro_rules! console_println {
     };
 }
 
-/// Runtime 初期化（Phase 95: global accessor 実装完了）
+/// Runtime 初期化（Phase 95/109: profile-aware initialization）
 ///
 /// Phase 94: フォールバック削除 - 常に実際の Box を使用
 /// Phase 95: global に登録して get_core_plugin_host() でアクセス可能に
+/// Phase 109: RuntimeProfile に基づく条件付き初期化
+///
+/// # Responsibility Separation (Phase 109 Modification 1)
+///
+/// - **initialize_runtime**: 環境変数から profile を読む（唯一の env reader）
+/// - **PluginHost**: profile を引数として受け取る（env に依存しない）
+///
+/// # Profile behavior
+///
+/// - **Default**: FileBox provider 必須（Fail-Fast）、全 core services 有効
+/// - **NoFs**: FileBox provider optional（disabled stub）、core services のみ有効
 pub fn initialize_runtime(ring0: std::sync::Arc<Ring0Context>) -> Result<(), CoreInitError> {
     use crate::box_factory::UnifiedBoxRegistry;
     use crate::box_factory::builtin::BuiltinBoxFactory;
 
+    // Phase 109: Read RuntimeProfile from environment (this layer only)
+    let profile = RuntimeProfile::from_env();
+
     let mut registry = UnifiedBoxRegistry::with_env_policy();
 
     // Phase 94: BuiltinBoxFactory を登録して core_required Boxes を提供
     registry.register(std::sync::Arc::new(BuiltinBoxFactory::new()));
 
-    // Phase 94: 常に実際の Box → Service 変換を使用（Fail-Fast原則）
-    let plugin_host = plugin_host::PluginHost::with_core_from_registry(ring0, &registry)?;
+    // Phase 109: Profile-aware FileBox provider initialization
+    // Note: This is done BEFORE PluginHost initialization to allow plugin override
+    match profile {
+        RuntimeProfile::Default => {
+            // Default profile: FileBox provider will be auto-registered in PluginHost
+            // (no action needed here, kept for documentation)
+        }
+        RuntimeProfile::NoFs => {
+            // NoFs profile: Register NoFsFileIo stub
+            use crate::runtime::provider_lock;
+            let _ = provider_lock::init_filebox_provider_for_profile(&ring0, &profile);
+            // Ignore error - PluginHost will handle missing provider gracefully
+        }
+    }
+
+    // Phase 109: Pass profile to PluginHost (env-independent)
+    let plugin_host = plugin_host::PluginHost::with_core_from_registry_optional(
+        ring0,
+        &registry,
+        plugin_host::CoreServicesConfig::all_enabled(),
+        &profile,
+    )?;
     plugin_host.ensure_core_initialized();
 
     // Phase 95: global に登録

src/runtime/plugin_host.rs

@@ -8,6 +8,7 @@ use std::collections::HashMap;
 use std::any::Any;
 use crate::box_factory::UnifiedBoxRegistry;
 use crate::runtime::CoreBoxId;
+use crate::runtime::RuntimeProfile;
 
 /// Phase 103: CoreServices Optional化設定
 ///
@@ -98,7 +99,8 @@ use super::ring0::Ring0Context;
 pub enum CoreInitError {
     MissingService {
         box_id: CoreBoxId,
-        message: String,
+        /// Phase 109: hint now includes profile context
+        hint: String,
     },
     RegistryEmpty,
     InvalidServiceType {
@@ -111,8 +113,8 @@ pub enum CoreInitError {
 impl std::fmt::Display for CoreInitError {
     fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
         match self {
-            CoreInitError::MissingService { box_id, message } => {
-                write!(f, "Missing core service {:?}: {}", box_id, message)
+            CoreInitError::MissingService { box_id, hint } => {
+                write!(f, "Missing core service {:?}: {}", box_id, hint)
             }
             CoreInitError::RegistryEmpty => {
                 write!(f, "UnifiedBoxRegistry is empty")
@@ -143,43 +145,73 @@ impl PluginHost {
         unimplemented!("Phase 92 で from_registry() 実装後に削除")
     }
 
-    /// Phase 103: Optional CoreServices initialization
+    /// Phase 103/109: Optional CoreServices initialization with RuntimeProfile support
     ///
-    /// Allows selective initialization based on CoreServicesConfig.
+    /// Allows selective initialization based on CoreServicesConfig and RuntimeProfile.
     /// ConsoleBox is mandatory for user-facing output.
+    ///
+    /// Phase 109 additions:
+    /// - `profile` parameter controls FileBox provider requirements
+    /// - Default profile: FileBox provider is required (Fail-Fast)
+    /// - NoFs profile: FileBox provider is optional (disabled)
     pub fn with_core_from_registry_optional(
         ring0: Arc<Ring0Context>,
         registry: &UnifiedBoxRegistry,
         config: CoreServicesConfig,
+        profile: &RuntimeProfile,
     ) -> Result<Self, CoreInitError> {
         use crate::runtime::core_services::*;
         use crate::runtime::provider_lock;
 
-        // Phase 107: Auto-register default FileBox provider (Ring0.FsApi-based)
-        // This happens before the Phase 106 check, so plugins can still override.
-        // If a plugin has already registered, this returns Err but we continue.
-        if CoreBoxId::File.is_core_required() {
-            match provider_lock::init_default_filebox_provider(&ring0) {
-                Ok(()) => {
-                    // Default provider registered successfully
-                    ring0.log.debug("[Phase 107] Ring0FsFileIo registered as default FileBox provider");
-                }
-                Err(msg) => {
-                    // Plugin provider already registered - this is OK (plugin priority)
-                    ring0.log.debug(&format!("[Phase 107] {}", msg));
-                }
+        // Phase 109: Profile-aware required check
+        for box_id in CoreBoxId::iter() {
+            if box_id.is_required_in(profile) && !registry.has_type(box_id.name()) {
+                return Err(CoreInitError::MissingService {
+                    box_id,
+                    hint: format!(
+                        "Core Box {} is required in {} profile but not found in registry",
+                        box_id.name(),
+                        profile.name()
+                    ),
+                });
             }
         }
 
-        // Phase 106: FileBox provider チェック追加
-        // CoreBoxId がFileを必須と判定している場合、provider が登録されていることを確認
-        // Phase 107: With auto-registration above, this check should always pass
-        if CoreBoxId::File.is_core_required() {
-            if provider_lock::get_filebox_provider().is_none() {
-                return Err(CoreInitError::MissingService {
-                    box_id: CoreBoxId::File,
-                    message: "FileBox provider not registered (required for selfhost/default profile)".to_string(),
-                });
+        // Phase 109: Profile-aware FileBox provider check
+        match profile {
+            RuntimeProfile::Default => {
+                // Phase 107: Auto-register default FileBox provider (Ring0.FsApi-based)
+                // This happens before the Phase 106 check, so plugins can still override.
+                // If a plugin has already registered, this returns Err but we continue.
+                if CoreBoxId::File.is_required_in(profile) {
+                    match provider_lock::init_default_filebox_provider(&ring0) {
+                        Ok(()) => {
+                            // Default provider registered successfully
+                            ring0.log.debug("[Phase 107] Ring0FsFileIo registered as default FileBox provider");
+                        }
+                        Err(msg) => {
+                            // Plugin provider already registered - this is OK (plugin priority)
+                            ring0.log.debug(&format!("[Phase 107] {}", msg));
+                        }
+                    }
+                }
+
+                // Phase 106/109: FileBox provider チェック (Default profile)
+                // CoreBoxId がFileを必須と判定している場合、provider が登録されていることを確認
+                // Phase 107: With auto-registration above, this check should always pass
+                if CoreBoxId::File.is_required_in(profile) {
+                    if provider_lock::get_filebox_provider().is_none() {
+                        return Err(CoreInitError::MissingService {
+                            box_id: CoreBoxId::File,
+                            hint: "FileBox provider not registered (required for Default profile)".to_string(),
+                        });
+                    }
+                }
+            }
+            RuntimeProfile::NoFs => {
+                // Phase 109: FileBox provider is optional in NoFs profile
+                // We skip provider initialization and checks entirely
+                ring0.log.debug("[Phase 109] NoFs profile: FileBox provider skipped");
             }
         }
 
@@ -197,7 +229,7 @@ impl PluginHost {
             if !registry.has_type("StringBox") {
                 return Err(CoreInitError::MissingService {
                     box_id: CoreBoxId::String,
-                    message: "StringBox enabled but not found in registry".to_string(),
+                    hint: "StringBox enabled but not found in registry".to_string(),
                 });
             }
             core.string = Some(Arc::new(StringBoxAdapter::new()));
@@ -208,7 +240,7 @@ impl PluginHost {
             if !registry.has_type("IntegerBox") {
                 return Err(CoreInitError::MissingService {
                     box_id: CoreBoxId::Integer,
-                    message: "IntegerBox enabled but not found in registry".to_string(),
+                    hint: "IntegerBox enabled but not found in registry".to_string(),
                 });
             }
             core.integer = Some(Arc::new(IntegerBoxAdapter::new()));
@@ -219,7 +251,7 @@ impl PluginHost {
             if !registry.has_type("BoolBox") {
                 return Err(CoreInitError::MissingService {
                     box_id: CoreBoxId::Bool,
-                    message: "BoolBox enabled but not found in registry".to_string(),
+                    hint: "BoolBox enabled but not found in registry".to_string(),
                 });
             }
             core.bool = Some(Arc::new(BoolBoxAdapter::new()));
@@ -230,7 +262,7 @@ impl PluginHost {
             if !registry.has_type("ArrayBox") {
                 return Err(CoreInitError::MissingService {
                     box_id: CoreBoxId::Array,
-                    message: "ArrayBox enabled but not found in registry".to_string(),
+                    hint: "ArrayBox enabled but not found in registry".to_string(),
                 });
             }
             core.array = Some(Arc::new(ArrayBoxAdapter::new()));
@@ -241,7 +273,7 @@ impl PluginHost {
             if !registry.has_type("MapBox") {
                 return Err(CoreInitError::MissingService {
                     box_id: CoreBoxId::Map,
-                    message: "MapBox enabled but not found in registry".to_string(),
+                    hint: "MapBox enabled but not found in registry".to_string(),
                 });
             }
             core.map = Some(Arc::new(MapBoxAdapter::new()));
@@ -252,14 +284,14 @@ impl PluginHost {
             if !registry.has_type("ConsoleBox") {
                 return Err(CoreInitError::MissingService {
                     box_id: CoreBoxId::Console,
-                    message: "ConsoleBox is mandatory but not found in registry".to_string(),
+                    hint: "ConsoleBox is mandatory but not found in registry".to_string(),
                 });
             }
             core.console = Some(Arc::new(ConsoleBoxAdapter::new()));
         } else {
             return Err(CoreInitError::MissingService {
                 box_id: CoreBoxId::Console,
-                message: "Phase 103: ConsoleBox is mandatory for user-facing output".to_string(),
+                hint: "Phase 103: ConsoleBox is mandatory for user-facing output".to_string(),
             });
         }
 
@@ -270,19 +302,22 @@ impl PluginHost {
         })
     }
 
-    /// Phase 101: Backward compatibility - all services required
+    /// Phase 101/109: Backward compatibility - all services required with Default profile
     ///
     /// Maintains existing behavior: all CoreServices must be present.
     /// Used by default_ring0 and other initialization paths expecting all services.
+    ///
+    /// Phase 109: Now uses Default profile (FileBox required)
     pub fn with_core_from_registry(
         ring0: Arc<Ring0Context>,
         registry: &UnifiedBoxRegistry,
     ) -> Result<Self, CoreInitError> {
-        // Use all_enabled() for backward compatibility
+        // Use all_enabled() and Default profile for backward compatibility
         Self::with_core_from_registry_optional(
             ring0,
             registry,
             CoreServicesConfig::all_enabled(),
+            &RuntimeProfile::Default,
         )
     }
 
@@ -389,7 +424,7 @@ mod tests {
     fn test_core_init_error_display() {
         let error = CoreInitError::MissingService {
             box_id: CoreBoxId::String,
-            message: "StringBox not found".to_string(),
+            hint: "StringBox not found".to_string(),
         };
         let display = format!("{}", error);
         assert!(display.contains("String"));
@@ -450,6 +485,29 @@ mod tests {
             panic!("FileBox provider should be registered after with_core_from_registry");
         }
     }
+
+    #[test]
+    fn test_with_core_from_registry_nofs_filebox_optional() {
+        // Phase 109: NoFs profile では FileBox provider なしで OK
+        use crate::runtime::ring0::default_ring0;
+        use crate::box_factory::builtin::BuiltinBoxFactory;
+
+        let ring0 = Arc::new(default_ring0());
+        let mut registry = UnifiedBoxRegistry::new();
+        registry.register(Arc::new(BuiltinBoxFactory::new()));
+
+        // Phase 109: NoFs profile で初期化
+        let profile = RuntimeProfile::NoFs;
+        let result = PluginHost::with_core_from_registry_optional(
+            ring0,
+            &registry,
+            CoreServicesConfig::all_enabled(),
+            &profile,
+        );
+
+        // Phase 109: FileBox は optional なので、provider なしで成功するはず
+        assert!(result.is_ok(), "Expected success with NoFs profile (FileBox optional)");
+    }
 }
 
 #[cfg(test)]

src/runtime/provider_lock.rs

@@ -92,3 +92,40 @@ pub fn init_default_filebox_provider(
     set_filebox_provider(provider)
         .map_err(|_| "Plugin FileBox provider already registered".to_string())
 }
+
+/// Phase 109: Initialize FileBox provider based on RuntimeProfile
+///
+/// This helper registers the appropriate FileBox provider for the given profile:
+/// - Default: Ring0FsFileIo (Ring0.FsApi-based, read/write support)
+/// - NoFs: NoFsFileIo (stub that returns Unsupported errors)
+///
+/// # Returns
+///
+/// - `Ok(())`: Provider registered successfully
+/// - `Err(msg)`: Provider already registered (plugin took precedence)
+///
+/// # Design (Phase 109)
+///
+/// This function is called during initialize_runtime() and respects the profile:
+/// - Default profile: Registers Ring0FsFileIo for full filesystem access
+/// - NoFs profile: Registers NoFsFileIo stub (all operations return Unsupported)
+pub fn init_filebox_provider_for_profile(
+    ring0: &Arc<crate::runtime::ring0::Ring0Context>,
+    profile: &crate::runtime::RuntimeProfile,
+) -> Result<(), String> {
+    use crate::runtime::RuntimeProfile;
+
+    match profile {
+        RuntimeProfile::Default => {
+            // Phase 107: Standard profile uses Ring0FsFileIo
+            init_default_filebox_provider(ring0)
+        }
+        RuntimeProfile::NoFs => {
+            // Phase 109: NoFs profile uses NoFsFileIo stub
+            use crate::providers::ring1::file::nofs_fileio::NoFsFileIo;
+            let provider = Arc::new(NoFsFileIo);
+            set_filebox_provider(provider)
+                .map_err(|_| "FileBox provider already set (unexpected in NoFs profile)".to_string())
+        }
+    }
+}

src/runtime/runtime_profile.rs

@@ -0,0 +1,74 @@
+//! Phase 109: RuntimeProfile enum
+//!
+//! Controls conditional core service initialization based on runtime profile.
+//! Supports Default (selfhost/standard) and NoFs (minimal runtime without filesystem).
+
+/// Phase 109: RuntimeProfile
+///
+/// Controls availability of FileBox and other optional services.
+///
+/// - Default: selfhost/standard - most services enabled (FileBox required)
+/// - NoFs: minimal runtime - FileBox disabled, core boxes only
+///
+/// Future expansion planned: TestMock, Sandbox, ReadOnly, Embedded
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum RuntimeProfile {
+    /// Standard runtime (selfhost/default)
+    Default,
+    /// Minimal runtime without FileSystem
+    NoFs,
+}
+
+impl RuntimeProfile {
+    /// Read RuntimeProfile from NYASH_RUNTIME_PROFILE environment variable
+    ///
+    /// # Recognized values
+    ///
+    /// - `"no-fs"` or `"nofs"` → NoFs
+    /// - Any other value or missing → Default
+    pub fn from_env() -> Self {
+        match std::env::var("NYASH_RUNTIME_PROFILE").as_deref() {
+            Ok("no-fs") | Ok("nofs") => RuntimeProfile::NoFs,
+            _ => RuntimeProfile::Default,
+        }
+    }
+
+    /// Get profile name for debugging
+    pub fn name(&self) -> &'static str {
+        match self {
+            RuntimeProfile::Default => "Default",
+            RuntimeProfile::NoFs => "NoFs",
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_runtime_profile_from_env_default() {
+        // Without setting env, should return Default
+        std::env::remove_var("NYASH_RUNTIME_PROFILE");
+        assert_eq!(RuntimeProfile::from_env(), RuntimeProfile::Default);
+    }
+
+    #[test]
+    fn test_runtime_profile_from_env_nofs() {
+        // Test "no-fs" variant
+        std::env::set_var("NYASH_RUNTIME_PROFILE", "no-fs");
+        assert_eq!(RuntimeProfile::from_env(), RuntimeProfile::NoFs);
+
+        // Test "nofs" variant
+        std::env::set_var("NYASH_RUNTIME_PROFILE", "nofs");
+        assert_eq!(RuntimeProfile::from_env(), RuntimeProfile::NoFs);
+
+        std::env::remove_var("NYASH_RUNTIME_PROFILE");
+    }
+
+    #[test]
+    fn test_runtime_profile_name() {
+        assert_eq!(RuntimeProfile::Default.name(), "Default");
+        assert_eq!(RuntimeProfile::NoFs.name(), "NoFs");
+    }
+}