feat(naming): Phase 25.4-A - NamingBox SSOT化完了

🎯 目的: static/global 呼び出しの名前決定を src/mir/naming.rs に一本化

✅ 実装完了:
- NamingBox（src/mir/naming.rs）実装
  - encode_static_method(box, method, arity)
  - normalize_static_global_name(func_name)
  - static/global 名前の正規化ロジック統一

- MIR Builder統合（SSOT使用）
  - src/mir/builder/decls.rs: build_static_main_box
  - src/mir/builder/exprs.rs: 静的メソッド呼び出し
  - src/mir/builder/metadata/propagate.rs: メタデータ伝播
  - src/mir/builder/observe/mod.rs: Observe機能
  - src/mir/builder/observe/types.rs: 型観測（新規）

- VM実行器統合（SSOT使用）
  - src/backend/mir_interpreter/handlers/calls/global.rs
  - normalize_static_global_name使用
  - レガシーフォールバック削除済み確認

- テスト追加
  - src/tests/mir_static_box_naming.rs
  - encode/normalize の動作検証

📚 ドキュメント:
- docs/development/architecture/mir-naming-box.md
  - NamingBoxの設計思想
  - SSOT原則の説明
  - 使用例

🎯 効果:
- 名前決定ロジックが1箇所に集約
- Builder/VM で同じ正規化ルールを使用
- 将来の名前空間拡張が容易

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

src/mir/builder/exprs.rs

@@ -3,6 +3,7 @@ use super::{MirInstruction, ValueId};
 use crate::ast::{
     ASTNode, AssignStmt, BinaryExpr, CallExpr, FieldAccessExpr, MethodCallExpr, ReturnStmt,
 };
+use crate::mir::builder::observe::types as type_trace;
 
 impl super::MirBuilder {
     // Main expression dispatcher
@@ -295,10 +296,20 @@ impl super::MirBuilder {
                     args: vec![],
                     effects: super::EffectMask::MUT,
                 })?;
-                self.value_origin_newbox
-                    .insert(arr_id, "ArrayBox".to_string());
+                self.value_origin_newbox.insert(arr_id, "ArrayBox".to_string());
                 self.value_types
                     .insert(arr_id, super::MirType::Box("ArrayBox".to_string()));
+                // TypeRegistry + trace for deterministic debug
+                self.type_registry
+                    .record_newbox(arr_id, "ArrayBox".to_string());
+                self.type_registry
+                    .record_type(arr_id, super::MirType::Box("ArrayBox".to_string()));
+                type_trace::origin("newbox:ArrayLiteral", arr_id, "ArrayBox");
+                type_trace::ty(
+                    "newbox:ArrayLiteral",
+                    arr_id,
+                    &super::MirType::Box("ArrayBox".to_string()),
+                );
                 for e in elements {
                     let v = self.build_expression_impl(e)?;
                     self.emit_instruction(MirInstruction::BoxCall {
@@ -328,10 +339,19 @@ impl super::MirBuilder {
                     args: vec![],
                     effects: super::EffectMask::MUT,
                 })?;
-                self.value_origin_newbox
-                    .insert(map_id, "MapBox".to_string());
+                self.value_origin_newbox.insert(map_id, "MapBox".to_string());
                 self.value_types
                     .insert(map_id, super::MirType::Box("MapBox".to_string()));
+                self.type_registry
+                    .record_newbox(map_id, "MapBox".to_string());
+                self.type_registry
+                    .record_type(map_id, super::MirType::Box("MapBox".to_string()));
+                type_trace::origin("newbox:MapLiteral", map_id, "MapBox");
+                type_trace::ty(
+                    "newbox:MapLiteral",
+                    map_id,
+                    &super::MirType::Box("MapBox".to_string()),
+                );
                 for (k, expr) in entries {
                     // const string key
                     let k_id = crate::mir::builder::emission::constant::emit_string(self, k);