🎉 Phase 11.8/12.7: MIR Core-13 完全実装 + 糖衣構文ドキュメント更新

主要な変更:
- MIR Core-13命令セット確定（Load/Store削除の革命的設計）
  - Const, BinOp, Compare（値・計算）
  - Jump, Branch, Return, Phi（制御）
  - Call, BoxCall, ExternCall（呼び出し）
  - TypeOp, Safepoint, Barrier（メタ）
- Phase 12.7糖衣構文ドキュメント整理（超圧縮重視、可逆変換保証）
- MIRビルダーのモジュール分割完了
- vtableテストスイート拡充
- AI協調開発ツール追加（並列リファクタリング支援）

詳細:
- src/mir/instruction_introspection.rs: core13_instruction_names()追加
- MIRビルダー分割: decls.rs, exprs_*.rs, fields.rs
- plugin_loader_v2: errors.rs, host_bridge.rs分離
- 論文用データ: mir13-final.md作成

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

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

src/mir/builder/exprs_include.rs

@@ -0,0 +1,27 @@
+use super::ValueId;
+
+impl super::MirBuilder {
+    // Include lowering: include "path"
+    pub(super) fn build_include_expression(&mut self, filename: String) -> Result<ValueId, String> {
+        let mut path = super::utils::resolve_include_path_builder(&filename);
+        if std::path::Path::new(&path).is_dir() { path = format!("{}/index.nyash", path.trim_end_matches('/')); }
+        else if std::path::Path::new(&path).extension().is_none() { path.push_str(".nyash"); }
+
+        if self.include_loading.contains(&path) { return Err(format!("Circular include detected: {}", path)); }
+        if let Some(name) = self.include_box_map.get(&path).cloned() { return self.build_new_expression(name, vec![]); }
+
+        self.include_loading.insert(path.clone());
+        let content = std::fs::read_to_string(&path).map_err(|e| format!("Include read error '{}': {}", filename, e))?;
+        let included_ast = crate::parser::NyashParser::parse_from_string(&content).map_err(|e| format!("Include parse error '{}': {:?}", filename, e))?;
+        let mut box_name: Option<String> = None;
+        if let crate::ast::ASTNode::Program { statements, .. } = &included_ast {
+            for st in statements { if let crate::ast::ASTNode::BoxDeclaration { name, is_static, .. } = st { if *is_static { box_name = Some(name.clone()); break; } } }
+        }
+        let bname = box_name.ok_or_else(|| format!("Include target '{}' has no static box", filename))?;
+        let _ = self.build_expression_impl(included_ast)?;
+        self.include_loading.remove(&path);
+        self.include_box_map.insert(path.clone(), bname.clone());
+        self.build_new_expression(bname, vec![])
+    }
+}
+