🎉 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_lambda.rs

@@ -0,0 +1,67 @@
+use super::ValueId;
+use crate::ast::ASTNode;
+
+impl super::MirBuilder {
+    // Lambda lowering to FunctionNew
+    pub(super) fn build_lambda_expression(
+        &mut self,
+        params: Vec<String>,
+        body: Vec<ASTNode>,
+    ) -> Result<ValueId, String> {
+        use std::collections::HashSet;
+        let mut used: HashSet<String> = HashSet::new();
+        let mut locals: HashSet<String> = HashSet::new();
+        for p in &params { locals.insert(p.clone()); }
+        fn collect_vars(ast: &ASTNode, used: &mut std::collections::HashSet<String>, locals: &mut std::collections::HashSet<String>) {
+            match ast {
+                ASTNode::Variable { name, .. } => { if !locals.contains(name) { used.insert(name.clone()); } }
+                ASTNode::Assignment { target, value, .. } => { collect_vars(target, used, locals); collect_vars(value, used, locals); }
+                ASTNode::BinaryOp { left, right, .. } => { collect_vars(left, used, locals); collect_vars(right, used, locals); }
+                ASTNode::UnaryOp { operand, .. } => { collect_vars(operand, used, locals); }
+                ASTNode::MethodCall { object, arguments, .. } => { collect_vars(object, used, locals); for a in arguments { collect_vars(a, used, locals); } }
+                ASTNode::FunctionCall { arguments, .. } => { for a in arguments { collect_vars(a, used, locals); } }
+                ASTNode::Call { callee, arguments, .. } => { collect_vars(callee, used, locals); for a in arguments { collect_vars(a, used, locals); } }
+                ASTNode::FieldAccess { object, .. } => { collect_vars(object, used, locals); }
+                ASTNode::New { arguments, .. } => { for a in arguments { collect_vars(a, used, locals); } }
+                ASTNode::If { condition, then_body, else_body, .. } => {
+                    collect_vars(condition, used, locals);
+                    for st in then_body { collect_vars(st, used, locals); }
+                    if let Some(eb) = else_body { for st in eb { collect_vars(st, used, locals); } }
+                }
+                ASTNode::Loop { condition, body, .. } => { collect_vars(condition, used, locals); for st in body { collect_vars(st, used, locals); } }
+                ASTNode::TryCatch { try_body, catch_clauses, finally_body, .. } => {
+                    for st in try_body { collect_vars(st, used, locals); }
+                    for c in catch_clauses { for st in &c.body { collect_vars(st, used, locals); } }
+                    if let Some(fb) = finally_body { for st in fb { collect_vars(st, used, locals); } }
+                }
+                ASTNode::Throw { expression, .. } => { collect_vars(expression, used, locals); }
+                ASTNode::Print { expression, .. } => { collect_vars(expression, used, locals); }
+                ASTNode::Return { value, .. } => { if let Some(v) = value { collect_vars(v, used, locals); } }
+                ASTNode::AwaitExpression { expression, .. } => { collect_vars(expression, used, locals); }
+                ASTNode::PeekExpr { scrutinee, arms, else_expr, .. } => {
+                    collect_vars(scrutinee, used, locals);
+                    for (_, e) in arms { collect_vars(e, used, locals); }
+                    collect_vars(else_expr, used, locals);
+                }
+                ASTNode::Program { statements, .. } => { for st in statements { collect_vars(st, used, locals); } }
+                ASTNode::FunctionDeclaration { params, body, .. } => {
+                    let mut inner = locals.clone();
+                    for p in params { inner.insert(p.clone()); }
+                    for st in body { collect_vars(st, used, &mut inner); }
+                }
+                _ => {}
+            }
+        }
+        for st in body.iter() { collect_vars(st, &mut used, &mut locals); }
+        let mut captures: Vec<(String, ValueId)> = Vec::new();
+        for name in used.into_iter() {
+            if let Some(&vid) = self.variable_map.get(&name) { captures.push((name, vid)); }
+        }
+        let me = self.variable_map.get("me").copied();
+        let dst = self.value_gen.next();
+        self.emit_instruction(super::MirInstruction::FunctionNew { dst, params: params.clone(), body: body.clone(), captures, me })?;
+        self.value_types.insert(dst, crate::mir::MirType::Box("FunctionBox".to_string()));
+        Ok(dst)
+    }
+}
+