🎉 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_qmark.rs

@@ -0,0 +1,34 @@
+use super::ValueId;
+use crate::ast::ASTNode;
+
+impl super::MirBuilder {
+    // QMarkPropagate: result?.value (Result-like)
+    pub(super) fn build_qmark_propagate_expression(&mut self, expression: ASTNode) -> Result<ValueId, String> {
+        let res_val = self.build_expression_impl(expression)?;
+        let ok_id = self.value_gen.next();
+        self.emit_instruction(super::MirInstruction::BoxCall {
+            dst: Some(ok_id),
+            box_val: res_val,
+            method: "isOk".to_string(),
+            args: vec![],
+            method_id: None,
+            effects: super::EffectMask::PURE,
+        })?;
+        let then_block = self.block_gen.next();
+        let else_block = self.block_gen.next();
+        self.emit_instruction(super::MirInstruction::Branch { condition: ok_id, then_bb: then_block, else_bb: else_block })?;
+        self.start_new_block(then_block)?;
+        self.emit_instruction(super::MirInstruction::Return { value: Some(res_val) })?;
+        self.start_new_block(else_block)?;
+        let val_id = self.value_gen.next();
+        self.emit_instruction(super::MirInstruction::BoxCall {
+            dst: Some(val_id),
+            box_val: res_val,
+            method: "getValue".to_string(),
+            args: vec![],
+            method_id: None,
+            effects: super::EffectMask::PURE,
+        })?;
+        Ok(val_id)
+    }
+}