🎉 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/tests/vtable_string_p1.rs

@@ -0,0 +1,53 @@
+#[test]
+fn vtable_string_indexof_replace_trim_upper_lower() {
+    use crate::backend::vm::VM;
+    use crate::mir::{MirModule, MirFunction, FunctionSignature, MirInstruction, EffectMask, BasicBlockId, ConstValue, MirType};
+    std::env::set_var("NYASH_ABI_VTABLE", "1");
+
+    // indexOf("b") in "abc" == 1
+    let sig = FunctionSignature { name: "main".into(), params: vec![], return_type: MirType::Integer, effects: EffectMask::PURE };
+    let mut f = MirFunction::new(sig, BasicBlockId::new(0));
+    let bb = f.entry_block;
+    let s = f.next_value_id(); f.get_block_mut(bb).unwrap().add_instruction(MirInstruction::Const { dst: s, value: ConstValue::String("abc".into()) });
+    let sb = f.next_value_id(); f.get_block_mut(bb).unwrap().add_instruction(MirInstruction::NewBox { dst: sb, box_type: "StringBox".into(), args: vec![s] });
+    let b = f.next_value_id(); f.get_block_mut(bb).unwrap().add_instruction(MirInstruction::Const { dst: b, value: ConstValue::String("b".into()) });
+    let idx = f.next_value_id();
+    f.get_block_mut(bb).unwrap().add_instruction(MirInstruction::BoxCall { dst: Some(idx), box_val: sb, method: "indexOf".into(), args: vec![b], method_id: None, effects: EffectMask::PURE });
+    f.get_block_mut(bb).unwrap().add_instruction(MirInstruction::Return { value: Some(idx) });
+    let mut m = MirModule::new("str_indexof".into()); m.add_function(f);
+    let mut vm = VM::new();
+    let out = vm.execute_module(&m).expect("vm exec");
+    assert_eq!(out.to_string_box().value, "1");
+
+    // replace: "a-b" -> replace("-","+") == "a+b"
+    let sig2 = FunctionSignature { name: "main".into(), params: vec![], return_type: MirType::String, effects: EffectMask::PURE };
+    let mut f2 = MirFunction::new(sig2, BasicBlockId::new(0));
+    let bb2 = f2.entry_block;
+    let s2 = f2.next_value_id(); f2.get_block_mut(bb2).unwrap().add_instruction(MirInstruction::Const { dst: s2, value: ConstValue::String("a-b".into()) });
+    let sb2 = f2.next_value_id(); f2.get_block_mut(bb2).unwrap().add_instruction(MirInstruction::NewBox { dst: sb2, box_type: "StringBox".into(), args: vec![s2] });
+    let dash = f2.next_value_id(); f2.get_block_mut(bb2).unwrap().add_instruction(MirInstruction::Const { dst: dash, value: ConstValue::String("-".into()) });
+    let plus = f2.next_value_id(); f2.get_block_mut(bb2).unwrap().add_instruction(MirInstruction::Const { dst: plus, value: ConstValue::String("+".into()) });
+    let rep = f2.next_value_id();
+    f2.get_block_mut(bb2).unwrap().add_instruction(MirInstruction::BoxCall { dst: Some(rep), box_val: sb2, method: "replace".into(), args: vec![dash, plus], method_id: None, effects: EffectMask::PURE });
+    f2.get_block_mut(bb2).unwrap().add_instruction(MirInstruction::Return { value: Some(rep) });
+    let mut m2 = MirModule::new("str_replace".into()); m2.add_function(f2);
+    let mut vm2 = VM::new();
+    let out2 = vm2.execute_module(&m2).expect("vm exec");
+    assert_eq!(out2.to_string_box().value, "a+b");
+
+    // trim + toUpper + toLower: "  Xy  " -> trim=="Xy" -> upper=="XY" -> lower=="xy"
+    let sig3 = FunctionSignature { name: "main".into(), params: vec![], return_type: MirType::String, effects: EffectMask::PURE };
+    let mut f3 = MirFunction::new(sig3, BasicBlockId::new(0));
+    let bb3 = f3.entry_block;
+    let s3 = f3.next_value_id(); f3.get_block_mut(bb3).unwrap().add_instruction(MirInstruction::Const { dst: s3, value: ConstValue::String("  Xy  ".into()) });
+    let sb3 = f3.next_value_id(); f3.get_block_mut(bb3).unwrap().add_instruction(MirInstruction::NewBox { dst: sb3, box_type: "StringBox".into(), args: vec![s3] });
+    let t = f3.next_value_id(); f3.get_block_mut(bb3).unwrap().add_instruction(MirInstruction::BoxCall { dst: Some(t), box_val: sb3, method: "trim".into(), args: vec![], method_id: None, effects: EffectMask::PURE });
+    let u = f3.next_value_id(); f3.get_block_mut(bb3).unwrap().add_instruction(MirInstruction::BoxCall { dst: Some(u), box_val: t, method: "toUpper".into(), args: vec![], method_id: None, effects: EffectMask::PURE });
+    let l = f3.next_value_id(); f3.get_block_mut(bb3).unwrap().add_instruction(MirInstruction::BoxCall { dst: Some(l), box_val: u, method: "toLower".into(), args: vec![], method_id: None, effects: EffectMask::PURE });
+    f3.get_block_mut(bb3).unwrap().add_instruction(MirInstruction::Return { value: Some(l) });
+    let mut m3 = MirModule::new("str_trim_upper_lower".into()); m3.add_function(f3);
+    let mut vm3 = VM::new();
+    let out3 = vm3.execute_module(&m3).expect("vm exec");
+    assert_eq!(out3.to_string_box().value, "xy");
+}
+