Phase 12: 統一TypeBox ABI実装開始 - ChatGPT5による極小コアABI基盤構築

- TypeBox ABI雛形: メソッドスロット管理システム追加
- Type Registry: Array/Map/StringBoxの基本メソッド定義
- Host API: C ABI逆呼び出しシステム実装
- Phase 12ドキュメント整理: 設計文書統合・アーカイブ化
- MIR Builder: クリーンアップと分離実装完了

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

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

docs/development/mir/MIR_BUILDER_MODULES.md

@@ -0,0 +1,31 @@
+# MIR Builder Modules (Current Split)
+
+This note summarizes the current split of the MIR builder to keep `builder.rs` thin and maintainable.
+
+Paths:
+- `src/mir/builder.rs`: Thin hub for MIR building; owns state (generators, maps) and high‑level coordination.
+- `src/mir/builder/stmts.rs`: Statement builders
+  - `build_print_statement`, `build_block`, `build_if_statement`, `build_loop_statement`,
+    `build_try_catch_statement`, `build_throw_statement`, `build_local_statement`,
+    `build_return_statement`, `build_nowait_statement`, `build_await_expression`, `build_me_expression`.
+- `src/mir/builder/ops.rs`: Expression ops
+  - `build_binary_op`, `build_unary_op`, `convert_binary_operator`, `convert_unary_operator`.
+- `src/mir/builder/utils.rs`: Shared utilities
+  - `resolve_include_path_builder`, `builder_debug_enabled`, `builder_debug_log`, `infer_type_from_phi`.
+- Calls: `src/mir/builder/builder_calls.rs`
+  - `build_function_call`, `build_method_call`, `build_from_expression`,
+    `lower_method_as_function`, `lower_static_method_as_function`,
+    `parse_type_name_to_mir`, `extract_string_literal`.
+
+Notes:
+- `builder.rs` now stays < 1,000 LOC by delegating to the above modules.
+- No behavior change intended; only mechanical movement. jit‑direct smokes remain green.
+- Debug logs remain gated by `NYASH_BUILDER_DEBUG=1`.
+
+Run checks:
+- Build (JIT): `cargo build --release --features cranelift-jit`
+- jit‑direct smokes:
+  - `NYASH_JIT_THRESHOLD=1 ./target/release/nyash --jit-direct apps/tests/mir-branch-ret/main.nyash`
+  - `NYASH_JIT_THRESHOLD=1 ./target/release/nyash --jit-direct apps/tests/mir-phi-min/main.nyash`
+  - `NYASH_JIT_THRESHOLD=1 ./target/release/nyash --jit-direct apps/tests/mir-branch-multi/main.nyash`
+