From 32d18141302f818f7ccea0ce7f3ae70a923a7028 Mon Sep 17 00:00:00 2001
From: nyash-codex <codex@nyash.local>
Date: Tue, 16 Dec 2025 06:51:00 +0900
Subject: [PATCH] =?UTF-8?q?refactor(mir):=20Phase=20138-P2-B=20-=20?=
 =?UTF-8?q?=E7=92=B0=E5=A2=83=E5=A4=89=E6=95=B0=E3=83=81=E3=82=A7=E3=83=83?=
 =?UTF-8?q?=E3=82=AF=E3=82=92SSOT=E5=8C=96?=
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## 概要
- parity_checker.rs の直接環境変数呼び出しを削除
- joinir_dev::strict_enabled() 呼び出しに統一

## 変更内容
- std::env::var("HAKO_JOINIR_STRICT") 等の直呼び出し削除
- use crate::config::env::joinir_dev; 追加
- joinir_dev::strict_enabled() に置換

## DRY原則達成
- 環境変数チェックロジックが1箇所に集約
- 将来の変更が容易（SSOT）

## テスト結果
- 2 tests passed (parity_checker::tests::*)
---
 src/mir/builder/control_flow/joinir/parity_checker.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/mir/builder/control_flow/joinir/parity_checker.rs b/src/mir/builder/control_flow/joinir/parity_checker.rs
index a79c4f7e..34e6cdd6 100644
--- a/src/mir/builder/control_flow/joinir/parity_checker.rs
+++ b/src/mir/builder/control_flow/joinir/parity_checker.rs
@@ -45,9 +45,9 @@ impl MirBuilder {
                     func_name, canonical_pattern, actual_pattern
                 );
 
-                // Check strict mode (NOTE: Will be replaced with SSOT in Phase 138-P2-B)
-                let is_strict = std::env::var("HAKO_JOINIR_STRICT").is_ok()
-                    || std::env::var("NYASH_JOINIR_STRICT").is_ok();
+                // Phase 138-P2-B: Use SSOT for environment variable check
+                use crate::config::env::joinir_dev;
+                let is_strict = joinir_dev::strict_enabled();
 
                 if is_strict {
                     // Strict mode: fail fast