phase29af(p2+p3): regression entrypoint + carrier layout ssot

docs/development/current/main/10-Now.md

@@ -2,11 +2,17 @@
 
 ## Current Focus: Phase 29af（Boundary Hygiene SSOT 固定）
 
+**2025-12-29: Phase 29af P3 完了** ✅
+- 目的: carrier の順序（loop_var + carriers）を merge 側 SSOT に統合（仕様不変）
+- 入口: `src/mir/builder/control_flow/joinir/merge/boundary_carrier_layout.rs`
+- 検証: `cargo build --release` / `./tools/smokes/v2/profiles/integration/joinir/phase29ae_regression_pack_vm.sh` / `./tools/smokes/v2/run.sh --profile quick` PASS
+
 **2025-12-29: Phase 29af P1 完了** ✅
 - 目的: boundary hygiene を merge 入口（`contract_checks`）へ集約して再発検知を SSOT 化（仕様不変）
 - 実装: `src/mir/builder/control_flow/joinir/merge/contract_checks/boundary_hygiene.rs`（strict/dev のみ）
 - 配線: `src/mir/builder/control_flow/joinir/merge/contract_checks/boundary_creation.rs`
 - 検証: `cargo build --release` / `./tools/smokes/v2/run.sh --profile quick` / `./tools/smokes/v2/run.sh --profile integration --filter "phase29ab_pattern2_"` / `./tools/smokes/v2/run.sh --profile integration --filter "phase1883_"` PASS
+- JoinIR 回帰確認: `./tools/smokes/v2/profiles/integration/joinir/phase29ae_regression_pack_vm.sh`
 
 **2025-12-29: Phase 29af P0 完了** ✅
 - 目的: Pattern2 の boundary 情報の歪みを SSOT 化し、exit/header/latch の責務境界を固定（仕様不変）