---
Status: Active
Scope: CorePlan 実装準備（lowerer/verifier の穴埋め、仕様不変で段階導入）
Related:
- docs/development/current/main/design/coreplan-migration-roadmap-ssot.md
- docs/development/current/main/design/effect-classification-ssot.md
- docs/development/current/main/design/exitkind-cleanup-effect-contract-ssot.md
- docs/development/current/main/phases/phase-29ae/README.md
---

# Phase 29am: CorePlan Step-A implementation (lowerer/verifier)

Goal: CorePlan で“組み立てる”移行を進める前に、`CorePlan` の語彙が単独でも lower/verify できる状態へ近づける。

SSOT 道筋: `docs/development/current/main/design/coreplan-migration-roadmap-ssot.md`

## P0: Implement CorePlan::If / CorePlan::Exit lowering (minimal)

- 指示書: `docs/development/current/main/phases/phase-29am/P0-COREPLAN-LOWERER-IF-EXIT-INSTRUCTIONS.md`
- ねらい: 既存のルーティング/観測を変えずに、CorePlan 側の “未対応エラー” を減らす（仕様不変）
- Gate: `./tools/smokes/v2/profiles/integration/joinir/phase29ae_regression_pack_vm.sh`