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---
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`
## P1: Allow Seq-of-effects in CoreLoopPlan body (flatten)
- 指示書: `docs/development/current/main/phases/phase-29am/P1-CORELOOP-BODY-SEQ-FLATTEN-INSTRUCTIONS.md`
- ねらい: ループ body_bb では “Effect だけ” を前提にしつつ、`Seq([Effect...])` を安全に flatten して emit できるようにする
- 非目的: `If/Exit` を body_bb に入れる(これは Frag/ExitMap 側の語彙で表現する)