docs(phase29ao): add p42 stage3 design entry

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

@@ -3,7 +3,7 @@
 ## Current Focus
 
 - Phase: `docs/development/current/main/phases/phase-29ao/README.md`
-- Next: `docs/development/current/main/phases/phase-29ao/P42-STAGE3-CORELOOPCOMPOSER-V0-DESIGN-INSTRUCTIONS.md`
+- Next: TBD (see `docs/development/current/main/phases/phase-29ao/README.md`)
 
 ## Gate (SSOT)
 

docs/development/current/main/30-Backlog.md

@@ -5,7 +5,7 @@ Scope: 「次にやる候補」を短く列挙するメモ。入口は `docs/dev
 
 ## Active
 
-- CorePlan migration: `docs/development/current/main/phases/phase-29ao/README.md`（Next: P42）
+- CorePlan migration: `docs/development/current/main/phases/phase-29ao/README.md`（Next: TBD）
 
 ## Near-Term Candidates
 

docs/development/current/main/design/coreplan-migration-roadmap-ssot.md

@@ -34,7 +34,7 @@ Related:
 ## 1.1 Current (active)
 
 - Active phase: `docs/development/current/main/phases/phase-29ao/README.md`
-- Next step: `docs/development/current/main/phases/phase-29ao/P42-STAGE3-CORELOOPCOMPOSER-V0-DESIGN-INSTRUCTIONS.md`
+- Next step: TBD
 
 ## 2. すでに固めた SSOT（再発防止の土台）
 

docs/development/current/main/phases/phase-29ao/README.md

@@ -231,7 +231,11 @@ Gate（SSOT）:
 - 指示書: `docs/development/current/main/phases/phase-29ao/P41-RELEASE-ADOPT-PATTERN5-INFINITE-EARLY-EXIT-SUBSET-INSTRUCTIONS.md`
 - ねらい: Pattern5 planner subset を release 既定で Facts→CorePlan に採用し、非strict経路の回帰を追加（仕様不変）
 
+## P42: Stage-3 design — CoreLoopComposer v0 (Skeleton+Feature) ✅
+
+- 指示書: `docs/development/current/main/phases/phase-29ao/P42-STAGE3-CORELOOPCOMPOSER-V0-DESIGN-INSTRUCTIONS.md`
+- ねらい: Skeleton+Feature 合成による CoreLoopComposer v0 の境界を SSOT で固定（docs-first, 仕様不変）
+
 ## Next（planned）
 
-- Next: P42（Stage-3 design: Skeleton+Feature → CoreLoopComposer v0）
-- 指示書: `docs/development/current/main/phases/phase-29ao/P42-STAGE3-CORELOOPCOMPOSER-V0-DESIGN-INSTRUCTIONS.md`
+- Next: TBD