docs(phase29an): add p15 closeout; start phase29ao

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

@@ -10,9 +10,13 @@ Related:
 
 - **Phase 29an（active）: Skeleton/Feature Facts（SSOT）**
   - 入口: `docs/development/current/main/phases/phase-29an/README.md`
-  - 状況: P0（Ready）
+  - 状況: P0–P14 ✅ 完了 / Next: P15 closeout
   - Gate: `./tools/smokes/v2/profiles/integration/joinir/phase29ae_regression_pack_vm.sh`
 
+- **Phase 29ao（candidate）: CorePlan composition from Skeleton/Feature**
+  - 入口: `docs/development/current/main/phases/phase-29ao/README.md`
+  - 状況: P0（Ready: composer scaffold）
+
 - **Phase 29af（✅ COMPLETE）: Boundary hygiene / regression entrypoint / carrier layout SSOT**
   - 入口: `docs/development/current/main/phases/phase-29af/README.md`