docs(phase29ap): closeout legacy removal

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

@@ -5,8 +5,12 @@ Scope: 「次にやる候補」を短く列挙するメモ。入口は `docs/dev
 
 ## Active
 
-- Phase 29ap: `docs/development/current/main/phases/phase-29ap/README.md` (Next: P14 planned)
+- Next phase TBD: choose between Plan/Composer subset expansion or CorePlan vocabulary expansion
 - JoinIR regression gate SSOT: `docs/development/current/main/phases/phase-29ae/README.md`
 - CorePlan hardening (docs-first): `docs/development/current/main/phases/phase-29al/README.md`
 
+## Complete
+
+- Phase 29ap: `docs/development/current/main/phases/phase-29ap/README.md`
+
 Archive: `docs/development/current/main/phases/phase-29ao/30-Backlog-archive.md`