phase29ag(p1): remap via boundary.join_inputs

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

@@ -2,7 +2,10 @@
 
 ## Current Focus: Phase 29ag（JoinIR merge SSOT unification）
 
-Next: `docs/development/current/main/phases/phase-29ag/P0-COORDINATOR-USES-BOUNDARY-CARRIER-LAYOUT-INSTRUCTIONS.md`
+**2025-12-29: Phase 29ag P1 完了** ✅
+- 目的: coordinator の ValueId(idx) 前提を撤去し、boundary.join_inputs を SSOT 化（仕様不変）
+- 入口: `docs/development/current/main/phases/phase-29ag/README.md`
+- 検証: `cargo build --release` / `./tools/smokes/v2/run.sh --profile quick` / `./tools/smokes/v2/profiles/integration/joinir/phase29ae_regression_pack_vm.sh` PASS
 
 **2025-12-29: Phase 29af P5 完了** ✅
 - 目的: 29af を closeout して JoinIR 回帰確認を 1 本に収束（仕様不変）