diff --git a/phases/cpp-object-oriented-modular-refactoring/index.json b/phases/cpp-object-oriented-modular-refactoring/index.json
index 05a0e9b..3f22606 100644
--- a/phases/cpp-object-oriented-modular-refactoring/index.json
+++ b/phases/cpp-object-oriented-modular-refactoring/index.json
@@ -21,7 +21,10 @@
     {
       "step": 2,
       "name": "architecture-boundaries",
-      "status": "pending"
+      "status": "completed",
+      "summary": "Documentation-only: ARCHITECTURE/ADR now fix Domain unique_ptr/stable-index ownership, ElementDefinition/runtime ElementFactory separation, generic element/load/constraint pipeline boundaries, minimal Analysis::Run with a private LinearStaticAnalysis lifecycle, and facade module splits while preserving B33/MITC4/HDF5/reference contracts; contract rg, git diff --check, MSVC Debug build, CTest discovery, and full CTest 144/144 passed.",
+      "started_at": "2026-08-16T03:19:17+0900",
+      "completed_at": "2026-08-16T03:27:17+0900"
     },
     {
       "step": 3,