diff --git a/policy/architecture-baseline.json b/policy/architecture-baseline.json
index eac1c9cb..d9dafb11 100644
--- a/policy/architecture-baseline.json
+++ b/policy/architecture-baseline.json
@@ -12,6 +12,7 @@
 "backend/app backend/pgbus",
 "backend/app backend/plugins",
 "backend/app backend/profiles",
+"backend/app backend/projectscope",
 "backend/app backend/prompts",
 "backend/app backend/rag",
 "backend/app backend/ratelimit",
@@ -35,6 +36,7 @@
 "backend/plugins backend/tools",
 "backend/plugins backend/workflow",
 "backend/profiles backend/store",
+"backend/projectscope backend/store",
 "backend/prompts backend/store",
 "backend/rag backend/settings",
 "backend/rag backend/store",
@@ -63,6 +65,7 @@
 "backend/server backend/intentgate",
 "backend/server backend/plugins",
 "backend/server backend/profiles",
+"backend/server backend/projectscope",
 "backend/server backend/prompts",
 "backend/server backend/ratelimit",
 "backend/server backend/route",
diff --git a/policy/architecture.yaml b/policy/architecture.yaml
index af5b48fa..06af4c4e 100644
--- a/policy/architecture.yaml
+++ b/policy/architecture.yaml
@@ -1,5 +1,8 @@
 # 分层棘轮。新增跨组依赖边失败，消失的边只告警。
 # 基线见 architecture-baseline.json。改分层先改本文件，再更新基线。
+# projectscope is the shared private projection resolver used by app and server;
+# it queries store metadata and does not depend on either transport/composition root.
+# Approved membership proposal r1 adds app/server -> projectscope -> store.
 backend:
   root: modules/backend/internal
   import_prefix: agent-system-backend/internal/