save checkpoint

docs/ARCHITECTURE_OVERVIEW.md

@@ -80,6 +80,21 @@ Stella Ops Suite organizes capabilities into **themes** (functional areas):
 | **Experience** | `StellaOps.Web`, `StellaOps.Cli`, `StellaOps.Notify`, `StellaOps.ExportCenter` | Operator UX, automation, notifications |
 | **Data Plane** | PostgreSQL, Valkey, RustFS/object storage | Canonical store, queues, artifact storage |
 
+### Ownership Clarifications
+
+- **Ingress/routing**: Gateway is the single HTTP ingress and Router is the
+  internal service transport.
+- **Promotion policy gates**: Policy Engine owns PASS/FAIL decision semantics;
+  Concelier remains ingestion/linkset only.
+- **Environment topology and promotion lanes**: owned by Release Orchestrator
+  ENVMGR/PROMOT tracks (not Cartographer).
+
+See:
+- `docs/modules/gateway/architecture.md`
+- `docs/modules/router/README.md`
+- `docs/modules/policy/promotion-gate-ownership-contract.md`
+- `docs/modules/release-orchestrator/promotion-runtime-gap-closure-plan.md`
+
 ## Infrastructure (What Is Required)
 
 **Required**