diff --git a/docker-dev/docker-compose.yml b/docker-dev/docker-compose.yml
index 976cd354..9e1069a7 100644
--- a/docker-dev/docker-compose.yml
+++ b/docker-dev/docker-compose.yml
@@ -345,7 +345,7 @@ services:
       # actor-path suffix, because a doubled suffix resolves to nothing and drops every ack in
       # silence. Both central nodes are listed so a driver node's client can rotate to whichever one
       # is up — that rotation is why the comm actors are per-node and NOT cluster singletons.
-      MeshTransport__Mode: "${OTOPCUA_MESH_MODE:-ClusterClient}"
+      MeshTransport__Mode: "${OTOPCUA_MESH_MODE:-Grpc}"
       MeshTransport__CentralContactPoints__0: "akka.tcp://otopcua@central-1:4053"
       MeshTransport__CentralContactPoints__1: "akka.tcp://otopcua@central-2:4053"
       # gRPC command transport (Phase 0 of the ClusterClient→gRPC migration, docs/plans/2026-08-06-
@@ -484,7 +484,7 @@ services:
       # actor-path suffix, because a doubled suffix resolves to nothing and drops every ack in
       # silence. Both central nodes are listed so a driver node's client can rotate to whichever one
       # is up — that rotation is why the comm actors are per-node and NOT cluster singletons.
-      MeshTransport__Mode: "${OTOPCUA_MESH_MODE:-ClusterClient}"
+      MeshTransport__Mode: "${OTOPCUA_MESH_MODE:-Grpc}"
       MeshTransport__CentralContactPoints__0: "akka.tcp://otopcua@central-1:4053"
       MeshTransport__CentralContactPoints__1: "akka.tcp://otopcua@central-2:4053"
       # gRPC command transport (Phase 0) — see central-1. SHIPPED DARK (Mode stays ClusterClient).
@@ -613,7 +613,7 @@ services:
       # actor-path suffix, because a doubled suffix resolves to nothing and drops every ack in
       # silence. Both central nodes are listed so a driver node's client can rotate to whichever one
       # is up — that rotation is why the comm actors are per-node and NOT cluster singletons.
-      MeshTransport__Mode: "${OTOPCUA_MESH_MODE:-ClusterClient}"
+      MeshTransport__Mode: "${OTOPCUA_MESH_MODE:-Grpc}"
       MeshTransport__CentralContactPoints__0: "akka.tcp://otopcua@central-1:4053"
       MeshTransport__CentralContactPoints__1: "akka.tcp://otopcua@central-2:4053"
       # gRPC command transport (Phase 0) — see central-1. SHIPPED DARK (Mode stays ClusterClient).
@@ -727,7 +727,7 @@ services:
       # actor-path suffix, because a doubled suffix resolves to nothing and drops every ack in
       # silence. Both central nodes are listed so a driver node's client can rotate to whichever one
       # is up — that rotation is why the comm actors are per-node and NOT cluster singletons.
-      MeshTransport__Mode: "${OTOPCUA_MESH_MODE:-ClusterClient}"
+      MeshTransport__Mode: "${OTOPCUA_MESH_MODE:-Grpc}"
       MeshTransport__CentralContactPoints__0: "akka.tcp://otopcua@central-1:4053"
       MeshTransport__CentralContactPoints__1: "akka.tcp://otopcua@central-2:4053"
       # gRPC command transport (Phase 0) — see central-1/site-a-1. SHIPPED DARK. Same SITE-A key as
@@ -820,7 +820,7 @@ services:
       # actor-path suffix, because a doubled suffix resolves to nothing and drops every ack in
       # silence. Both central nodes are listed so a driver node's client can rotate to whichever one
       # is up — that rotation is why the comm actors are per-node and NOT cluster singletons.
-      MeshTransport__Mode: "${OTOPCUA_MESH_MODE:-ClusterClient}"
+      MeshTransport__Mode: "${OTOPCUA_MESH_MODE:-Grpc}"
       MeshTransport__CentralContactPoints__0: "akka.tcp://otopcua@central-1:4053"
       MeshTransport__CentralContactPoints__1: "akka.tcp://otopcua@central-2:4053"
       # gRPC command transport (Phase 0) — see central-1. SHIPPED DARK. GrpcPsk is this node's own
@@ -898,7 +898,7 @@ services:
       # actor-path suffix, because a doubled suffix resolves to nothing and drops every ack in
       # silence. Both central nodes are listed so a driver node's client can rotate to whichever one
       # is up — that rotation is why the comm actors are per-node and NOT cluster singletons.
-      MeshTransport__Mode: "${OTOPCUA_MESH_MODE:-ClusterClient}"
+      MeshTransport__Mode: "${OTOPCUA_MESH_MODE:-Grpc}"
       MeshTransport__CentralContactPoints__0: "akka.tcp://otopcua@central-1:4053"
       MeshTransport__CentralContactPoints__1: "akka.tcp://otopcua@central-2:4053"
       # gRPC command transport (Phase 0) — see central-1/site-b-1. SHIPPED DARK. Same SITE-B key as