refactor(deploy): retire cross-cluster DeployInstanceCommand wire path (config now fetched)

src/ZB.MOM.WW.ScadaBridge.Communication/Actors/SiteCommunicationActor.cs

@@ -92,11 +92,6 @@ public class SiteCommunicationActor : ReceiveActor, IWithTimers
         Receive<RegisterLocalHandler>(HandleRegisterLocalHandler);
 
         // Pattern 1: Instance Deployment — forward to Deployment Manager
-        Receive<DeployInstanceCommand>(msg =>
-        {
-            _log.Debug("Routing DeployInstanceCommand for {0} to DeploymentManager", msg.InstanceUniqueName);
-            _deploymentManagerProxy.Forward(msg);
-        });
         Receive<RefreshDeploymentCommand>(msg =>
         {
             _log.Debug("Routing RefreshDeploymentCommand for {0} to DeploymentManager", msg.InstanceUniqueName);

src/ZB.MOM.WW.ScadaBridge.Communication/CommunicationService.cs

@@ -116,29 +116,9 @@ public class CommunicationService
     // ── Pattern 1: Instance Deployment ──
 
     /// <summary>
-    /// Sends a deployment command for an instance to a site.
-    /// </summary>
-    /// <param name="siteId">The target site identifier.</param>
-    /// <param name="command">The deployment command.</param>
-    /// <param name="cancellationToken">Cancellation token.</param>
-    /// <returns>The deployment status response.</returns>
-    public async Task<DeploymentStatusResponse> DeployInstanceAsync(
-        string siteId, DeployInstanceCommand command, CancellationToken cancellationToken = default)
-    {
-        _logger.LogDebug(
-            "Sending DeployInstanceCommand to site {SiteId}, instance={Instance}, correlationId={DeploymentId}",
-            siteId, command.InstanceUniqueName, command.DeploymentId);
-
-        var envelope = new SiteEnvelope(siteId, command);
-        return await GetActor().Ask<DeploymentStatusResponse>(
-            envelope, _options.DeploymentTimeout, cancellationToken);
-    }
-
-    /// <summary>
-    /// Sends a small "refresh deployment" notify to a site (notify-and-fetch).
-    /// Replaces <see cref="DeployInstanceAsync"/> on the wire: the site fetches the
-    /// config over HTTP rather than receiving it inline. Reply is the existing
-    /// DeploymentStatusResponse, bounded by the deployment timeout.
+    /// Sends a small "refresh deployment" notify to a site (notify-and-fetch):
+    /// the site fetches the config over HTTP rather than receiving it inline.
+    /// Reply is the existing DeploymentStatusResponse, bounded by the deployment timeout.
     /// </summary>
     /// <param name="siteId">The target site identifier.</param>
     /// <param name="command">The refresh-deployment notify.</param>

src/ZB.MOM.WW.ScadaBridge.SiteRuntime/Actors/SiteReplicationActor.cs

@@ -154,9 +154,9 @@ public class SiteReplicationActor : ReceiveActor
     {
         if (string.IsNullOrEmpty(msg.CentralFetchBaseUrl))
         {
-            // The still-present direct DeployInstanceCommand wire path (retired in Task 14)
-            // replicates with empty coords; there is nothing to fetch. Skip quietly rather
-            // than calling FetchAsync("") and logging an error — T18 reconciliation backstops.
+            // The direct DeployInstanceCommand cross-cluster wire path was retired (Task 14).
+            // This guard is a defensive fallback: skip quietly rather than calling FetchAsync("")
+            // and logging a spurious error. T18 reconciliation backstops any missed writes.
             _logger.LogDebug(
                 "No fetch coords for {Instance} (deployment {DeploymentId}) — skipping replicated fetch; T18 reconciliation is the backstop",
                 msg.InstanceName, msg.DeploymentId);