Resolve all 33 medium-severity architecture review findings

Second slice of the 2026-09-09 whole-system review remediation
(docs/plans/2026-09-09-arch-review.md §10), on top of the High slice 146a1323.

Runtime/devices: SR-2 alarm on-trigger integration scope; SR-3 correlated NativeAlarmActor
subscribe retry; SR-4 immutable audited DB target; SR-5 ordered InstanceActor stop/flush;
SR-12 rehydration fence; SR-13 S&F gate recheck per delivery; DC-4 no OPC UA security
downgrade; DC-5 alarm snapshot for every new subscriber; ORCH-1 sync-dispose joins the pump.

Management/UI: MG-2 site scope on audit tree + Flow Debugger Replay; MG-3 stale-probe memo
removed; MG-4 server-owned bulk-deploy deadline; UI-5 sandbox runs in a killable child
process (new CentralUI.SandboxWorker project); UI-14 bounded sandbox output/IPC.

Edge/audit: EI-1 relay audit ownership; EI-2 SkipBodyCapture suppresses error text; EI-3/EI-11
error-field redaction + caps; EI-4 single relay deadline, pre-execution-only retry; EI-5
authenticated relay provenance; EI-10 body cap before audit read.

Persistence/contracts: DL-1 global Instance.UniqueName unique index + conflict translation;
DL-2 DataConnection protocol config encrypted at rest (migration
20260909203046_EnforceGlobalInstanceNamesAndProtectProtocolConfiguration — coordinated
central upgrade, old binaries cannot read protected rows); DL-3 bounded Replay paging;
DL-6 cross-site Overwrite of a deployed instance rejected; XC-4 proto descriptor contract test.

Config/hygiene: XC-1 central listener isolation by local port; XC-2/XC-3 inert SMTP + cron
keys removed from rig settings; CM-2 env2 bootstrap guard enabled; DC-6 deploy site exit code;
DC-7 notifier retries only explicit standby rejection; XC-5 ClusterClient purged from docs.

Gates recorded in the report: build 0/0, 9 397 passed / 0 failed, rig redeployed on all
eight nodes with the migration applied. 46 Low findings remain open.

src/ZB.MOM.WW.ScadaBridge.CLI/Commands/DeployCommands.cs

@@ -1,5 +1,6 @@
 using System.CommandLine;
 using System.CommandLine.Parsing;
+using System.Text.Json;
 using ZB.MOM.WW.ScadaBridge.Commons.Messages.Management;
 
 namespace ZB.MOM.WW.ScadaBridge.CLI.Commands;
@@ -77,16 +78,31 @@ public static class DeployCommands
                 // A bulk deploy is N instance round-trips; the default 30 s client
                 // timeout would abandon the request while the server is still
                 // applying. Matches the server-side long-running Ask window.
-                timeout: BulkDeployTimeout);
+                timeout: BulkDeployTimeout,
+                onSuccess: json => HandleSiteDeploymentResponse(json, CommandHelpers.ResolveFormat(result, formatOption, CliConfig.Load())));
         });
         return cmd;
     }
 
     /// <summary>
-    /// Client-side timeout for the bulk site deploy, matching the management
-    /// service's long-running command Ask window.
+    /// The server owns the bounded overall bulk deadline; do not abandon it with a shorter client timer.
     /// </summary>
-    internal static readonly TimeSpan BulkDeployTimeout = TimeSpan.FromMinutes(5);
+    internal static readonly TimeSpan BulkDeployTimeout = Timeout.InfiniteTimeSpan;
+
+    internal static int HandleSiteDeploymentResponse(string json, string format)
+    {
+        CommandHelpers.HandleResponse(new ManagementResponse(200, json, null, null), format);
+        try
+        {
+            using var payload = JsonDocument.Parse(json);
+            if (payload.RootElement.TryGetProperty("failureCount", out var failures)
+                && failures.TryGetInt32(out var count) && count >= 0)
+                return count == 0 ? 0 : 1;
+        }
+        catch (JsonException) { }
+        OutputFormatter.WriteError("The server returned an invalid site deployment summary.", "INVALID_RESPONSE");
+        return 1;
+    }
 
     private static Command BuildArtifacts(Option<string> urlOption, Option<string> formatOption, Option<string> usernameOption, Option<string> passwordOption)
     {