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.

tests/ZB.MOM.WW.ScadaBridge.AuditLog.Tests/Redaction/ScadaBridgeAuditRedactorTests.cs

@@ -20,6 +20,34 @@ namespace ZB.MOM.WW.ScadaBridge.AuditLog.Tests.Redaction;
 /// </summary>
 public class ScadaBridgeAuditRedactorTests
 {
+    [Theory]
+    [InlineData(false)]
+    [InlineData(true)]
+    public void EI11_ErrorMessage_AllFieldsRedactedAndCapped(bool perTarget)
+    {
+        var opts = new AuditLogOptions { ErrorCapBytes = 128 };
+        if (perTarget) opts.PerTargetOverrides["target"] = new PerTargetRedactionOverride { AdditionalBodyRedactors = ["SECRET123"] };
+        else opts.GlobalBodyRedactors = ["SECRET123"];
+        var evt = NewEvent(status: AuditStatus.Failed, outcome: AuditOutcome.Failure, target: "target", errorDetail: "SECRET123", request: "SECRET123", response: "SECRET123", extra: "SECRET123");
+        evt = evt with { DetailsJson = AuditDetailsCodec.Serialize(Details(evt) with { ErrorMessage = "SECRET123" + new string('x', 1000) }) };
+        var result = Redactor(opts).Apply(evt);
+        Assert.DoesNotContain("SECRET123", result.DetailsJson!);
+        Assert.True(Encoding.UTF8.GetByteCount(Details(result).ErrorMessage!) <= 128);
+    }
+
+    [Fact]
+    public void EI3_SqlParameterPolicy_DoesNotPersistExceptionEchoedValues()
+    {
+        var opts = new AuditLogOptions();
+        opts.PerTargetOverrides["PrimaryDb"] = new PerTargetRedactionOverride { RedactSqlParamsMatching = "^@token$" };
+        var evt = NewEvent(channel: AuditChannel.DbOutbound, status: AuditStatus.Failed, outcome: AuditOutcome.Failure,
+            target: "PrimaryDb.Query", request: "{\"parameters\":{\"@token\":\"SECRET123\"}}", errorDetail: "SqlException duplicate key value is (SECRET123)");
+        evt = evt with { DetailsJson = AuditDetailsCodec.Serialize(Details(evt) with { ErrorMessage = "duplicate key SECRET123" }) };
+        var result = Redactor(opts).Apply(evt);
+        Assert.DoesNotContain("SECRET123", result.DetailsJson!);
+        Assert.Equal("Failed", Details(result).Status);
+    }
+
     private static ScadaBridgeAuditRedactor Redactor(
         AuditLogOptions? opts = null,
         IAuditRedactionFailureCounter? counter = null) =>