fix(alarms): fetch/poll ceilings; truncation-semantics docs; log-format conformance

src/ZB.MOM.WW.MxGateway.Worker/MxAccess/MxAccessStaSession.cs

@@ -35,6 +35,15 @@ public sealed class MxAccessStaSession : IWorkerRuntimeSession
     /// </summary>
     internal static readonly TimeSpan MinimumAlarmPollInterval = TimeSpan.FromMilliseconds(100);
 
+    /// <summary>
+    ///     Ceiling on the resolved alarm poll cadence (one hour). Mirrors the
+    ///     gateway-side MxGateway:Alarms:PollIntervalMilliseconds maximum.
+    ///     Without it, int.MaxValue milliseconds — which passed startup
+    ///     validation before this existed — silently disables alarm polling
+    ///     for ~24 days rather than reporting a misconfiguration.
+    /// </summary>
+    internal static readonly TimeSpan MaximumAlarmPollInterval = TimeSpan.FromMilliseconds(3_600_000);
+
     /// <summary>Default alarm poll cadence when the environment says nothing usable.</summary>
     internal static readonly TimeSpan DefaultAlarmPollInterval = TimeSpan.FromMilliseconds(500);
 
@@ -235,7 +244,9 @@ public sealed class MxAccessStaSession : IWorkerRuntimeSession
         }
 
         TimeSpan resolved = TimeSpan.FromMilliseconds(milliseconds);
-        return resolved < MinimumAlarmPollInterval ? DefaultAlarmPollInterval : resolved;
+        return resolved < MinimumAlarmPollInterval || resolved > MaximumAlarmPollInterval
+            ? DefaultAlarmPollInterval
+            : resolved;
     }
 
     /// <summary>