fix(worker): review 2026-10-21 stream E — cache eviction, phased ReadBulk, poll/STA fault handling

- RemoveItem/Unregister evict value + write-completion caches (leak under churn)
- ReadBulk snapshot path: add/advise all, one shared deadline, then tear down
- alarm poll faults only after 3 consecutive failures; transient ones logged
- AlarmCommandHandler disposes primary when standby build throws
- StaRuntime pumps between queued work items
- WRK-02: post-start STA loop death surfaces as StaHung WorkerFault
- WRK-09: AppDomain unhandled-exception hook, exit code 7
- RETRIGGER documented as reserved, never synthesized
- TST-05: live facts for Ping/GetSessionState/GetWorkerInfo/DrainEvents/ShutdownWorker

src/ZB.MOM.WW.MxGateway.Worker/Sta/StaMessagePump.cs

@@ -6,7 +6,7 @@ using Microsoft.Win32.SafeHandles;
 namespace ZB.MOM.WW.MxGateway.Worker.Sta;
 
 /// <summary>Pumps Windows messages on the STA thread to allow MXAccess COM events to deliver.</summary>
-public sealed class StaMessagePump
+public sealed class StaMessagePump : IStaMessagePump
 {
     private const uint Infinite = 0xFFFFFFFF;
     private const uint PmRemove = 0x0001;