test+docs(mtconnect): CONDITION alarm wire test, reinit barrier, docs (#626)

MTConnectConditionAlarmWireTests drives a scripted Agent's Fault/Normal through the real
driver, NativeAlarmProjector and sink to a client event subscription on the raw device
folder. docs/drivers/MTConnect.md replaces 'CONDITION v1: plain String' with the alarm
mapping, opt-in authoring, multi-condition, ack, replay and comms-loss behaviour, and a
live-check recipe; EVENT vocabularies as enumerations marked won't-fix. AlarmTracking.md
lists the MTConnect source and the two new AlarmEventArgs fields.

Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.MTConnect.Tests/MTConnectAlarmSourceTests.cs

@@ -153,6 +153,9 @@ public sealed class MTConnectAlarmSourceTests
         await driver.SubscribeAlarmsAsync([ConditionRawPath], Ct);
         events.ShouldHaveSingleItem().Kind.ShouldBe(AlarmTransitionKind.Raise, "the subscribe re-establishes an active condition");
 
+        // The first pump must own its /sample before the restart, or the count barrier below is off by one.
+        await agent.WaitForSampleCallsAsync(1).WaitAsync(Watchdog, Ct);
+
         // A comms-loss recovery re-initializes against the same Agent, which replays the same Fault.
         await driver.ReinitializeAsync("{}", Ct);