feat(focas): CNC alarms reach Part 9 conditions via ALARM: tags (#647)

An ALARM: address (*, <Type>, <Type>/<n>, <Type>/<lo>-<hi>, T<code>, OTHER) on a raw tag that
also carries the cross-driver alarm object is ONE condition with ConditionId == RawPath and a
Kind (Raise / Retrigger / Clear), so DriverHostActor.ForwardNativeAlarm routes it and
NativeAlarmProjector activates it. Fixes all seven triage defects:

1. SubscribeAlarmsAsync treated the host's RawPaths as device hosts -> nothing polled.
2. Decorated "{host}#{Type}:{Number}" ConditionId -> every event dropped.
3. No Kind -> projector kept prior state.
4. WireFocasClient.ReadAlarmsAsync answered [] on failure -> mass clear + un-acked re-raise.
   It now throws; a failed device read keeps every condition's state.
5. Acks lost on reconnect -> told-record dedup (MTConnect #626 pattern) held for the driver's
   lifetime; same-set re-subscribe / re-init re-raise nothing; changed set prunes leavers only.
6. Subscribe threw while AlarmProjection.Enabled=false -> the tag is the opt-in; flag is a no-op.
7. Alarm tags could not be authored -> ALARM: grammar (FocasAlarmSelector, Contracts) backs the
   editor, the address picker, the deploy-time inspector and driver init.

Severity: authored alarm.severity -> exact OpcUaSeverity; else the 16i-era type bucket. The type
table stays the only one (moved to Contracts, documented 16i-era; 30i codes not invented; raw
T<code> selector + raw code in every message). Read-only: ack is server-side. Also clears the
value table on a re-initialise (#630 gap that let a removed/moved tag keep reading).

E2E: Runtime.Tests FocasNativeAlarmEndToEndTests drives the real driver through the real
DriverHostActor and asserts the condition goes Active then inactive.

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

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Uns/TagEditors/FocasTagConfigModel.cs

@@ -10,7 +10,8 @@ public sealed class FocasTagConfigModel
     /// <summary>Which device (<c>FocasDeviceOptions.HostAddress</c>) this tag lives on. Optional.</summary>
     public string DeviceHostAddress { get; set; } = "";
 
-    /// <summary>Canonical FOCAS address string, e.g. <c>X0.0</c>, <c>R100</c>, <c>PARAM:1815/0</c>, <c>MACRO:500</c>. Required.</summary>
+    /// <summary>Canonical FOCAS address string, e.g. <c>X0.0</c>, <c>R100</c>, <c>PARAM:1815/0</c>, <c>MACRO:500</c>,
+    /// <c>ALARM:Servo/401</c>. Required.</summary>
     public string Address { get; set; } = "";
 
     /// <summary>FOCAS atomic data type.</summary>
@@ -98,8 +99,12 @@ public sealed class FocasTagConfigModel
     /// <param name="address">The rejected address.</param>
     /// <returns>The message.</returns>
     internal static string DescribeUnparseableAddress(string address) =>
-        $"'{address.Trim()}' is not a FOCAS address. Expected a PMC address (X0.0, R100, F20.3), " +
-        "a CNC parameter (PARAM:1020, PARAM:1815/0), a macro variable (MACRO:500), or a fixed-tree " +
-        "path (FIXED:Identity/SeriesNumber). A browse full reference including the device host is " +
-        "not an address — commit the leaf from the browser rather than pasting its id.";
+        // An ALARM: address gets its selector's own reason — the same text the deploy-time inspector gives (#647).
+        FocasAddress.DescribeAlarmAddressError(address) is { } alarmError
+            ? $"'{address.Trim()}' is not a valid FOCAS alarm address: {alarmError}."
+            : $"'{address.Trim()}' is not a FOCAS address. Expected a PMC address (X0.0, R100, F20.3), " +
+              "a CNC parameter (PARAM:1020, PARAM:1815/0), a macro variable (MACRO:500), a fixed-tree " +
+              "path (FIXED:Identity/SeriesNumber), or a CNC alarm selector (ALARM:*, ALARM:Servo/401-453, " +
+              "ALARM:OTHER). A browse full reference including the device host is " +
+              "not an address — commit the leaf from the browser rather than pasting its id.";
 }