docs(src): add missing XML docs and strip tracking-ID comments

Sweep of 203 source files resolving CommentChecker findings: add
<summary>/<param>/<returns>/<inheritdoc> where missing, and remove
resolved task/issue tracking markers (Tests-NNN, Worker-NNN, Server-NNN,
Task N) from code comments. Comment/doc-only — no logic changes.
Server+Tests build clean under TreatWarningsAsErrors.

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

@@ -24,6 +24,7 @@ public static class AlarmRecordTransitionMapper
     ///     <see cref="MxAlarmStateKind.Unspecified"/>.
     /// </summary>
     /// <param name="stateXml">The state XML string from AVEVA (e.g., UNACK_ALM, ACK_RTN).</param>
+    /// <returns>The parsed <see cref="MxAlarmStateKind"/>, or <see cref="MxAlarmStateKind.Unspecified"/> when unrecognized.</returns>
     public static MxAlarmStateKind ParseStateKind(string? stateXml)
     {
         if (string.IsNullOrWhiteSpace(stateXml)) return MxAlarmStateKind.Unspecified;
@@ -51,6 +52,7 @@ public static class AlarmRecordTransitionMapper
     /// </summary>
     /// <param name="previous">The previous alarm state kind.</param>
     /// <param name="current">The current alarm state kind.</param>
+    /// <returns>The proto <see cref="AlarmTransitionKind"/> that the state change represents.</returns>
     public static AlarmTransitionKind MapTransition(
         MxAlarmStateKind previous,
         MxAlarmStateKind current)
@@ -87,6 +89,7 @@ public static class AlarmRecordTransitionMapper
     /// <param name="providerName">The provider name, or null.</param>
     /// <param name="groupName">The group name, or null.</param>
     /// <param name="alarmName">The alarm name, or null.</param>
+    /// <returns>The composed <c>Provider!Group.AlarmName</c> reference string.</returns>
     public static string ComposeFullReference(string? providerName, string? groupName, string? alarmName)
     {
         string provider = providerName ?? string.Empty;
@@ -113,6 +116,7 @@ public static class AlarmRecordTransitionMapper
     /// <param name="xmlTime">e.g. <c>"13:26:14.709"</c>.</param>
     /// <param name="gmtOffsetMinutes">Offset of the producer's local time vs UTC, in minutes.</param>
     /// <param name="dstAdjustMinutes">DST adjustment already applied to local time, in minutes.</param>
+    /// <returns>The reassembled UTC timestamp, or <see cref="DateTime.MinValue"/> when parsing fails.</returns>
     public static DateTime ParseTransitionTimestampUtc(
         string? xmlDate,
         string? xmlTime,
@@ -181,7 +185,7 @@ public static class AlarmRecordTransitionMapper
 
         // GMTOFFSET = minutes east of UTC (or behind, depending on convention).
         // The wnwrap convention observed: GMTOFFSET=240, DSTADJUST=0 for
-        // EDT (UTC-4) — so the field is "minutes from local to UTC". To get
+        // EDT (4 hours behind UTC) — so the field is "minutes from local to UTC". To get
         // UTC, ADD the offset.
         DateTime utc = localProducerTime.AddMinutes(gmtOffsetMinutes - dstAdjustMinutes);
         return DateTime.SpecifyKind(utc, DateTimeKind.Utc);