docs(xmldoc): fill missing XML docs + strip tracking-ID comments across src

Adds <summary>/<param>/<returns>/<inheritdoc> where missing and removes
project bookkeeping IDs (task/tracking refs) from shipped code comments,
so the docs read cleanly and CommentChecker is quiet except for known
false positives (PLC/protocol terms, event/IEqualityComparer inheritdoc).
Doc/comment-only; no logic changed; solution builds clean.

src/Server/ZB.MOM.WW.OtOpcUa.Runtime/ScriptedAlarms/DependencyMuxTagUpstreamSource.cs

@@ -95,13 +95,11 @@ public sealed class DependencyMuxTagUpstreamSource : ITagUpstreamSource
         return new DataValueSnapshot(Value: null, StatusCode: StatusBad, SourceTimestampUtc: null, ServerTimestampUtc: now);
     }
 
+    // No-replay contract: a new subscriber does NOT receive a synthetic initial
+    // notification for the current cached value. Callers that need the current value must
+    // call ReadTag immediately after subscribing. The engine's cold-start path
+    // (startup-recovery + read-cache-refill) already does this.
     /// <inheritdoc/>
-    /// <remarks>
-    ///     <b>No-replay contract</b>: a new subscriber does NOT receive a synthetic initial
-    ///     notification for the current cached value. Callers that need the current value must
-    ///     call <see cref="ReadTag"/> immediately after subscribing. The engine's cold-start path
-    ///     (startup-recovery + read-cache-refill) already does this.
-    /// </remarks>
     public IDisposable SubscribeTag(string path, Action<string, DataValueSnapshot> observer)
     {
         ArgumentNullException.ThrowIfNull(path);
@@ -152,6 +150,10 @@ public sealed class DependencyMuxTagUpstreamSource : ITagUpstreamSource
         private readonly string _path;
         private readonly Action<string, DataValueSnapshot> _observer;
 
+        /// <summary>Creates a handle that deregisters <paramref name="observer"/> from <paramref name="owner"/> for <paramref name="path"/> on dispose.</summary>
+        /// <param name="owner">The upstream source to deregister from.</param>
+        /// <param name="path">The tag path the observer is subscribed to.</param>
+        /// <param name="observer">The observer callback to deregister.</param>
         public Subscription(DependencyMuxTagUpstreamSource owner, string path, Action<string, DataValueSnapshot> observer)
         {
             _owner = owner;
@@ -159,6 +161,7 @@ public sealed class DependencyMuxTagUpstreamSource : ITagUpstreamSource
             _observer = observer;
         }
 
+        /// <summary>Deregisters the observer from the owning source. Idempotent — safe to call more than once.</summary>
         public void Dispose()
         {
             // Swap _owner to null first so a double-dispose can't deregister twice (the

src/Server/ZB.MOM.WW.OtOpcUa.Runtime/ScriptedAlarms/EfAlarmConditionStateStore.cs

@@ -18,7 +18,7 @@ namespace ZB.MOM.WW.OtOpcUa.Runtime.ScriptedAlarms;
 ///     <para>
 ///         <b>ActiveState is NOT persisted</b> — the entity has no Active column. On
 ///         <see cref="LoadAsync"/> it is restored as <see cref="AlarmActiveState.Inactive"/>;
-///         the engine re-derives it from the live predicate on startup (Phase 7 decision #14).
+///         the engine re-derives it from the live predicate on startup.
 ///     </para>
 ///     <para>
 ///         <b>LastTransitionUtc ↔ UpdatedAtUtc</b>: the table has no dedicated transition
@@ -74,14 +74,6 @@ public sealed class EfAlarmConditionStateStore : IAlarmStateStore
     }
 
     /// <inheritdoc />
-    /// <remarks>
-    ///     <b>Concurrency assumption</b>: saves for a given <c>alarmId</c> are serialized by the
-    ///     owning host actor (one actor owns the engine per equipment). The check-then-insert
-    ///     pattern is therefore safe under that guarantee — two concurrent inserts for the same
-    ///     alarm cannot occur in the live
-    ///     runtime. The <see cref="DbUpdateConcurrencyException"/> catch handles the edge case of a
-    ///     racing concurrent restart during crash recovery.
-    /// </remarks>
     public async Task SaveAsync(AlarmConditionState state, CancellationToken ct)
     {
         using var db = await _dbFactory.CreateDbContextAsync(ct).ConfigureAwait(false);

src/Server/ZB.MOM.WW.OtOpcUa.Runtime/ScriptedAlarms/ScriptedAlarmHostActor.cs

@@ -130,6 +130,7 @@ public sealed class ScriptedAlarmHostActor : ReceiveActor
     /// <param name="localNode">The local cluster node id, used to read this node's <see cref="RedundancyRole"/>
     /// from the <c>redundancy-state</c> topic so only the Primary publishes the cluster-wide <c>alerts</c>
     /// transition. Null (the default) leaves the role unknown ⇒ default-emit (single-node deploys + tests).</param>
+    /// <returns>The <see cref="Akka.Actor.Props"/> used to instantiate the actor.</returns>
     public static Props Props(
         IActorRef publishActor,
         IActorRef? mux,