docs: backfill XML documentation across 756 files

Adds <summary>, <param>, <typeparam>, and <inheritdoc/> tags to public
members surfaced by commentchecker — resolves 5,847 of 5,869 issues
(99.6%) across three /fixdocs passes.

tests/Server/ZB.MOM.WW.OtOpcUa.Runtime.Tests/ScriptedAlarms/ScriptedAlarmStatePersistenceTests.cs

@@ -12,6 +12,7 @@ namespace ZB.MOM.WW.OtOpcUa.Runtime.Tests.ScriptedAlarms;
 
 public sealed class ScriptedAlarmStatePersistenceTests : RuntimeActorTestBase
 {
+    /// <summary>Verifies that alarm state transitions write to the state store with the correct lastAckUser value.</summary>
     [Fact]
     public async Task Transition_writes_to_state_store_with_lastAckUser()
     {
@@ -37,6 +38,7 @@ public sealed class ScriptedAlarmStatePersistenceTests : RuntimeActorTestBase
         }, duration: TimeSpan.FromSeconds(2));
     }
 
+    /// <summary>Verifies that actor restart restores persisted state so pending acknowledgment is not dropped.</summary>
     [Fact]
     public async Task PreStart_restores_persisted_state_so_restart_does_not_drop_pending_ack()
     {
@@ -61,6 +63,7 @@ public sealed class ScriptedAlarmStatePersistenceTests : RuntimeActorTestBase
         }, duration: TimeSpan.FromSeconds(3));
     }
 
+    /// <summary>Verifies that alarm boots to inactive state when no persisted state exists.</summary>
     [Fact]
     public async Task PreStart_with_no_persisted_state_boots_inactive()
     {
@@ -76,6 +79,7 @@ public sealed class ScriptedAlarmStatePersistenceTests : RuntimeActorTestBase
         parent.ExpectNoMsg(TimeSpan.FromMilliseconds(300));
     }
 
+    /// <summary>Verifies that EF-based alarm actor state store correctly persists and restores state through the config database.</summary>
     [Fact]
     public async Task EfAlarmActorStateStore_round_trip_persists_via_ConfigDb()
     {
@@ -113,6 +117,7 @@ public sealed class ScriptedAlarmStatePersistenceTests : RuntimeActorTestBase
         }
     }
 
+    /// <summary>Verifies that loading an alarm state for a missing ID returns null.</summary>
     [Fact]
     public async Task EfAlarmActorStateStore_load_for_missing_id_returns_null()
     {
@@ -128,11 +133,20 @@ public sealed class ScriptedAlarmStatePersistenceTests : RuntimeActorTestBase
         private readonly ConcurrentDictionary<string, AlarmActorStateSnapshot> _byId = new(StringComparer.Ordinal);
         private readonly ConcurrentQueue<AlarmActorStateSnapshot> _saves = new();
 
+        /// <summary>Gets all saved alarm state snapshots in order.</summary>
         public List<AlarmActorStateSnapshot> Snapshots => _saves.ToList();
 
+        /// <summary>Loads the alarm state snapshot for the specified alarm ID.</summary>
+        /// <param name="alarmId">The alarm ID.</param>
+        /// <param name="ct">The cancellation token.</param>
+        /// <returns>The alarm state snapshot if found, null otherwise.</returns>
         public Task<AlarmActorStateSnapshot?> LoadAsync(string alarmId, CancellationToken ct)
             => Task.FromResult(_byId.TryGetValue(alarmId, out var v) ? v : null);
 
+        /// <summary>Saves the alarm state snapshot.</summary>
+        /// <param name="snapshot">The alarm state snapshot to save.</param>
+        /// <param name="ct">The cancellation token.</param>
+        /// <returns>A completed task.</returns>
         public Task SaveAsync(AlarmActorStateSnapshot snapshot, CancellationToken ct)
         {
             _byId[snapshot.AlarmId] = snapshot;