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/Core/ZB.MOM.WW.OtOpcUa.Core.Tests/Stability/ScheduledRecycleSchedulerTests.cs

@@ -12,6 +12,8 @@ public sealed class ScheduledRecycleSchedulerTests
     private static readonly DateTime T0 = new(2026, 4, 19, 0, 0, 0, DateTimeKind.Utc);
     private static readonly TimeSpan Weekly = TimeSpan.FromDays(7);
 
+    /// <summary>Verifies constructor throws for Tier A or B.</summary>
+    /// <param name="tier">The driver tier to test.</param>
     [Theory]
     [InlineData(DriverTier.A)]
     [InlineData(DriverTier.B)]
@@ -22,6 +24,7 @@ public sealed class ScheduledRecycleSchedulerTests
             tier, Weekly, T0, supervisor, NullLogger<ScheduledRecycleScheduler>.Instance));
     }
 
+    /// <summary>Verifies constructor throws for zero or negative intervals.</summary>
     [Fact]
     public void ZeroOrNegativeInterval_Throws()
     {
@@ -32,6 +35,7 @@ public sealed class ScheduledRecycleSchedulerTests
             DriverTier.C, TimeSpan.FromSeconds(-1), T0, supervisor, NullLogger<ScheduledRecycleScheduler>.Instance));
     }
 
+    /// <summary>Verifies Tick before the next recycle time is a no-op.</summary>
     [Fact]
     public async Task Tick_BeforeNextRecycle_NoOp()
     {
@@ -44,6 +48,7 @@ public sealed class ScheduledRecycleSchedulerTests
         supervisor.RecycleCount.ShouldBe(0);
     }
 
+    /// <summary>Verifies Tick at or after the next recycle time fires once and advances.</summary>
     [Fact]
     public async Task Tick_AtOrAfterNextRecycle_FiresOnce_AndAdvances()
     {
@@ -57,6 +62,7 @@ public sealed class ScheduledRecycleSchedulerTests
         sch.NextRecycleUtc.ShouldBe(T0 + Weekly + Weekly);
     }
 
+    /// <summary>Verifies RequestRecycleNow fires immediately without advancing the schedule.</summary>
     [Fact]
     public async Task RequestRecycleNow_Fires_Immediately_WithoutAdvancingSchedule()
     {
@@ -71,6 +77,7 @@ public sealed class ScheduledRecycleSchedulerTests
         sch.NextRecycleUtc.ShouldBe(nextBefore, "ad-hoc recycle doesn't shift the cron schedule");
     }
 
+    /// <summary>Verifies multiple ticks across the recycle interval each advance by one interval.</summary>
     [Fact]
     public async Task MultipleFires_AcrossTicks_AdvanceOneIntervalEach()
     {
@@ -85,12 +92,22 @@ public sealed class ScheduledRecycleSchedulerTests
         sch.NextRecycleUtc.ShouldBe(T0 + TimeSpan.FromDays(4));
     }
 
+    /// <summary>Fake driver supervisor for testing.</summary>
     private sealed class FakeSupervisor : IDriverSupervisor
     {
+        /// <summary>Gets the driver instance ID.</summary>
         public string DriverInstanceId => "tier-c-fake";
+
+        /// <summary>Gets the number of times RecycleAsync was called.</summary>
         public int RecycleCount { get; private set; }
+
+        /// <summary>Gets the reason from the most recent recycle call.</summary>
         public string? LastReason { get; private set; }
 
+        /// <summary>Simulates a driver recycle operation.</summary>
+        /// <param name="reason">The reason for the recycle.</param>
+        /// <param name="cancellationToken">Cancellation token.</param>
+        /// <returns>A completed task.</returns>
         public Task RecycleAsync(string reason, CancellationToken cancellationToken)
         {
             RecycleCount++;