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/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests/GalaxyDriverFactoryTests.cs

@@ -23,6 +23,7 @@ public sealed class GalaxyDriverFactoryTests
         }
         """;
 
+    /// <summary>Verifies that minimal config is parsed and defaults are applied.</summary>
     [Fact]
     public void CreateInstance_ParsesMinimalConfig_AndAppliesDefaults()
     {
@@ -40,6 +41,7 @@ public sealed class GalaxyDriverFactoryTests
         driver.Options.Reconnect.ReplayOnSessionLost.ShouldBeTrue();
     }
 
+    /// <summary>Verifies that defaults are overridden from full config.</summary>
     [Fact]
     public void CreateInstance_OverridesDefaults_FromFullConfig()
     {
@@ -77,6 +79,7 @@ public sealed class GalaxyDriverFactoryTests
         driver.Options.Reconnect.ReplayOnSessionLost.ShouldBeFalse();
     }
 
+    /// <summary>Verifies that missing endpoint throws an exception.</summary>
     [Fact]
     public void CreateInstance_MissingEndpoint_Throws()
     {
@@ -85,6 +88,7 @@ public sealed class GalaxyDriverFactoryTests
             () => GalaxyDriverFactoryExtensions.CreateInstance("g", bad)).Message.ShouldContain("Gateway.Endpoint");
     }
 
+    /// <summary>Verifies that missing API key throws an exception.</summary>
     [Fact]
     public void CreateInstance_MissingApiKey_Throws()
     {
@@ -93,6 +97,7 @@ public sealed class GalaxyDriverFactoryTests
             () => GalaxyDriverFactoryExtensions.CreateInstance("g", bad)).Message.ShouldContain("ApiKeySecretRef");
     }
 
+    /// <summary>Verifies that missing client name throws an exception.</summary>
     [Fact]
     public void CreateInstance_MissingClientName_Throws()
     {
@@ -101,6 +106,7 @@ public sealed class GalaxyDriverFactoryTests
             () => GalaxyDriverFactoryExtensions.CreateInstance("g", bad)).Message.ShouldContain("MxAccess.ClientName");
     }
 
+    /// <summary>Verifies that the factory is registered in the driver factory registry.</summary>
     [Fact]
     public void Register_AddsFactoryToRegistry()
     {
@@ -118,6 +124,7 @@ public sealed class GalaxyDriverFactoryTests
         driver.DriverType.ShouldBe(GalaxyDriverFactoryExtensions.DriverTypeName);
     }
 
+    /// <summary>Verifies that driver lifecycle toggles health state on initialize and shutdown.</summary>
     [Fact]
     public async Task DriverLifecycle_InitializeShutdown_ToggleHealth()
     {
@@ -140,6 +147,7 @@ public sealed class GalaxyDriverFactoryTests
         await driver.FlushOptionalCachesAsync(CancellationToken.None); // no-op shouldn't throw
     }
 
+    /// <summary>Verifies that reinitializing with equivalent config refreshes health.</summary>
     [Fact]
     public async Task ReinitializeAsync_RefreshesHealth_WhenConfigIsEquivalent()
     {
@@ -182,13 +190,16 @@ public sealed class GalaxyDriverFactoryTests
     /// </summary>
     private sealed class NoopSubscriber : IGalaxySubscriber
     {
+        /// <inheritdoc />
         public Task<IReadOnlyList<SubscribeResult>> SubscribeBulkAsync(
             IReadOnlyList<string> fullReferences, int bufferedUpdateIntervalMs, CancellationToken cancellationToken)
             => Task.FromResult<IReadOnlyList<SubscribeResult>>([]);
 
+        /// <inheritdoc />
         public Task UnsubscribeBulkAsync(IReadOnlyList<int> itemHandles, CancellationToken cancellationToken)
             => Task.CompletedTask;
 
+        /// <inheritdoc />
         public async IAsyncEnumerable<MxEvent> StreamEventsAsync(
             [System.Runtime.CompilerServices.EnumeratorCancellation] CancellationToken cancellationToken)
         {
@@ -197,6 +208,7 @@ public sealed class GalaxyDriverFactoryTests
         }
     }
 
+    /// <summary>Verifies that dispose is idempotent and shutdown after dispose is harmless.</summary>
     [Fact]
     public void Dispose_IsIdempotent_AndShutdownAfterDisposeIsHarmless()
     {
@@ -205,6 +217,7 @@ public sealed class GalaxyDriverFactoryTests
         Should.NotThrow(() => driver.Dispose());
     }
 
+    /// <summary>Verifies that initializing after dispose throws an exception.</summary>
     [Fact]
     public async Task InitializeAfterDispose_Throws()
     {
@@ -214,6 +227,7 @@ public sealed class GalaxyDriverFactoryTests
             driver.InitializeAsync(MinimalConfig, CancellationToken.None));
     }
 
+    /// <summary>Verifies that the driver implements all Phase 4 capabilities.</summary>
     [Fact]
     public void DriverImplementsAllPhase4Capabilities()
     {
@@ -229,6 +243,7 @@ public sealed class GalaxyDriverFactoryTests
         driver.ShouldBeAssignableTo<IHostConnectivityProbe>();
     }
 
+    /// <summary>Verifies that GetHostStatuses returns an empty snapshot after initialization with seam.</summary>
     [Fact]
     public async Task GetHostStatuses_AfterInitWithSeam_ReturnsEmptySnapshot()
     {
@@ -243,6 +258,7 @@ public sealed class GalaxyDriverFactoryTests
         driver.GetHostStatuses().ShouldBeEmpty();
     }
 
+    /// <summary>Verifies that the driver type is GalaxyMxGateway, not the legacy Galaxy type.</summary>
     [Fact]
     public void DriverType_IsGalaxyMxGateway_NotLegacyGalaxy()
     {