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.OpcUaClient.Tests/OpcUaClientNamespaceTests.cs

@@ -14,6 +14,7 @@ public sealed class OpcUaClientNamespaceTests
 {
     // ---- Driver.OpcUaClient-004: TargetNamespaceKind startup enforcement ----
 
+    /// <summary>Verifies that Equipment namespace kind without mapping table is rejected.</summary>
     [Fact]
     public void ValidateNamespaceKind_Equipment_without_mapping_table_is_rejected()
     {
@@ -24,6 +25,7 @@ public sealed class OpcUaClientNamespaceTests
             .Message.ShouldContain("UnsMappingTable");
     }
 
+    /// <summary>Verifies that Equipment namespace kind with mapping table passes.</summary>
     [Fact]
     public void ValidateNamespaceKind_Equipment_with_mapping_table_passes()
     {
@@ -35,6 +37,7 @@ public sealed class OpcUaClientNamespaceTests
         Should.NotThrow(() => OpcUaClientDriver.ValidateNamespaceKind(opts));
     }
 
+    /// <summary>Verifies that SystemPlatform namespace kind with mapping table is rejected.</summary>
     [Fact]
     public void ValidateNamespaceKind_SystemPlatform_with_mapping_table_is_rejected()
     {
@@ -48,6 +51,7 @@ public sealed class OpcUaClientNamespaceTests
             .Message.ShouldContain("SystemPlatform");
     }
 
+    /// <summary>Verifies that SystemPlatform namespace kind without mapping table passes.</summary>
     [Fact]
     public void ValidateNamespaceKind_SystemPlatform_without_mapping_table_passes()
     {
@@ -55,6 +59,7 @@ public sealed class OpcUaClientNamespaceTests
         Should.NotThrow(() => OpcUaClientDriver.ValidateNamespaceKind(opts));
     }
 
+    /// <summary>Verifies that the default target namespace kind is Equipment.</summary>
     [Fact]
     public void Default_TargetNamespaceKind_is_Equipment()
     {
@@ -64,10 +69,12 @@ public sealed class OpcUaClientNamespaceTests
 
     // ---- Driver.OpcUaClient-004: server-stable NodeId encoding ----
 
+    /// <summary>Verifies that NamespaceMap.FromSession rejects null session.</summary>
     [Fact]
     public void NamespaceMap_FromSession_rejects_null_session() =>
         Should.Throw<ArgumentNullException>(() => NamespaceMap.FromSession(null!));
 
+    /// <summary>Verifies that namespace 0 NodeId keeps compact form.</summary>
     [Fact]
     public void NamespaceMap_namespace0_NodeId_keeps_compact_form()
     {
@@ -79,6 +86,7 @@ public sealed class OpcUaClientNamespaceTests
         map.ToStableReference(coreNode).ShouldNotContain("nsu=");
     }
 
+    /// <summary>Verifies that nonzero namespace NodeId is encoded with URI, not index.</summary>
     [Fact]
     public void NamespaceMap_nonzero_namespace_NodeId_is_encoded_with_uri_not_index()
     {
@@ -92,6 +100,7 @@ public sealed class OpcUaClientNamespaceTests
         stable.ShouldNotStartWith("ns=1");
     }
 
+    /// <summary>Verifies that unknown namespace index falls back to raw form.</summary>
     [Fact]
     public void NamespaceMap_unknown_namespace_index_falls_back_to_raw_form()
     {
@@ -102,6 +111,7 @@ public sealed class OpcUaClientNamespaceTests
         Should.NotThrow(() => map.ToStableReference(node));
     }
 
+    /// <summary>Verifies that namespace index and URI lookups are bidirectional.</summary>
     [Fact]
     public void NamespaceMap_index_and_uri_lookups_are_bidirectional()
     {
@@ -113,6 +123,7 @@ public sealed class OpcUaClientNamespaceTests
         map.UriForIndex(99).ShouldBeNull();
     }
 
+    /// <summary>Verifies that NamespaceMap.TryResolve rejects empty and null input.</summary>
     [Fact]
     public void NamespaceMap_TryResolve_rejects_empty_and_null_input()
     {