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/OpcUaClientSecurityPolicyTests.cs

@@ -7,6 +7,8 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient.Tests;
 [Trait("Category", "Unit")]
 public sealed class OpcUaClientSecurityPolicyTests
 {
+    /// <summary>Verifies that every security policy enum value maps to a known non-empty URI.</summary>
+    /// <param name="policy">The OPC UA security policy to map.</param>
     [Theory]
     [InlineData(OpcUaSecurityPolicy.None)]
     [InlineData(OpcUaSecurityPolicy.Basic128Rsa15)]
@@ -24,6 +26,7 @@ public sealed class OpcUaClientSecurityPolicyTests
             uri.ShouldContain(policy.ToString());
     }
 
+    /// <summary>Verifies that None security policy maps to the SDK None URI.</summary>
     [Fact]
     public void MapSecurityPolicy_None_matches_SDK_None_URI()
     {
@@ -31,6 +34,7 @@ public sealed class OpcUaClientSecurityPolicyTests
             .ShouldBe(SecurityPolicies.None);
     }
 
+    /// <summary>Verifies that Basic256Sha256 policy maps to the SDK URI.</summary>
     [Fact]
     public void MapSecurityPolicy_Basic256Sha256_matches_SDK_URI()
     {
@@ -38,6 +42,7 @@ public sealed class OpcUaClientSecurityPolicyTests
             .ShouldBe(SecurityPolicies.Basic256Sha256);
     }
 
+    /// <summary>Verifies that Aes256_Sha256_RsaPss policy maps to the SDK URI.</summary>
     [Fact]
     public void MapSecurityPolicy_Aes256_Sha256_RsaPss_matches_SDK_URI()
     {
@@ -45,6 +50,7 @@ public sealed class OpcUaClientSecurityPolicyTests
             .ShouldBe(SecurityPolicies.Aes256_Sha256_RsaPss);
     }
 
+    /// <summary>Verifies that every security policy enum value has a mapping.</summary>
     [Fact]
     public void Every_enum_value_has_a_mapping()
     {