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.Security.Tests/LdapHelperTests.cs

@@ -6,6 +6,9 @@ namespace ZB.MOM.WW.OtOpcUa.Security.Tests;
 
 public sealed class LdapHelperTests
 {
+    /// <summary>Verifies that LDAP filter special characters are properly escaped.</summary>
+    /// <param name="input">The input string.</param>
+    /// <param name="expected">The expected escaped output.</param>
     [Theory]
     [InlineData("joe", "joe")]
     [InlineData("jo*e", "jo\\2ae")]
@@ -17,6 +20,9 @@ public sealed class LdapHelperTests
         LdapAuthService.EscapeLdapFilter(input).ShouldBe(expected);
     }
 
+    /// <summary>Verifies that the first organizational unit segment is correctly extracted from a DN.</summary>
+    /// <param name="dn">The distinguished name.</param>
+    /// <param name="expected">The expected organizational unit value.</param>
     [Theory]
     [InlineData("cn=joe,ou=Admins,dc=lmxopcua,dc=local", "Admins")]
     [InlineData("cn=alice,dc=lmxopcua,dc=local", null)]
@@ -26,6 +32,9 @@ public sealed class LdapHelperTests
         LdapAuthService.ExtractOuSegment(dn).ShouldBe(expected);
     }
 
+    /// <summary>Verifies that the first RDN value is correctly extracted from various DN formats.</summary>
+    /// <param name="dn">The distinguished name.</param>
+    /// <param name="expected">The expected RDN value.</param>
     [Theory]
     [InlineData("cn=Admins,dc=lmxopcua,dc=local", "Admins")]
     [InlineData("cn=Admins", "Admins")]