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.Configuration.Tests/SchemaComplianceTests.cs

@@ -16,8 +16,11 @@ public sealed class SchemaComplianceTests
 {
     private readonly SchemaComplianceFixture _fixture;
 
+    /// <summary>Initializes a new instance of the <see cref="SchemaComplianceTests"/> class.</summary>
+    /// <param name="fixture">The database schema compliance fixture.</param>
     public SchemaComplianceTests(SchemaComplianceFixture fixture) => _fixture = fixture;
 
+    /// <summary>Verifies that all expected tables exist in the schema.</summary>
     [Fact]
     public void All_expected_tables_exist()
     {
@@ -47,6 +50,7 @@ SELECT name FROM sys.tables WHERE name <> '__EFMigrationsHistory' ORDER BY name;
         actual.Count.ShouldBe(expected.Length);
     }
 
+    /// <summary>Verifies that filtered unique indexes match the schema specification.</summary>
     [Fact]
     public void Filtered_unique_indexes_match_schema_spec()
     {
@@ -73,6 +77,7 @@ WHERE  i.is_unique = 1 AND i.has_filter = 1;",
         }
     }
 
+    /// <summary>Verifies that check constraints match the schema specification.</summary>
     [Fact]
     public void Check_constraints_match_schema_spec()
     {
@@ -94,6 +99,7 @@ WHERE  i.is_unique = 1 AND i.has_filter = 1;",
             actual.ShouldContain(ck, $"missing CHECK constraint: {ck}");
     }
 
+    /// <summary>Verifies that JSON check constraints use the ISJSON function.</summary>
     [Fact]
     public void Json_check_constraints_use_IsJson_function()
     {
@@ -110,6 +116,7 @@ WHERE  cc.name LIKE 'CK_%_IsJson';",
                 $"{name} definition does not call ISJSON: {definition}");
     }
 
+    /// <summary>Verifies that the Deployment Status column exists.</summary>
     [Fact]
     public void Deployment_Status_column_exists()
     {
@@ -125,6 +132,7 @@ WHERE  c.TABLE_NAME = 'Deployment' AND c.COLUMN_NAME = 'Status';",
         rows.Count.ShouldBe(1);
     }
 
+    /// <summary>Verifies that Equipment carries OPC 4.0 10 identity fields.</summary>
     [Fact]
     public void Equipment_carries_Opc40010_identity_fields()
     {
@@ -140,6 +148,7 @@ SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'Equipment
             columns.ShouldContain(col, $"Equipment missing expected column: {col}");
     }
 
+    /// <summary>Verifies that Namespace has at least one unique index.</summary>
     [Fact]
     public void Namespace_has_some_unique_index()
     {