docs: complete XML doc coverage (returns, summaries, inheritdoc)

Resolve all 622 issues flagged by the enhanced CommentChecker: add missing
<returns> tags (incl. the standard phrasing on non-generic Task methods),
add missing <summary> tags, and replace misused/redundant <inheritdoc/> on
members that override or implement nothing with real documentation.
Documentation-only — no behavior change; solution builds clean.

src/ZB.MOM.WW.ScadaBridge.Security/ScadaBridgeGroupRoleMapper.cs

@@ -28,7 +28,14 @@ public sealed class ScadaBridgeGroupRoleMapper : IGroupRoleMapper<string>
         _roleMapper = roleMapper ?? throw new ArgumentNullException(nameof(roleMapper));
     }
 
-    /// <inheritdoc />
+    /// <summary>
+    /// Maps a list of LDAP/AD group names to ScadaBridge roles using the wrapped
+    /// <see cref="RoleMapper"/> and returns the resulting role mapping with site-scope
+    /// information carried in the opaque <c>Scope</c> field.
+    /// </summary>
+    /// <param name="groups">The AD/LDAP group names to resolve into roles.</param>
+    /// <param name="ct">Cancellation token.</param>
+    /// <returns>A task that resolves to the group-to-role mapping including permitted site identifiers.</returns>
     public async Task<GroupRoleMapping<string>> MapAsync(IReadOnlyList<string> groups, CancellationToken ct)
     {
         var result = await _roleMapper.MapGroupsToRolesAsync(groups, ct);