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.TemplateEngine/CycleDetector.cs

@@ -17,6 +17,7 @@ public static class CycleDetector
     /// A plain <c>ToDictionary(t =&gt; t.Id)</c> would instead throw ArgumentException.
     /// </summary>
     /// <param name="allTemplates">All templates to build lookup from.</param>
+    /// <returns>A dictionary keyed by template Id; on duplicate Ids the first occurrence wins.</returns>
     internal static Dictionary<int, Template> BuildLookup(IReadOnlyList<Template> allTemplates)
     {
         var lookup = new Dictionary<int, Template>();