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.

src/Core/ZB.MOM.WW.OtOpcUa.Core.ScriptedAlarms/MessageTemplate.cs

@@ -43,6 +43,9 @@ public static class MessageTemplate
     ///     "Input-quality policy" section in <c>docs/ScriptedAlarms.md</c>.
     ///     (Core.ScriptedAlarms-010)
     /// </remarks>
+    /// <param name="template">The template string with {path} tokens.</param>
+    /// <param name="resolveTag">A function to resolve tag values by path.</param>
+    /// <returns>The resolved template string with tokens replaced or marked as unresolvable.</returns>
     public static string Resolve(string template, Func<string, DataValueSnapshot?> resolveTag)
     {
         if (string.IsNullOrEmpty(template)) return template ?? string.Empty;
@@ -60,6 +63,8 @@ public static class MessageTemplate
     }
 
     /// <summary>Enumerate the token paths the template references. Used at publish time to validate references exist.</summary>
+    /// <param name="template">The template string to extract tokens from.</param>
+    /// <returns>A list of all token paths found in the template.</returns>
     public static IReadOnlyList<string> ExtractTokenPaths(string? template)
     {
         if (string.IsNullOrEmpty(template)) return Array.Empty<string>();