docs(src): add missing XML docs and strip tracking-ID comments

Sweep of 203 source files resolving CommentChecker findings: add
<summary>/<param>/<returns>/<inheritdoc> where missing, and remove
resolved task/issue tracking markers (Tests-NNN, Worker-NNN, Server-NNN,
Task N) from code comments. Comment/doc-only — no logic changes.
Server+Tests build clean under TreatWarningsAsErrors.

src/ZB.MOM.WW.MxGateway.Worker/Bootstrap/WorkerLogRedactor.cs

@@ -28,6 +28,7 @@ public static class WorkerLogRedactor
     /// Redacts sensitive field values from a log field dictionary.
     /// </summary>
     /// <param name="fields">Dictionary of field names and values.</param>
+    /// <returns>A new dictionary with sensitive field values replaced by <see cref="RedactedValue"/>.</returns>
     public static Dictionary<string, object?> RedactFields(IReadOnlyDictionary<string, object?> fields)
     {
         Dictionary<string, object?> redactedFields = [];
@@ -45,6 +46,7 @@ public static class WorkerLogRedactor
     /// </summary>
     /// <param name="fieldName">Name of the field to check.</param>
     /// <param name="value">Value to redact if sensitive.</param>
+    /// <returns>The redacted placeholder when <paramref name="fieldName"/> looks sensitive; otherwise the original value.</returns>
     public static object? RedactValue(string fieldName, object? value)
     {
         if (value is null)