docs(xmldoc): fill missing XML docs + strip tracking-ID comments across src

Adds <summary>/<param>/<returns>/<inheritdoc> where missing and removes
project bookkeeping IDs (task/tracking refs) from shipped code comments,
so the docs read cleanly and CommentChecker is quiet except for known
false positives (PLC/protocol terms, event/IEqualityComparer inheritdoc).
Doc/comment-only; no logic changed; solution builds clean.

src/Server/ZB.MOM.WW.OtOpcUa.Security/Jwt/JwtTokenService.cs

@@ -135,6 +135,7 @@ public sealed class JwtTokenService
     /// required pairing whenever a JwtBearer scheme is wired.
     /// </para>
     /// </summary>
+    /// <returns>The <see cref="TokenValidationParameters"/> used to validate tokens minted by <see cref="Issue"/>.</returns>
     public TokenValidationParameters BuildValidationParameters() => new()
     {
         ValidateIssuer = true,