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/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Contracts/GalaxySecretRef.cs

@@ -18,7 +18,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Config;
 ///       <item>Anything else — used as the literal API key for back-compat with
 ///         configs that pre-date this resolver. When a logger is supplied the
 ///         resolver emits a startup warning so an operator who accidentally
-///         committed a cleartext key sees it (Driver.Galaxy-010).</item>
+///         committed a cleartext key sees it.</item>
 ///     </list>
 ///     A future PR can swap any of these arms for a DPAPI-backed lookup without
 ///     changing the call site.
@@ -39,6 +39,7 @@ public static class GalaxySecretRef
     /// </summary>
     /// <param name="secretRef">The secret reference string to resolve.</param>
     /// <param name="logger">Optional logger for warning on cleartext keys.</param>
+    /// <returns>The resolved API-key string.</returns>
     public static string ResolveApiKey(string secretRef, ILogger? logger = null)
     {
         ArgumentException.ThrowIfNullOrEmpty(secretRef);