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.Server/Sessions/EventSubscriberReplayAttachment.cs

@@ -4,7 +4,7 @@ namespace ZB.MOM.WW.MxGateway.Server.Sessions;
 
 /// <summary>
 ///     The result of a reconnect/resume attach
-///     (<see cref="GatewaySession.AttachEventSubscriberWithReplay"/>, Task 12): the live
+///     (<see cref="GatewaySession.AttachEventSubscriberWithReplay"/>): the live
 ///     subscriber lease plus the replay batch and resume watermarks snapshotted atomically
 ///     with the registration, so the replay→live handoff has no gap and no duplicate.
 /// </summary>