docs(comments): strip internal task/milestone/bundle bookkeeping from code comments

Remove project bookkeeping citations from shipped code comments across the
solution: hyphenated task IDs (WP-14, StoreAndForward-025), milestone/task/
issue refs (M3, Task 4, Audit Log #23, #21), Bundle X task-bundle labels,
and C/D/K/S/T phase labels.

Comment text only — no code logic, string/log literals, or XML-doc structure
changed. Genuine descriptions are preserved (only the citation is stripped),
and technical lookalikes are retained (UTF-8, SHA-256, T00:00:00, M365,
UTC-5, pre-C4/pre-C5 schema versions). Flagged by the new CommentChecker
TaskReferenceInComment / TrackingReferenceInComment checks plus targeted
grep passes; full solution builds clean, append-only guard tests pass.

src/ZB.MOM.WW.ScadaBridge.NotificationService/SmtpErrorClassifier.cs

@@ -5,7 +5,7 @@ using MailKit.Net.Smtp;
 namespace ZB.MOM.WW.ScadaBridge.NotificationService;
 
 /// <summary>
-/// NS-002/NS-003: The classification of an SMTP delivery failure. This decides
+/// The classification of an SMTP delivery failure. This decides
 /// whether a failure is retried or surfaced to the caller, so it is part of the
 /// system's correctness-relevant behaviour.
 /// </summary>
@@ -22,12 +22,12 @@ public enum SmtpErrorClass
 }
 
 /// <summary>
-/// NS-002/NS-003: Classifies an SMTP failure using MailKit's typed exceptions and
+/// Classifies an SMTP failure using MailKit's typed exceptions and
 /// the numeric <see cref="SmtpStatusCode"/> rather than locale-dependent substring
 /// matching on the exception message.
 /// <para>
 /// Public and shared: the central Notification Outbox's <c>EmailNotificationDeliveryAdapter</c>
-/// routes every SMTP failure through this single policy. (NS-019: the orphaned site-side
+/// routes every SMTP failure through this single policy. (The orphaned site-side
 /// <c>NotificationDeliveryService</c> that previously co-used this classifier was removed
 /// when sites stopped delivering notifications.)
 /// </para>