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.ExternalSystemGateway/ServiceCollectionExtensions.cs

@@ -25,7 +25,7 @@ public static class ServiceCollectionExtensions
 
         services.AddHttpClient();
 
-        // ExternalSystemGateway-013 / -016: wire MaxConcurrentConnectionsPerSystem
+        // Wire MaxConcurrentConnectionsPerSystem
         // into the primary handler of the gateway's per-system named clients
         // ("ExternalSystem_{name}") only. The names are created dynamically, so a
         // static AddHttpClient("name") registration is not possible; instead a
@@ -53,13 +53,13 @@ public static class ServiceCollectionExtensions
     /// <returns>The same <see cref="IServiceCollection"/> for chaining.</returns>
     public static IServiceCollection AddExternalSystemGatewayActors(this IServiceCollection services)
     {
-        // WP-10: Actor registration happens in AkkaHostedService.
+        // Actor registration happens in AkkaHostedService.
         // Script Execution Actors run on dedicated blocking I/O dispatcher.
         return services;
     }
 
     /// <summary>
-    /// ExternalSystemGateway-016: configures the primary HTTP message handler with the
+    /// Configures the primary HTTP message handler with the
     /// gateway's <see cref="ExternalSystemGatewayOptions.MaxConcurrentConnectionsPerSystem"/>
     /// cap, but only for the gateway's own named clients
     /// (<see cref="GatewayClientNamePrefix"/>). Clients owned by other host components