docs(src): fix CommentChecker findings across src/ — 1,032 → 5 (all false positives)

Comment/XML-doc changes only, no code logic:
- strip project-tracking references (WP*, P*-*, row-NN, #NN, Task N) from
  comments, keeping the explanatory rationale
- add missing summaries, <param>, <returns>, <typeparam> and <inheritdoc/>
- replace misused <inheritdoc/> with real docs; where <inheritdoc/> was
  combined with useful remarks, move the rationale into // comments
- drop stale replicationActor <param> on DeploymentManagerActor ctor

Remaining 5 are false positives (CWE-1236 x2, failures-1, year-0001, M365).
Build 0 errors / 0 warnings.

src/ZB.MOM.WW.ScadaBridge.ExternalSystemGateway/ExternalSystemClient.cs

@@ -29,7 +29,7 @@ public class ExternalSystemClient : IExternalSystemClient
 
     /// <summary>
     /// Shared options for the per-call AuthConfiguration JSON parse in
-    /// <see cref="TryParseJsonAuth"/> (perf remediation, arch-review WP1.5) — avoids
+    /// <see cref="TryParseJsonAuth"/> — avoids
     /// allocating a new <see cref="JsonSerializerOptions"/> (and its internal cached
     /// metadata) on every outbound call. Settings preserved exactly.
     /// </summary>