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.KpiHistory/KpiSourceAdmission.cs

@@ -12,6 +12,13 @@ internal sealed class KpiSourceAdmission
     private readonly object _gate = new();
     private readonly Dictionary<int, Task<IReadOnlyList<KpiSample>>> _tasks = new();
 
+    /// <summary>
+    /// Starts a collection for the given registration unless an earlier one is still running, in which case the running one is returned.
+    /// </summary>
+    /// <param name="registrationIndex">Stable index of the source registration.</param>
+    /// <param name="collect">Delegate that performs the collection when a new one is started.</param>
+    /// <param name="collection">The new collection task, or the still-running earlier one.</param>
+    /// <returns><see langword="true"/> if a new collection was started; <see langword="false"/> if an earlier one is still running.</returns>
     internal bool TryStart(
         int registrationIndex,
         Func<Task<IReadOnlyList<KpiSample>>> collect,