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.Commons/Interfaces/Services/ISandboxDatabaseConnectionSource.cs

@@ -2,5 +2,9 @@ namespace ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Services;
 /// <summary>Private worker handoff for an existing configured SQL connection. Never log or expose the returned secret.</summary>
 public interface ISandboxDatabaseConnectionSource
 {
+    /// <summary>Resolves the connection string for a configured connection.</summary>
+    /// <param name="connectionName">The configured database connection name.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>The connection string; a secret that must never be logged or exposed.</returns>
     Task<string> GetSandboxConnectionStringAsync(string connectionName, CancellationToken cancellationToken);
 }