docs: complete XML doc coverage (returns, summaries, inheritdoc)

Resolve all 622 issues flagged by the enhanced CommentChecker: add missing
<returns> tags (incl. the standard phrasing on non-generic Task methods),
add missing <summary> tags, and replace misused/redundant <inheritdoc/> on
members that override or implement nothing with real documentation.
Documentation-only — no behavior change; solution builds clean.

src/ZB.MOM.WW.ScadaBridge.CLI/Commands/AuditLogCommands.cs

@@ -50,6 +50,7 @@ public static class AuditLogCommands
     /// <param name="formatOption">Global output format option.</param>
     /// <param name="usernameOption">Global username option.</param>
     /// <param name="passwordOption">Global password option.</param>
+    /// <returns>The configured <c>audit-config</c> command with all sub-commands registered.</returns>
     public static Command Build(Option<string> urlOption, Option<string> formatOption, Option<string> usernameOption, Option<string> passwordOption)
     {
         var command = new Command("audit-config") { Description = "Query the configuration-change audit log" };