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/SecurityCommands.cs

@@ -13,6 +13,7 @@ public static class SecurityCommands
     /// <param name="formatOption">Shared output format option.</param>
     /// <param name="usernameOption">Shared username option for authentication.</param>
     /// <param name="passwordOption">Shared password option for authentication.</param>
+    /// <returns>The configured <c>security</c> command with all subcommands attached.</returns>
     public static Command Build(Option<string> urlOption, Option<string> formatOption, Option<string> usernameOption, Option<string> passwordOption)
     {
         var command = new Command("security") { Description = "Manage security settings" };
@@ -125,6 +126,7 @@ public static class SecurityCommands
     /// The advisory line is written to stderr so that piping stdout captures only the token.
     /// </summary>
     /// <param name="json">The JSON success body returned by the management API.</param>
+    /// <returns>Exit code 0.</returns>
     internal static int PrintCreatedKey(string json)
     {
         using var doc = System.Text.Json.JsonDocument.Parse(json);