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/CommandHelpers.cs

@@ -30,6 +30,7 @@ internal static class CommandHelpers
     /// (<see cref="IsAuthorizationFailure"/>) is preserved on the error path either way,
     /// closing CLI-017's regression.
     /// </param>
+    /// <returns>A task that resolves to the process exit code (0 = success, 1 = error, 2 = authorization failure).</returns>
     internal static async Task<int> ExecuteCommandAsync(
         ParseResult result,
         Option<string> urlOption,
@@ -110,6 +111,7 @@ internal static class CommandHelpers
     /// <param name="result">Parsed command-line result.</param>
     /// <param name="formatOption">The <c>--format</c> option definition.</param>
     /// <param name="config">Loaded CLI configuration providing the default format fallback.</param>
+    /// <returns>The resolved format string (e.g. <c>"json"</c> or <c>"table"</c>).</returns>
     internal static string ResolveFormat(ParseResult result, Option<string> formatOption, CliConfig config)
     {
         // GetResult returns non-null only when the option was actually present on the
@@ -130,6 +132,7 @@ internal static class CommandHelpers
     /// </summary>
     /// <param name="commandLineValue">Value supplied on the command line, or null if absent.</param>
     /// <param name="envValue">Fallback value from the config file or environment variable.</param>
+    /// <returns>The command-line value when non-empty; otherwise the environment fallback (may be null).</returns>
     internal static string? ResolveCredential(string? commandLineValue, string? envValue)
         => string.IsNullOrWhiteSpace(commandLineValue) ? envValue : commandLineValue;
 
@@ -140,6 +143,7 @@ internal static class CommandHelpers
     /// an unhandled <see cref="UriFormatException"/>.
     /// </summary>
     /// <param name="url">URL string to validate.</param>
+    /// <returns><c>true</c> when the URL is an absolute http or https URL; otherwise <c>false</c>.</returns>
     internal static bool IsValidManagementUrl(string? url)
     {
         if (string.IsNullOrWhiteSpace(url))
@@ -154,6 +158,7 @@ internal static class CommandHelpers
     /// </summary>
     /// <param name="response">Response received from the management API.</param>
     /// <param name="format">Output format (<c>json</c> or <c>table</c>).</param>
+    /// <returns>The process exit code (0 = success, 1 = error, 2 = authorization failure).</returns>
     internal static int HandleResponse(ManagementResponse response, string format)
     {
         if (response.JsonData != null)
@@ -192,6 +197,8 @@ internal static class CommandHelpers
     /// both channels are honoured. (Authentication failure — HTTP 401 / bad credentials
     /// — is deliberately <em>not</em> treated as authorization failure; it is exit 1.)
     /// </summary>
+    /// <param name="response">The management response to inspect for authorization failure signals.</param>
+    /// <returns><c>true</c> when the response signals an authorization failure (HTTP 403 or FORBIDDEN/UNAUTHORIZED code).</returns>
     internal static bool IsAuthorizationFailure(ManagementResponse response)
     {
         if (response.StatusCode == 403)