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/AuditQueryHelpers.cs

@@ -61,6 +61,7 @@ public static class AuditQueryHelpers
     /// <param name="spec">The time specification string.</param>
     /// <param name="now">The current time used as reference for relative specs.</param>
     /// <exception cref="FormatException">The spec is neither a known relative form nor a parseable ISO-8601 timestamp.</exception>
+    /// <returns>The resolved absolute <see cref="DateTimeOffset"/> in UTC.</returns>
     public static DateTimeOffset ResolveTimeSpec(string spec, DateTimeOffset now)
     {
         if (string.IsNullOrWhiteSpace(spec))
@@ -103,6 +104,7 @@ public static class AuditQueryHelpers
     /// <param name="now">The current time for resolving relative time specs.</param>
     /// <param name="afterOccurredAtUtc">Optional keyset cursor timestamp.</param>
     /// <param name="afterEventId">Optional keyset cursor event ID.</param>
+    /// <returns>A URL query string (starting with <c>?</c>) containing the encoded filter parameters, or an empty string if no parameters are set.</returns>
     public static string BuildQueryString(
         AuditQueryArgs args, DateTimeOffset now, DateTimeOffset? afterOccurredAtUtc, string? afterEventId)
     {
@@ -169,6 +171,7 @@ public static class AuditQueryHelpers
     /// <param name="formatter">The audit result formatter.</param>
     /// <param name="output">The output writer for results.</param>
     /// <param name="now">The current time for resolving relative time specs.</param>
+    /// <returns>A task that resolves to <c>0</c> on success, <c>1</c> on HTTP/transport error, or <c>2</c> on authorization failure.</returns>
     public static async Task<int> RunQueryAsync(
         ManagementHttpClient client,
         AuditQueryArgs args,