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/BundleCommands.cs

@@ -307,6 +307,13 @@ public static class BundleCommands
     // for the post-write summary line.
     internal const int Base64StreamChunkChars = 1024 * 1024; // 1 MB of base64 chars ≈ 768 KB decoded
 
+    /// <summary>
+    /// Decodes a base64 string into <paramref name="outputPath"/> in chunked fashion to avoid
+    /// large intermediate allocations. Returns the total number of decoded bytes written.
+    /// </summary>
+    /// <param name="base64">The base64-encoded content to decode and write.</param>
+    /// <param name="outputPath">Destination file path; created or overwritten.</param>
+    /// <returns>Total number of bytes written to the output file.</returns>
     internal static long StreamBase64ToFile(string base64, string outputPath)
     {
         if (base64 is null) throw new ArgumentNullException(nameof(base64));