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.Transport/Import/BundleImporter.cs

@@ -79,6 +79,7 @@ public sealed class BundleImporter : IBundleImporter
     /// <param name="encryptor">Handles AES-256-GCM decryption of encrypted bundles.</param>
     /// <param name="entitySerializer">Deserializes entity DTOs from bundle content.</param>
     /// <param name="sessionStore">In-memory session store for loaded bundle state.</param>
+    /// <param name="unlockRateLimiter">Rate limiter for passphrase unlock attempts per client IP.</param>
     /// <param name="options">Transport configuration options.</param>
     /// <param name="timeProvider">Abstracted time provider for testability.</param>
     /// <param name="templateRepo">Template engine repository for diff and apply.</param>