docs: add XML doc comments across src + Sister Projects section in CLAUDE.md

Bulk CommentChecker pass: fills in <param>/<inheritdoc> tags on public
APIs across all 23 src/ projects so the doc-coverage gate is green. Also
adds a Sister Projects section to CLAUDE.md pointing at the MxAccess
Gateway and OtOpcUa sibling repos, and gitignores local credential
captures (*login*.txt) and the wonder-app-vd03 deploy/ artifacts.

src/ScadaLink.CLI/Commands/AuditExportHelpers.cs

@@ -13,15 +13,45 @@ namespace ScadaLink.CLI.Commands;
 /// </summary>
 public sealed class AuditExportArgs
 {
+    /// <summary>
+    /// Start timestamp for the export time window.
+    /// </summary>
     public string Since { get; set; } = string.Empty;
+    /// <summary>
+    /// End timestamp for the export time window.
+    /// </summary>
     public string Until { get; set; } = string.Empty;
+    /// <summary>
+    /// Export format (e.g., 'json', 'csv', 'parquet').
+    /// </summary>
     public string Format { get; set; } = string.Empty;
+    /// <summary>
+    /// Output file path for the exported audit log.
+    /// </summary>
     public string Output { get; set; } = string.Empty;
+    /// <summary>
+    /// Channel filter values (repeated query parameter).
+    /// </summary>
     public string[] Channel { get; set; } = Array.Empty<string>();
+    /// <summary>
+    /// Kind filter values (repeated query parameter).
+    /// </summary>
     public string[] Kind { get; set; } = Array.Empty<string>();
+    /// <summary>
+    /// Status filter values (repeated query parameter).
+    /// </summary>
     public string[] Status { get; set; } = Array.Empty<string>();
+    /// <summary>
+    /// Site identifier filter values (repeated query parameter).
+    /// </summary>
     public string[] Site { get; set; } = Array.Empty<string>();
+    /// <summary>
+    /// Optional target system filter.
+    /// </summary>
     public string? Target { get; set; }
+    /// <summary>
+    /// Optional actor/user filter.
+    /// </summary>
     public string? Actor { get; set; }
 }
 
@@ -41,6 +71,8 @@ public static class AuditExportHelpers
     /// server's multi-value <c>IN (…)</c> filter receives the full set — mirroring
     /// <see cref="AuditQueryHelpers.BuildQueryString"/>.
     /// </summary>
+    /// <param name="args">The export arguments containing filters and format.</param>
+    /// <param name="now">The current time for resolving relative time specifications.</param>
     public static string BuildQueryString(AuditExportArgs args, DateTimeOffset now)
     {
         var parts = new List<string>();
@@ -79,6 +111,10 @@ public static class AuditExportHelpers
     /// A <c>501 Not Implemented</c> (parquet not yet supported server-side) prints the
     /// server message and returns a non-zero exit code.
     /// </summary>
+    /// <param name="client">The management HTTP client for API communication.</param>
+    /// <param name="args">The export arguments containing filters and output file path.</param>
+    /// <param name="output">Text writer for command output messages.</param>
+    /// <param name="now">The current time for resolving relative time specifications.</param>
     public static async Task<int> RunExportAsync(
         ManagementHttpClient client, AuditExportArgs args, TextWriter output, DateTimeOffset now)
     {