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/AuditQueryHelpers.cs

@@ -15,18 +15,31 @@ namespace ScadaLink.CLI.Commands;
 /// </summary>
 public sealed class AuditQueryArgs
 {
+    /// <summary>Start time spec (relative like 1h, or absolute ISO-8601).</summary>
     public string? Since { get; set; }
+    /// <summary>End time spec (relative like 7d, or absolute ISO-8601).</summary>
     public string? Until { get; set; }
+    /// <summary>Multi-valued channel filter.</summary>
     public string[] Channel { get; set; } = Array.Empty<string>();
+    /// <summary>Multi-valued audit event kind filter.</summary>
     public string[] Kind { get; set; } = Array.Empty<string>();
+    /// <summary>Multi-valued status filter.</summary>
     public string[] Status { get; set; } = Array.Empty<string>();
+    /// <summary>Multi-valued site ID filter.</summary>
     public string[] Site { get; set; } = Array.Empty<string>();
+    /// <summary>Target system or service filter.</summary>
     public string? Target { get; set; }
+    /// <summary>Actor (user or system) filter.</summary>
     public string? Actor { get; set; }
+    /// <summary>Operation correlation ID filter.</summary>
     public string? CorrelationId { get; set; }
+    /// <summary>Script execution ID filter.</summary>
     public string? ExecutionId { get; set; }
+    /// <summary>Parent execution ID filter.</summary>
     public string? ParentExecutionId { get; set; }
+    /// <summary>Filter for errors only (status=Failed).</summary>
     public bool ErrorsOnly { get; set; }
+    /// <summary>Page size for pagination.</summary>
     public int PageSize { get; set; } = 100;
 }
 
@@ -45,6 +58,8 @@ public static class AuditQueryHelpers
     /// relative offset (<c>30s</c>, <c>15m</c>, <c>1h</c>, <c>7d</c>) interpreted as
     /// <paramref name="now"/> minus the offset, or an absolute ISO-8601 timestamp.
     /// </summary>
+    /// <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>
     public static DateTimeOffset ResolveTimeSpec(string spec, DateTimeOffset now)
     {
@@ -84,6 +99,10 @@ public static class AuditQueryHelpers
     /// server's multi-value <c>IN (…)</c> filter receives the full set. <c>--errors-only</c>
     /// maps to a single <c>status=Failed</c> and overrides any explicit <c>--status</c>.
     /// </summary>
+    /// <param name="args">The audit query arguments.</param>
+    /// <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>
     public static string BuildQueryString(
         AuditQueryArgs args, DateTimeOffset now, DateTimeOffset? afterOccurredAtUtc, string? afterEventId)
     {
@@ -144,6 +163,12 @@ public static class AuditQueryHelpers
     /// follows <c>nextCursor</c> until the server returns a null cursor. Returns the
     /// process exit code (0 success, non-zero on HTTP/transport error).
     /// </summary>
+    /// <param name="client">The management HTTP client.</param>
+    /// <param name="args">The audit query arguments.</param>
+    /// <param name="fetchAll">Whether to follow pagination cursors.</param>
+    /// <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>
     public static async Task<int> RunQueryAsync(
         ManagementHttpClient client,
         AuditQueryArgs args,