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.SiteRuntime/Tracking/OperationTrackingStore.cs

@@ -41,6 +41,11 @@ public class OperationTrackingStore : IOperationTrackingStore, IAsyncDisposable,
     private readonly ILogger<OperationTrackingStore> _logger;
     private bool _disposed;
 
+    /// <summary>
+    /// Initializes the tracking store, opens the SQLite connection, and applies the schema.
+    /// </summary>
+    /// <param name="options">Tracking store configuration (connection string, retention window).</param>
+    /// <param name="logger">Logger for diagnostics.</param>
     public OperationTrackingStore(
         IOptions<OperationTrackingOptions> options,
         ILogger<OperationTrackingStore> logger)
@@ -351,12 +356,14 @@ public class OperationTrackingStore : IOperationTrackingStore, IAsyncDisposable,
             DateTimeStyles.RoundtripKind);
     }
 
+    /// <summary>Synchronously disposes the tracking store and its SQLite connection.</summary>
     public void Dispose()
     {
         DisposeAsyncCore().AsTask().GetAwaiter().GetResult();
         GC.SuppressFinalize(this);
     }
 
+    /// <summary>Asynchronously disposes the tracking store and its SQLite connection.</summary>
     public async ValueTask DisposeAsync()
     {
         await DisposeAsyncCore().ConfigureAwait(false);