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.StoreAndForward/StoreAndForwardStorage.cs

@@ -27,6 +27,11 @@ public class StoreAndForwardStorage
     private readonly string _connectionString;
     private readonly ILogger<StoreAndForwardStorage> _logger;
 
+    /// <summary>
+    /// Initializes a new instance of <see cref="StoreAndForwardStorage"/> with the given SQLite connection string.
+    /// </summary>
+    /// <param name="connectionString">SQLite connection string for the store-and-forward database.</param>
+    /// <param name="logger">Logger for diagnostics.</param>
     public StoreAndForwardStorage(string connectionString, ILogger<StoreAndForwardStorage> logger)
     {
         _connectionString = connectionString;
@@ -139,6 +144,7 @@ public class StoreAndForwardStorage
     /// <summary>
     /// WP-9: Enqueues a new message with Pending status.
     /// </summary>
+    /// <param name="message">The message to enqueue.</param>
     public async Task EnqueueAsync(StoreAndForwardMessage message)
     {
         await using var connection = new SqliteConnection(_connectionString);
@@ -209,6 +215,7 @@ public class StoreAndForwardStorage
     /// <summary>
     /// WP-10: Updates a message after a delivery attempt.
     /// </summary>
+    /// <param name="message">The message with updated retry count, status, and last error.</param>
     public async Task UpdateMessageAsync(StoreAndForwardMessage message)
     {
         await using var connection = new SqliteConnection(_connectionString);
@@ -246,6 +253,8 @@ public class StoreAndForwardStorage
     /// the status the sweep observed closes the sweep-vs-management race rather than
     /// relying only on the in-process overlapping-sweep guard.
     /// </summary>
+    /// <param name="message">The message with the updated values to persist.</param>
+    /// <param name="expectedStatus">The status the row must currently have for the update to proceed.</param>
     public async Task<bool> UpdateMessageIfStatusAsync(
         StoreAndForwardMessage message,
         StoreAndForwardMessageStatus expectedStatus)
@@ -277,6 +286,7 @@ public class StoreAndForwardStorage
     /// <summary>
     /// WP-10: Removes a successfully delivered message.
     /// </summary>
+    /// <param name="messageId">The id of the message to remove.</param>
     public async Task RemoveMessageAsync(string messageId)
     {
         await using var connection = new SqliteConnection(_connectionString);
@@ -298,6 +308,9 @@ public class StoreAndForwardStorage
     /// inconsistent with the returned page (flickering totals / off-by-one page math
     /// in the paginated UI).
     /// </summary>
+    /// <param name="category">Optional category filter; null returns parked messages from all categories.</param>
+    /// <param name="pageNumber">1-based page number.</param>
+    /// <param name="pageSize">Maximum number of messages to return per page.</param>
     public async Task<(List<StoreAndForwardMessage> Messages, int TotalCount)> GetParkedMessagesAsync(
         StoreAndForwardCategory? category = null,
         int pageNumber = 1,
@@ -352,6 +365,7 @@ public class StoreAndForwardStorage
     /// interval relative to the original (pre-park) attempt — "try immediately" only
     /// by accident, and a long interval would instead delay the operator's retry.
     /// </summary>
+    /// <param name="messageId">The id of the parked message to move back to Pending.</param>
     public async Task<bool> RetryParkedMessageAsync(string messageId)
     {
         await using var connection = new SqliteConnection(_connectionString);
@@ -374,6 +388,7 @@ public class StoreAndForwardStorage
     /// <summary>
     /// WP-12: Permanently discards a parked message.
     /// </summary>
+    /// <param name="messageId">The id of the parked message to discard.</param>
     public async Task<bool> DiscardParkedMessageAsync(string messageId)
     {
         await using var connection = new SqliteConnection(_connectionString);
@@ -420,6 +435,7 @@ public class StoreAndForwardStorage
     /// WP-13: Verifies messages are NOT deleted when an instance is deleted.
     /// Returns the count of messages for a given origin instance.
     /// </summary>
+    /// <param name="instanceName">The origin instance name to count messages for.</param>
     public async Task<int> GetMessageCountByOriginInstanceAsync(string instanceName)
     {
         await using var connection = new SqliteConnection(_connectionString);
@@ -438,6 +454,7 @@ public class StoreAndForwardStorage
     /// <summary>
     /// Gets a message by ID.
     /// </summary>
+    /// <param name="messageId">The id of the message to retrieve.</param>
     public async Task<StoreAndForwardMessage?> GetMessageByIdAsync(string messageId)
     {
         await using var connection = new SqliteConnection(_connectionString);
@@ -473,6 +490,7 @@ public class StoreAndForwardStorage
     /// <summary>
     /// Gets total message count by status.
     /// </summary>
+    /// <param name="status">The status to filter by.</param>
     public async Task<int> GetMessageCountByStatusAsync(StoreAndForwardMessageStatus status)
     {
         await using var connection = new SqliteConnection(_connectionString);