Add XML documentation across gateway, worker, and .NET client

src/MxGateway.Server/Sessions/SessionManager.cs

@@ -25,6 +25,15 @@ public sealed class SessionManager : ISessionManager
     private readonly GatewayOptions _options;
     private readonly SemaphoreSlim _sessionSlots;
 
+    /// <summary>
+    /// Initializes a new instance of <see cref="SessionManager"/>.
+    /// </summary>
+    /// <param name="registry">Session registry.</param>
+    /// <param name="workerClientFactory">Worker client factory.</param>
+    /// <param name="options">Gateway options.</param>
+    /// <param name="metrics">Gateway metrics.</param>
+    /// <param name="timeProvider">Time provider for timestamps.</param>
+    /// <param name="logger">Logger.</param>
     public SessionManager(
         ISessionRegistry registry,
         ISessionWorkerClientFactory workerClientFactory,
@@ -43,6 +52,13 @@ public sealed class SessionManager : ISessionManager
         _sessionSlots = new SemaphoreSlim(_options.Sessions.MaxSessions, _options.Sessions.MaxSessions);
     }
 
+    /// <summary>
+    /// Opens a new gateway session and connects to the worker.
+    /// </summary>
+    /// <param name="request">Session open request.</param>
+    /// <param name="clientIdentity">Client authentication identity.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>Opened gateway session.</returns>
     public async Task<GatewaySession> OpenSessionAsync(
         SessionOpenRequest request,
         string? clientIdentity,
@@ -96,6 +112,12 @@ public sealed class SessionManager : ISessionManager
         }
     }
 
+    /// <summary>
+    /// Attempts to retrieve a session by ID.
+    /// </summary>
+    /// <param name="sessionId">Session identifier.</param>
+    /// <param name="session">The session if found.</param>
+    /// <returns>True if session found; otherwise false.</returns>
     public bool TryGetSession(
         string sessionId,
         out GatewaySession session)
@@ -103,6 +125,13 @@ public sealed class SessionManager : ISessionManager
         return _registry.TryGet(sessionId, out session);
     }
 
+    /// <summary>
+    /// Invokes a worker command on a session asynchronously.
+    /// </summary>
+    /// <param name="sessionId">Session identifier.</param>
+    /// <param name="command">Worker command.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>Command reply.</returns>
     public async Task<WorkerCommandReply> InvokeAsync(
         string sessionId,
         WorkerCommand command,
@@ -129,6 +158,12 @@ public sealed class SessionManager : ISessionManager
         }
     }
 
+    /// <summary>
+    /// Reads events from a session's event stream asynchronously.
+    /// </summary>
+    /// <param name="sessionId">Session identifier.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>Async enumerable of worker events.</returns>
     public IAsyncEnumerable<WorkerEvent> ReadEventsAsync(
         string sessionId,
         CancellationToken cancellationToken)
@@ -138,6 +173,12 @@ public sealed class SessionManager : ISessionManager
         return session.ReadEventsAsync(cancellationToken);
     }
 
+    /// <summary>
+    /// Closes a gateway session asynchronously.
+    /// </summary>
+    /// <param name="sessionId">Session identifier.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>Session close result.</returns>
     public async Task<SessionCloseResult> CloseSessionAsync(
         string sessionId,
         CancellationToken cancellationToken)
@@ -151,6 +192,12 @@ public sealed class SessionManager : ISessionManager
         return result;
     }
 
+    /// <summary>
+    /// Closes all sessions with expired leases asynchronously.
+    /// </summary>
+    /// <param name="now">Current time for lease expiration check.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>Count of sessions closed.</returns>
     public async Task<int> CloseExpiredLeasesAsync(
         DateTimeOffset now,
         CancellationToken cancellationToken)
@@ -170,6 +217,11 @@ public sealed class SessionManager : ISessionManager
         return closedCount;
     }
 
+    /// <summary>
+    /// Shuts down all active sessions gracefully asynchronously.
+    /// </summary>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>Completed task.</returns>
     public async Task ShutdownAsync(CancellationToken cancellationToken)
     {
         foreach (GatewaySession session in _registry.Snapshot())