fix(stdio): restore 2s socket-release wait to prevent Windows port leak (#1173)

MCPForUnity/Editor/Services/StdioBridgeReloadHandler.cs

@@ -70,7 +70,9 @@ private static void OnBeforeAssemblyReload()
                     // Stop only stdio before reload. This is centralized here so resume-flag updates
                     // and teardown cannot race each other via separate beforeAssemblyReload handlers.
                     var stopTask = MCPServiceLocator.TransportManager.StopAsync(TransportMode.Stdio);
-                    try { stopTask.Wait(500); } catch { }
+                    // Match StdioBridgeHost.Stop's 2s socket-release wait; 500ms is too short on
+                    // Windows and lets the next reload bind the same port before the OS frees it.
+                    try { stopTask.Wait(2000); } catch { }
 
                     // Legacy safety: stdio may have been started outside TransportManager state.
                     try { StdioBridgeHost.Stop(); } catch { }

MCPForUnity/Editor/Services/Transport/Transports/StdioBridgeHost.cs

@@ -396,8 +396,10 @@ public static void Stop()
 
             if (toWait != null)
             {
-                // CTS is already cancelled; give the listener task a brief moment to exit.
-                try { toWait.Wait(500); } catch { }
+                // Windows needs the full 2s for the socket to release after Dispose; with 500ms
+                // the next Start() can hit AddressAlreadyInUse and silently fall back to a new
+                // port, orphaning the listener. See #1173 / #688.
+                try { toWait.Wait(2000); } catch { }
             }
 
             // ProcessCommands stays permanently hooked (guarded by _processCommandsHooked)