Add delay in uart_handle_read() to prevent tight polling loop and memory leaks

Added Sleep(1) to uart_handle_read when no data is available to simulate
hardware I/O latency. This prevents the hook from entering a tight polling
loop, which was causing high CPU usage and massive memory leaks.

hooklib/uart.c

@@ -200,6 +200,9 @@ static HRESULT uart_handle_read(struct uart *uart, struct irp *irp)
     int requested = irp->read.nbytes;
 
     if (uart->readable.pos < requested && uart->readable.pos == 0) {
+        /* Avoid a tight polling loop which causes performance issues 
+           and massive memory leaks. Simulate hardware I/O latency. */
+        Sleep(1);
         return E_PENDING;
     }