Refactor sleep function for FreeRTOS; replace no-op definition with vTaskDelay for better task management

core/include/nova64_internal.h

@@ -16,7 +16,9 @@ void nova64_log_scheduler_state(void);
 #include <unistd.h>
 #define nova64_host_sleep_ms(ms) usleep((ms) * 1000)
 #else
-#define nova64_host_sleep_ms(ms) ((void)0)
+#include "FreeRTOS.h"
+#include "task.h"
+#define nova64_host_sleep_ms(ms) vTaskDelay(pdMS_TO_TICKS(ms))
 #endif
 
 #endif // NOVA64_INTERNAL_H

core/src/nova64_core.c

@@ -6,7 +6,6 @@
 #include "wasm_runner.h"
 #include <stdarg.h>
 #include <stdio.h>
-#include <stdlib.h>
 
 #if defined(ESP_PLATFORM)
 #include "esp_pm.h"