feat: cleanup init code, small other refactors

kernel/command.c

@@ -25,6 +25,7 @@
 #include <myke/debug/debug.h>
 #include <myke/util/slingurl.h>
 #include <myke/libk/syscall.h>
+#include <myke/util/init.h>
 
 #endif
 
@@ -223,3 +224,15 @@ void att_noreturn main_loop(void *data) {
         free(msg);
     }
 }
+
+#ifdef K_SHELL
+void main_loop_start() {
+    task_spawn(main_loop, NULL, "main");
+}
+
+INIT_FUNCTION(100) = {
+        .name = "main-task",
+        .stage = INIT_STAGE_PRE_TASKING,
+        .init = main_loop_start,
+};
+#endif