Enhance command execution with improved concurrency and documentation updates. Refined the CommandTaskContext structure for better task management and clarified usage instructions for 'memtest' and 'tasktest' commands in README.md.

commands.h

@@ -9,6 +9,7 @@
 #define COMMANDS_H
 
 #include "boot_info.h"
+#include "task.h"
 
 /* Handler function signature: receives BootInfo and any argument text. */
 typedef void (*CommandHandlerFn)(BootInfo *Boot, CHAR16 *Args);
@@ -26,8 +27,13 @@ typedef struct {
     CommandHandlerFn handler;       /* function that executes the cmd   */
 } Command;
 
-/* Parse and dispatch a line of user input. */
-void execute_command(BootInfo *Boot, CHAR16 *Input);
+/* Parse and dispatch a line of user input.
+ *
+ * Returns:
+ *   - Pointer to a Task representing the spawned command process,
+ *     or NULL if the command was not found or ran synchronously.
+ */
+Task *execute_command(BootInfo *Boot, CHAR16 *Input);
 
 /* Print a formatted list of all registered commands. */
 void show_help(BootInfo *Boot);