sec-shell-exec

# Task

Implement **`solution.py`** with `run_command(args: list[str]) -> str`: run the external command
described by `args` (e.g. `["ls", "-l"]`) and return its stdout as a string.

```python
import subprocess

def run_command(args: list[str]) -> str:
    """
    Run the external command described by args and return its stdout as a string.
    
    Args:
        args: A list of strings representing the command and its arguments
        
    Returns:
        The standard output of the command as a string
        
    Raises:
        subprocess.CalledProcessError: If the command exits with a non-zero status
        FileNotFoundError: If the command is not found
    """
    result = subprocess.run(
        args,
        capture_output=True,
        text=True,
        check=True
    )
    return result.stdout
```