style: add YAML document start markers to Ansible playbooks and tasks

bin/helpers/functions.py

@@ -115,6 +115,11 @@ def run_command(command, shell=False):
     except FileNotFoundError:
         return False, f"Command '{command[0]}' not found"
 
+def command_exists(command):
+    """Check if a command exists in the PATH"""
+    import shutil
+    return shutil.which(command) is not None
+
 def ensure_dependencies():
     """Check and install required dependencies for the dotfiles system"""
     required_packages = [