Full decommission path for an EC2 host: terminate the instance and clean up local operational state that refers to it.
awsdecomhost.py <name> [--yes] [--region REGION]
Requests EC2 termination when the instance still exists.
Uses the UDP daemon to disable the host entry and save the updated hosts file.
Removes the host from ~/ansible/hosts.ini, prunes SSH known_hosts entries, deletes ~/.ssh/<name>.pem, and calls update_hosts_note.py terminate <name>.
Leaves AWS key-pair deletion as a manual follow-up and prints the corresponding AWS CLI command.