## MODIFIED Requirements

### Requirement: Ansible inventory defines relay and landing server groups
The inventory SHALL define two host groups: `relay` and `landing`, each containing the respective server's connection details (IP, SSH user, SSH key). The `ansible_user` SHALL be a configurable placeholder supporting both root and non-root users. The repository SHALL ship `inventory/hosts.yml.example` as a template; the actual `inventory/hosts.yml` SHALL be gitignored and created by the user.

#### Scenario: Inventory is valid
- **WHEN** the user copies `hosts.yml.example` to `hosts.yml` and fills in their values
- **THEN** two groups `relay` and `landing` are available, each with at least one host

#### Scenario: Non-root user with sudo
- **WHEN** `ansible_user` is set to a non-root user (e.g., `ubuntu`)
- **THEN** Ansible connects as that user and uses `become` for privilege escalation

#### Scenario: Root user
- **WHEN** `ansible_user` is set to `root`
- **THEN** Ansible connects as root directly and `become` is a no-op

#### Scenario: Missing inventory
- **WHEN** the user has not copied `hosts.yml.example` to `hosts.yml`
- **THEN** Ansible fails with an error indicating the inventory file is missing