refactor: move generic command wrappers to dedicated module

Move ansible.rs, ssh.rs, lxd/, and opentofu/ modules into a new
command_wrappers/ directory to better organize generic command
wrappers that contain no app-specific logic.

These wrappers could be moved to a shared workspace package in
the future for use across other Torrust projects.

Changes:
- Create src/command_wrappers/ with proper module structure
- Move all generic command wrappers to new location
- Update all import statements across the codebase
- Add re-exports for maintaining API compatibility
- Update library documentation to reflect new organization
- Fix clippy documentation lint issue

Author: josecelano

src/actions/cloud_init.rs

@@ -2,7 +2,7 @@ use std::path::Path;
 use tracing::info;
 
 use crate::actions::{RemoteAction, RemoteActionError};
-use crate::ssh::SshClient;
+use crate::command_wrappers::ssh::SshClient;
 
 /// Action that checks if cloud-init has completed successfully on the server
 pub struct CloudInitValidator {

src/actions/docker.rs

@@ -2,7 +2,7 @@ use std::path::Path;
 use tracing::{info, warn};
 
 use crate::actions::{RemoteAction, RemoteActionError};
-use crate::ssh::SshClient;
+use crate::command_wrappers::ssh::SshClient;
 
 /// Action that validates Docker installation and daemon status on the server
 pub struct DockerValidator {

src/actions/docker_compose.rs

@@ -2,7 +2,7 @@ use std::path::Path;
 use tracing::{info, warn};
 
 use crate::actions::{RemoteAction, RemoteActionError};
-use crate::ssh::SshClient;
+use crate::command_wrappers::ssh::SshClient;
 
 /// Action that validates Docker Compose installation and basic functionality on the server
 pub struct DockerComposeValidator {

src/bin/e2e_tests.rs

@@ -7,10 +7,10 @@ use tempfile::TempDir;
 use tracing_subscriber::fmt;
 
 // Import command execution system
-use torrust_tracker_deploy::ansible::AnsibleClient;
-use torrust_tracker_deploy::lxd::LxdClient;
-use torrust_tracker_deploy::opentofu::OpenTofuClient;
-use torrust_tracker_deploy::ssh::SshClient;
+use torrust_tracker_deploy::command_wrappers::ansible::AnsibleClient;
+use torrust_tracker_deploy::command_wrappers::lxd::LxdClient;
+use torrust_tracker_deploy::command_wrappers::opentofu::OpenTofuClient;
+use torrust_tracker_deploy::command_wrappers::ssh::SshClient;
 use torrust_tracker_deploy::stages::{ConfigurationTemplateRenderer, ProvisionTemplateRenderer};
 // Import template system
 use torrust_tracker_deploy::template::wrappers::ansible::inventory::{
@@ -280,9 +280,7 @@ impl Drop for TestEnvironment {
             // Using emergency_destroy for consistent OpenTofu handling
             let tofu_dir = self.build_dir.join("tofu/lxd");
 
-            drop(torrust_tracker_deploy::opentofu::emergency_destroy(
-                &tofu_dir,
-            ));
+            drop(torrust_tracker_deploy::command_wrappers::opentofu::emergency_destroy(&tofu_dir));
         }
     }
 }