refactor: [#220] update infrastructure exports for external validators

Author: josecelano

src/infrastructure/mod.rs

@@ -11,10 +11,12 @@
 //!   - `docker_compose` - Docker Compose template generation
 //!   - `tofu` - `OpenTofu` template generation and project structure
 //!   - `tracker` - Torrust Tracker configuration templates
-//! - `remote_actions` - Repository-like implementations for remote system operations
+//! - `remote_actions` - SSH-based operations executed inside VMs
+//! - `external_validators` - E2E validation from outside VMs (HTTP health checks)
 //! - `persistence` - Persistence infrastructure (repositories, file locking, storage)
 //! - `trace` - Trace file generation for error analysis
 
+pub mod external_validators;
 pub mod persistence;
 pub mod remote_actions;
 pub mod templating;

src/infrastructure/remote_actions/mod.rs

@@ -4,6 +4,15 @@
 //! containing leaf-level actions that directly interact with remote systems via SSH.
 //! These actions are the building blocks used by steps (Level 2) and commands (Level 1).
 //!
+//! ## Execution Context: Inside VM via SSH
+//!
+//! All remote actions in this module execute commands **INSIDE the VM via SSH**.
+//! For external validation (E2E testing from outside the VM), see `external_validators/`.
+//!
+//! **Distinction**:
+//! - **remote_actions** (this module): Execute commands inside VM via SSH
+//! - **external_validators**: Validate services from outside VM via HTTP
+//!
 //! ## Available Remote Actions
 //!
 //! - `validators::cloud_init` - Cloud-init status checking and validation
@@ -31,7 +40,6 @@ pub mod validators;
 pub use validators::cloud_init::CloudInitValidator;
 pub use validators::docker::DockerValidator;
 pub use validators::docker_compose::DockerComposeValidator;
-pub use validators::running_services::RunningServicesValidator;
 
 /// Errors that can occur during remote action execution
 #[derive(Error, Debug)]

src/infrastructure/remote_actions/validators/mod.rs

@@ -1,9 +1,7 @@
 pub mod cloud_init;
 pub mod docker;
 pub mod docker_compose;
-pub mod running_services;
 
 pub use cloud_init::CloudInitValidator;
 pub use docker::DockerValidator;
 pub use docker_compose::DockerComposeValidator;
-pub use running_services::RunningServicesValidator;