WP-10: contract and failing tests for OS and package inventory

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

backend/crates/infrastructure/src/lib.rs

@@ -1,6 +1,7 @@
 //! Infrastructure layer: SQLite repositories, Argon2 hashing, JWT issuing.
 pub mod cipher;
 pub mod db;
+pub mod host;
 pub mod mail;
 pub mod password;
 pub mod sqlite;
@@ -8,7 +9,9 @@ pub mod token;
 
 pub use cipher::AesGcmCipher;
 pub use db::{connect, DbPool};
+pub use host::{DebianInspector, FakeHostInspector, SystemCommandRunner};
 pub use mail::LettreMailer;
 pub use password::Argon2Hasher;
+pub use sqlite::SqliteInventory;
 pub use sqlite::{SqliteAuditLog, SqliteJobRuns, SqliteRefreshTokens, SqliteSettings, SqliteUsers};
 pub use token::JwtIssuer;