fix: even more closing of M0/M1/M2 gaps against the spec

crates/bds-core/src/engine/mod.rs

@@ -14,6 +14,9 @@ pub mod rebuild;
 pub mod search;
 pub mod calendar;
 pub mod validate_translations;
+pub mod validate_media;
+pub mod validate_content;
+pub mod menu;
 
 pub use error::{EngineError, EngineResult};
 pub use context::EngineContext;