refactor(workspace): enforce layered crate boundaries

crates/aether-data/contracts/src/repository/video_tasks/mod.rs

@@ -0,0 +1,7 @@
+mod types;
+
+pub use types::{
+    StoredVideoTask, UpsertVideoTask, VideoTaskLookupKey, VideoTaskModelCount,
+    VideoTaskQueryFilter, VideoTaskReadRepository, VideoTaskRepository, VideoTaskStatus,
+    VideoTaskStatusCount, VideoTaskWriteRepository,
+};