refactor(workspace): enforce layered crate boundaries

crates/aether-data/runtime/src/lifecycle/mod.rs

@@ -0,0 +1,10 @@
+//! Database lifecycle workflows.
+//!
+//! Runtime request paths should not depend on this module directly except at
+//! process startup or explicit maintenance/export commands.
+
+pub mod backfill;
+#[cfg(feature = "postgres")]
+pub(crate) mod bootstrap;
+pub mod export;
+pub mod migrate;