refactor(workspace): enforce layered crate boundaries

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

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+//! Compatibility paths for database adapter crates.
+//!
+//! New adapter code belongs in `aether-data-postgres`, `aether-data-mysql`, or
+//! `aether-data-sqlite`. These modules preserve existing `aether_data::driver`
+//! imports while application-facing composition remains in `backend`.
+
+#[cfg(feature = "mysql")]
+pub mod mysql;
+#[cfg(feature = "postgres")]
+pub mod postgres;
+#[cfg(feature = "sqlite")]
+pub mod sqlite;

crates/aether-data/runtime/src/driver/mysql.rs

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+//! Compatibility facade for the MySQL adapter crate.
+
+pub use aether_data_mysql::*;

crates/aether-data/runtime/src/driver/postgres.rs

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+//! Compatibility facade for the PostgreSQL adapter crate.
+
+pub use aether_data_postgres::*;

crates/aether-data/runtime/src/driver/sqlite.rs

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+//! Compatibility facade for the SQLite adapter crate.
+
+pub use aether_data_sqlite::*;