refactor(workspace): enforce layered crate boundaries

crates/aether-runtime/state/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "aether-runtime-state"
+version = "0.1.0"
+edition.workspace = true
+license.workspace = true
+repository.workspace = true
+description = "Runtime state backends for Aether services"
+
+[dependencies]
+aether-cache.workspace = true
+aether-data-contracts.workspace = true
+aether-runtime.workspace = true
+async-trait.workspace = true
+redis.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+thiserror.workspace = true
+tokio.workspace = true
+tracing.workspace = true
+url.workspace = true
+uuid.workspace = true