Add App core struct with event-handling and initialization logic for TUI.

crates/owlen-core/Cargo.toml

@@ -0,0 +1,22 @@
+[package]
+name = "owlen-core"
+version = "0.1.0"
+edition = "2021"
+description = "Core traits and types for OWLEN LLM client"
+
+[dependencies]
+serde = { workspace = true }
+serde_json = { workspace = true }
+uuid = { workspace = true }
+anyhow = { workspace = true }
+thiserror = { workspace = true }
+tokio = { workspace = true }
+futures = { workspace = true }
+tokio-stream = { workspace = true }
+async-trait = "0.1"
+textwrap = { workspace = true }
+toml = { workspace = true }
+shellexpand = { workspace = true }
+
+[dev-dependencies]
+tokio-test = { workspace = true }