colony-agent skeleton: worker, dream, birth, status commands (stubs)

Phase 2 crate scaffolded with clap CLI. All commands are stubs
that exit with "not yet implemented". Ready for implementation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/colony-agent/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "colony-agent"
+version = "0.1.0"
+edition = "2021"
+
+[[bin]]
+name = "colony-agent"
+path = "src/main.rs"
+
+[dependencies]
+colony-types = { path = "../colony-types" }
+clap = { version = "4", features = ["derive"] }
+reqwest = { version = "0.12", features = ["json", "rustls-tls"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+tokio = { version = "1", features = ["full"] }
+toml = "0.8"