Phase 1: project scaffold, clap CLI, self-re-exec daemon, NDJSON IPC

- Cargo.toml with clap, tokio, serde, anyhow dependencies
- Entry point with env-var routing to daemon or CLI mode
- Core protocol types (Request/Response NDJSON wire format)
- Session detection (X11 check with DISPLAY/XDG_SESSION_TYPE)
- RefMap with @wN selector resolution (direct, prefix, substring)
- Snapshot/WindowInfo shared types with Display impl
- clap derive CLI with all subcommands (snapshot, click, type, etc.)
- Client connection: socket path resolution, daemon auto-start via
  self-re-exec, NDJSON send/receive with retry backoff
- Tokio async daemon: Unix socket listener, accept loop, graceful
  shutdown via notify
- DaemonState holding session info and ref map
- Placeholder handler returning hardcoded snapshot response

Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "desktop-ctl"
+version = "0.1.0"
+edition = "2021"
+description = "Desktop control CLI for AI agents - screenshot, click, type, window management on Linux X11"
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/user/agent-computer"
+
+[dependencies]
+clap = { version = "4", features = ["derive", "env"] }
+tokio = { version = "1", features = ["full"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+anyhow = "1"
+dirs = "6"
+libc = "0.2"
+uuid = { version = "1", features = ["v4"] }