//! FalseGreen client shim.
//!
//! This crate provides the `falsegreen` binary — a tiny Rust CLI that:
//! - bridges STDIO MCP to the FalseGreen verification engine
//! - manages authentication credentials
//! - installs itself into agent configurations (Codex)
//!
//! The actual verification logic lives server-side.
//! This shim is intentionally boring.