//! Development auth helper — reads token from environment with fallback.
//!
//! Used by daemon-internal HTTP calls (doctor checks, plan executor, etc.)
//! to avoid hard-coding auth tokens in source code.
/// Build the `Authorization` header value for internal daemon calls.
///
/// Reads `CONVERGIO_AUTH_TOKEN` from the environment; falls back to
/// `"dev-local"` when the variable is unset (local development only).